Articles de revues : « Seaweed-based extract »

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Godlewska, Katarzyna, Izabela Michalak, Łukasz Tuhy et Katarzyna Chojnacka. « Plant Growth Biostimulants Based on Different Methods of Seaweed Extraction with Water ». BioMed Research International 2016 (2016) : 1–11. http://dx.doi.org/10.1155/2016/5973760.

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We explored two methods for obtaining aqueous extracts: boiling and soaking of Baltic seaweeds (EB and ES, resp.). Algal extracts were characterized in terms of polyphenols, micro- and macroelements, lipids content, and antibacterial properties. The utilitarian properties were examined in the germination tests onLepidium sativumfor three extract dilutions (0.5, 2.5, and 10%). It was found that the extracts were similar in micro- and macroelement concentrations. Water was proved to be a good solvent to extract phenolic compounds. The algal extract produced by soaking biomass did not show inhibitory effect onEscherichia coliandStaphylococcus aureus. Only the boiled extract had an inhibitory activity againstE. coli. Germination tests revealed a positive influence of the bioproducts on the cultivated plants. In the group treated with 10% EB, plants were 13% longer than in the control group; the content of elements B, Mo, Zn, and Na in the group treated with 10% ES was higher by 76%, 48%, 31%, and 59% than in the control group, respectively; the content of chlorophyll was 2.5 times higher in 0.5% ES than in the control group. Extracts showed the slight impact on the morphology of plants.

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Dwi Kurniasari, Kartika, Ade Arsianti, Yully Astika Nugrahayning Aziza, Baiq Kirana Dyahningrum Mandasari, Riathul Masita, Futihati Ruhama Zulfa, Micheylla Kusumaning Dewi, Cut Raisya Zahira Zagloel, Norma Nur Azizah et Rista Putrianingsih. « Phytochemical Analysis and Anticancer Activity of Seaweed Gracilaria verrucosa against Colorectal HCT-116 Cells ». Oriental Journal of Chemistry 34, n^o 3 (4 juin 2018) : 1257–62. http://dx.doi.org/10.13005/ojc/340308.

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In this research, we develop Indonesia marine resource of seaweed Gracilaria verrucosa as an anti-colorectal cancer agent. Seaweed Gracilaria verrucosa which was collected from east Lombok beach, Nusa Tenggara Barat, Indonesia, were extracted into four different organic solvents, that is n-hexane, ethylacetate, chloroform and ethanol. The extracts were analyzed by Phytochemical test and Thin Layer Chromatography (TLC). Subsequently, anticancer activity of n-hexane, ethyl acetate, chloroform and ethanol extracts of Gracilaria verrucosa were evaluated against colorectal HCT-116 cells by MTT cell proliferation assay. Based on Phytochemical analysis, the extracts of Gracilaria verrucosa containing secondary metabolite of saponin, while TLC analysis indicated that the extracts were composed by five chemical compounds. Among four concentrated extracts of Gracilariaverrucosa, ethanolic extract showed the strongest anticancer activity against colorectal HCT-116 cells with IC50 of 43.9 μg/mL.Ethanolic extract of seaweed Gracilaria verrucosa is potential to be further developed as a promising anti-colorectal cancer agents.

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Fitriyah, Fauziatul, Muhammad Abdul Aziz, Sri Wahyuni, Hana Fadila, Insyiah Meida Luktyansyah, Sulastri Sulastri, Priyono Priyono et Siswanto Siswanto. « Biostimulant Activity of Sargassum ; sp. Extracts on Early Growth of Zea mays ; L. and the Phytohormones Content Analysis ». Journal of Tropical Biodiversity and Biotechnology 7, n^o 2 (20 juin 2022) : 69178. http://dx.doi.org/10.22146/jtbb.69178.

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Seaweed has been gaining global interest in agriculture for the development of marine-based plant biostimulants. This research aimed to study the effect of three different liquid extracts of Sargassum sp., acidic, alkaline, and water extract, on the germination and early growth of maize and to evaluate the phytohormones content responsible for the growth. Phytohormones content including Indole-3-acetic acid (IAA), gibberellins (GA), kinetin and zeatin were analyzed using high-performance liquid chromatography (HPLC) and bioassay was performed twice on maize. Parameters observed on the bioassay were germination percentage, number of roots, shoot length, shoot weight and root weight under 4 different concentrations with 0.5; 1.5; 3.5; and 5% in the first bioassay and 3.5% concentration in the second bioassay. Both bioassays following randomized complete design and the data were analyzed using one-way ANOVA using post hoc test of Duncan Multiple Range Test (DMRT) at error probability of 5% in Genestat software. Phytohormones content in the seaweed extract indicated that alkaline extract was rich in IAA, gibberellin, and zeatin content, while water extract showed the highest kinetin content. The first bioassay indicated that lower concentration of the seaweed extracts gave better growth in all extracts, therefore a 3.5% concentration was chosen for the second bioassay with higher replication for each treatment. The second bioassay confirmed alkaline extract resulted in the highest germination while the highest seedling height, number of roots, shoot and root weight were resulted from acidic extract treatment. In conclusion, Sargassum sp. extracts obtained from acidic, alkaline, and water-based extraction methods, were able to improve the shoot and root growth of maize plants. The acidic extract showed the highest growth promotion among other extracts with the lowest phytohormones content.

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Tinte, Morena M., Keabetswe Masike, Paul A. Steenkamp, Johan Huyser, Justin J. J. van der Hooft et Fidele Tugizimana. « Computational Metabolomics Tools Reveal Metabolic Reconfigurations Underlying the Effects of Biostimulant Seaweed Extracts on Maize Plants under Drought Stress Conditions ». Metabolites 12, n^o 6 (27 mai 2022) : 487. http://dx.doi.org/10.3390/metabo12060487.

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Drought is one of the major abiotic stresses causing severe damage and losses in economically important crops worldwide. Drought decreases the plant water status, leading to a disruptive metabolic reprogramming that negatively affects plant growth and yield. Seaweed extract-based biostimulants show potential as a sustainable strategy for improved crop health and stress resilience. However, cellular, biochemical, and molecular mechanisms governing the agronomically observed benefits of the seaweed extracts on plants are still poorly understood. In this study, a liquid chromatography–mass spectrometry-based untargeted metabolomics approach combined with computational metabolomics strategies was applied to unravel the molecular ‘stamps’ that define the effects of seaweed extracts on greenhouse-grown maize (Zea mays) under drought conditions. We applied mass spectral networking, substructure discovery, chemometrics, and metabolic pathway analyses to mine and interpret the generated mass spectral data. The results showed that the application of seaweed extracts induced alterations in the different pathways of primary and secondary metabolism, such as phenylpropanoid, flavonoid biosynthesis, fatty acid metabolism, and amino acids pathways. These metabolic changes involved increasing levels of phenylalanine, tryptophan, coumaroylquinic acid, and linolenic acid metabolites. These metabolic alterations are known to define some of the various biochemical and physiological events that lead to enhanced drought resistance traits. The latter include root growth, alleviation of oxidative stress, improved water, and nutrient uptake. Moreover, this study demonstrates the use of molecular networking in annotating maize metabolome. Furthermore, the results reveal that seaweed extract-based biostimulants induced a remodeling of maize metabolism, subsequently readjusting the plant towards stress alleviation, for example, by increasing the plant height and diameter through foliar application. Such insights add to ongoing efforts in elucidating the modes of action of biostimulants, such as seaweed extracts. Altogether, our study contributes to the fundamental scientific knowledge that is necessary for the development of a biostimulants industry aiming for a sustainable food security.

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EL Boukhari, Mohammed EL Mehdi, Mustapha Barakate, Youness Bouhia et Karim Lyamlouli. « Trends in Seaweed Extract Based Biostimulants : Manufacturing Process and Beneficial Effect on Soil-Plant Systems ». Plants 9, n^o 3 (12 mars 2020) : 359. http://dx.doi.org/10.3390/plants9030359.

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The time when plant biostimulants were considered as “snake oil” is erstwhile and the skepticism regarding their agricultural benefits has significantly faded, as solid scientific evidences of their positive effects are continuously provided. Currently plant biostimulants are considered as a full-fledged class of agri-inputs and highly attractive business opportunity for major actors of the agroindustry. As the dominant category of the biostimulant segment, seaweed extracts were key in this growing renown. They are widely known as substances with the function of mitigating abiotic stress and enhancing plant productivity. Seaweed extracts are derived from the extraction of several macroalgae species, which depending on the extraction methodology lead to the production of complex mixtures of biologically active compounds. Consequently, plant responses are often inconsistent, and precisely deciphering the involved mechanism of action remains highly intricate. Recently, scientists all over the world have been interested to exploring hidden mechanism of action of these resources through the employment of multidisciplinary and high-throughput approaches, combining plant physiology, molecular biology, agronomy, and multi-omics techniques. The aim of this review is to provide fresh insights into the concept of seaweed extract (SE), through addressing the subject in newfangled standpoints based on current scientific knowledge, and taking into consideration both academic and industrial claims in concomitance with market’s requirements. The crucial extraction process as well as the effect of such products on nutrient uptake and their role in abiotic and biotic stress tolerance are scrutinized with emphasizing the involved mechanisms at the metabolic and genetic level. Additionally, some often overlooked and indirect effects of seaweed extracts, such as their influence on plant microbiome are discussed. Finally, the plausible impact of the recently approved plant biostimulant regulation on seaweed extract industry is addressed.

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Erpel, Fernanda, María Salomé Mariotti-Celis, Javier Parada, Franco Pedreschi et José Ricardo Pérez-Correa. « Pressurized Hot Liquid Extraction with 15% v/v Glycerol-Water as An Effective Environment-Friendly Process to Obtain Durvillaea incurvata and Lessonia spicata Phlorotannin Extracts with Antioxidant and Antihyperglycemic Potential ». Antioxidants 10, n^o 7 (10 juillet 2021) : 1105. http://dx.doi.org/10.3390/antiox10071105.

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Brown seaweed phlorotannins have shown the potential to promote several health benefits. Durvillaea incurvata and Lessonia spicata—species that are widely distributed in central and southern Chile—were investigated to obtain phlorotannin extracts with antioxidant and antihyperglycemic potential. The use of an environmentally friendly and food-grade glycerol-based pressurized hot liquid extraction (PHLE) process (15% v/v glycerol water) was assessed for the first time to obtain phlorotannins. Multiple effects were analyzed, including the effect of the species, harvesting area (Las Cruces and Niebla), and anatomical part (holdfast, stipe, and frond) on the extracts’ polyphenol content (TPC), antioxidant capacity (AC), and carbohydrate-hydrolyzing enzyme—α-glucosidase and α-amylase—inhibitory activity. Contaminants, such as mannitol, heavy metals (As, Cd, Pb, Hg, and Sn), and 5-hydroxymethylfurfural (HMF), were also determined. The anatomical part used demonstrated a significant impact on the extracts’ TPC and AC, with holdfasts showing the highest values (TPC: 95 ± 24 mg phloroglucinol equivalents/g dry extract; DPPH: 400 ± 140 μmol Trolox equivalents/g dry extract; ORAC: 560 ± 130 μmol TE/g dry extract). Accordingly, holdfast extracts presented the most potent α-glucosidase inhibition, with D. incurvata from Niebla showing an activity equivalent to fifteen times that of acarbose. Only one frond and stipe extract showed significant α-glucosidase inhibitory capacity. No α-amylase inhibition was found in any extract. Although no HMF was detected, potentially hazardous cadmium levels (over the French limit) and substantial mannitol concentrations—reaching up to 50% of the extract dry weight—were found in most seaweed samples and extracts. Therefore, further purification steps are suggested if food or pharmaceutical applications are intended for the seaweed PHLE extracts obtained in this study.

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Kumar, U. Seeta Uthaya, M. T. Paridah, F. A. T. Owolabi, Deepu A. Gopakumar, Samsul Rizal, A. A. Amirul, A. A. Rahman et al. « Neem leaves extract based seaweed bio-degradable composite films with excellent antimicrobial activity for sustainable packaging material ». BioResources 14, n^o 1 (3 décembre 2018) : 700–713. http://dx.doi.org/10.15376/biores.14.1.700-713.

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Seaweed-based biodegradable films were studied with incorporation of different concentrations of neem (Azadirachta indica) leaf extract. The films were fabricated via a hot casting method and were subjected to physical, mechanical, and morphological examinations to investigate the effect of the neem extract reinforcement in the edible film. There was moderate improvement in the tensile strength, contact angle values, and elongation at break values, while the water vapour permeability was reduced with the addition of neem leaves extract beyond 5 w/w %. Analysis of the morphology of the fabricated films confirmed that there was good dispersion of the neem leaves extract in the seaweed matrix films, which resulted in the enhanced mechanical strength of the fabricated films. Moreover, the fabricated composite films showed excellent antimicrobial activity towards both Gram-positive bacterium subclasses (coccus and bacillus), which is highly desirable for the packaging material in the current scenario. So far, this is the first report on neem leave based seaweed films with enhanced antimicrobial activity, which makes them suitable for sustainable packaging application. The experiments showed that the seaweed-based film incorporated with neem leaves extract has potential application as an active packaging material due to its enhanced mechanical properties and antimicrobial activity.

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Pacheco, Ana Cláudia, Leonardo Araujo Sobral, Pedro Henrique Gorni et Marcia Eugenia Amaral Carvalho. « Ascophyllum nodosum extract improves phenolic compound content and antioxidant activity of medicinal and functional food plant Achillea millefolium L. » 2019 13, (03) 2019 (20 mars 2019) : 418–23. http://dx.doi.org/10.21475/ajcs.19.13.03.p1342.

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Genetic, biochemical and physiological parameters can be changed by applying seaweed extract-based products. However, there is scarce information about the influence of seaweed extract on yarrow performance (Achillea millefolium L.), which is widely used in the folk medicine. Therefore, this study aimed to evaluate the effects of Ascophyllum nodosum extract on plant development (leaf and root biomass, and leaf area), physiological indexes (leaf weight ratio, and root: leaf ratio), secondary metabolite (phenolic compounds) content and antioxidant activity of yarrow. The experiment was carried out in a completely randomized design with 4 treatments (seaweed extract concentrations 0, 3, 6 and 9 mL L-1) and 10 replications. The higher concentration of seaweed extract caused higher total dry weight of plants (from 17.8 to 19%), especially due to increases in the root biomass (up to 28.5%). Only plants that received the highest concentration of seaweed-based product presented increments in the number of leaves when compared to the control plants (18.3 %). Furthermore, the use of A. nodosum extract 9 mL L-1 provided increases in the antioxidant activity and content of phenolic compounds in leaves (up to 30.44%). In conclusion, application of A. nodosum is a potential tool strategy to improve the quality of raw material from yarrow plants, since it increased the phenolic compound content and antioxidant activity in leaves, which are the plant organs commonly used in folk medicine.

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Usman, Yusnita. « Formulasi dan Uji Stabilitas Hand Body Lotion dari Ekstrak Etanol Rumput Laut (Eucheuma cottonii) ». Journal Syifa Sciences and Clinical Research 4, n^o 1 (9 février 2022) : 83–91. http://dx.doi.org/10.37311/jsscr.v4i1.13519.

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Research has been carried out on formulation and stability test of hand body lotion from ethanolic extract of seaweed (Euchema cottonii). This study aims to obtain a hand body lotion formulation from seaweed extract (Eucheuma cottonii) that meets the requirements for the physical quality of the lotion, where the formula made consists of 4 formulas with extract concentrations of 5%, 10%, 15% and formulas without extracts. The evaluation of lotion preparations included organoleptic tests, pH tests, homogeneity tests and dispersibility tests. Data analysis was carried out by testing the physical quality of each formula compared to the quality standard of lotion preparations according to theory. From the research that has been done, it shows that the composition of the 4 formulas shows homogeneous results. The pH values of the formulas with extract concentrations of 5%, 10% and 5% and formulas without extracts were 5,8;5,3;5,1 and 6.6 (quality requirements 4,5 -6.6). Meanwhile, the pH distribution of the formula with 5%, 10% and 5% extract concentrations and the formula without extract was 5.2, respectively; 4.8; 4,4 and 5 (quality requirements 5-7). Based on the results obtained, it can be concluded that the formula with an extract concentration of 5% has the most physical stability that meets the requirements for the quality of lotion preparations.

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Uthaya Kumar, U. Seeta, S. N. Abdulmadjid, N. G. Olaiya, A. A. Amirul, S. Rizal, A. A. Rahman, Tata Alfatah, E. M. Mistar et H. P. S. Abdul Khalil. « Extracted Compounds from Neem Leaves as Antimicrobial Agent on the Physico-Chemical Properties of Seaweed-Based Biopolymer Films ». Polymers 12, n^o 5 (14 mai 2020) : 1119. http://dx.doi.org/10.3390/polym12051119.

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Neem leaves extract was incorporated into the matrix of seaweed biopolymer, and the seaweed-neem biocomposite films were irradiated with various doses of gamma irradiation (0.5, 1.5, 2.5, 3.5, and 4.5 kGy). The physical, barrier, antimicrobial, and mechanical properties of the films were studied. The incorporation of 5% w/w neem leaves extract into a seaweed-based film, and gamma irradiation dose of 2.5 kGy was most effective for improved properties of the film. The results showed that the interfacial interaction of the seaweed-neem improved with physical changes in colour and opacity. The water solubility, moisture content, and water vapour permeability and biodegradability rate of the film reduced. The contact angle values increased, which was interpreted as improved hydrophobicity. The tensile strength and modulus of the films increased, while the elongation of the composite films decreased compared to the control film. The film’s antimicrobial activities against bacteria were improved. Thus, neem leaves extract in combination with the application of gamma irradiation enhanced the performance properties of the film that has potential as packaging material.

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Mubarak, Zaki, Adintya Humaira, Basri A. Gani et Zainal A. Muchlisin. « Preliminary study on the inhibitory effect of seaweed Gracilaria verrucosa extract on biofilm formation of Candida albicans cultured from the saliva of a smoker ». F1000Research 7 (16 août 2018) : 684. http://dx.doi.org/10.12688/f1000research.14879.2.

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Background: Candida albicans is an opportunistic fungus that might infect the oral cavity. Increased colony numbers of C. albicans in the mouth can be caused by multiple factors, such as smoking, weakened immune system, antibiotics use and immune-compromised condition. Smoking can increase expression of virulence factors of C. albicans and make it stronger. One virulence factor of C. albicans is biofilm formation. The ability of creating biofilm makes C. albicans more tolerant to commercial antifungal agents. The objective of this preliminary study was to examine the ability of the seaweed G. verrucosa extracts to inhibit the formation of biofilm by C. albicans isolated from the saliva of a smoker. Methods: The extract of G. verrucosa was prepared by maceration using 96% methanol and subjected for phytochemical analysis. C. albicans was isolated from the saliva of a smoker who voluntarily participated in the study after providing informed consent. In triplicate, the fungus was cultured in the growth medium containing increased concentrations of G. verrucosa (6.25, 12.5, 25, 50, 75 and 100% ).The same reaction using fluconazole 0.31 µg/ml C. albicans was prepared as positive control. Biofilm formation was accessed based on optical density of cell mixtures using an ELISA reader. The data obtained were subjected to Kruskal-Wallis test at a significance limit of 0.05. Results: Methanol extract of seaweed G. verrucosa contained three bio-active compounds namely steroids, terpenoid, and tannins. Inhibitory activity of seaweed extracts on C. albicans biofilm formation increased as their concentration increased. The highest inhibitory effect was recorded at fungus culture treated with seaweed concentration of 25% at 24 hours of time exposure. Conclusions: Seaweed G. verrucosa extract contained steroids, terpenoids and tannins that were able to effectively inhibit the formation of biofilm by C. albicans at the concentration of 25% after 24 hours of time exposure.

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Mubarak, Zaki, Adintya Humaira, Basri A. Gani et Zainal A. Muchlisin. « Preliminary study on the inhibitory effect of seaweed Gracilaria verrucosa extract on biofilm formation of Candida albicans cultured from the saliva of a smoker ». F1000Research 7 (18 septembre 2018) : 684. http://dx.doi.org/10.12688/f1000research.14879.3.

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Background: Candida albicans is an opportunistic fungus that might infect the oral cavity. Increased colony numbers of C. albicans in the mouth can be caused by multiple factors, such as smoking, weakened immune system, antibiotics use and immune-compromised condition. Smoking can increase expression of virulence factors of C. albicans and make it stronger. One virulence factor of C. albicans is biofilm formation. The ability of creating biofilm makes C. albicans more tolerant to commercial antifungal agents. The objective of this preliminary study was to examine the ability of the seaweed G. verrucosa extracts to inhibit the formation of biofilm by C. albicans isolated from the saliva of a smoker. Methods: The extract of G. verrucosa was prepared by maceration using 96% methanol and subjected for phytochemical analysis. C. albicans was isolated from the saliva of a smoker who voluntarily participated in the study after providing informed consent. In triplicate, the fungus was cultured in the growth medium containing increased concentrations of G. verrucosa (6.25, 12.5, 25, 50, 75 and 100% ).The same reaction using fluconazole 0.31 µg/ml C. albicans was prepared as positive control. Biofilm formation was accessed based on optical density of cell mixtures using an ELISA reader. The data obtained were subjected to Kruskal-Wallis test at a significance limit of 0.05. Results: Methanol extract of seaweed G. verrucosa contained three bio-active compounds namely steroids, terpenoid, and tannins. Inhibitory activity of seaweed extracts on C. albicans biofilm formation increased as their concentration increased. The highest inhibitory effect was recorded at fungus culture treated with seaweed concentration of 25% at 24 hours of time exposure. Conclusions: Seaweed G. verrucosa extract contained steroids, terpenoids and tannins that were able to effectively inhibit the formation of biofilm by C. albicans at the concentration of 25% after 24 hours of time exposure.

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Zahra, Allya, Irfan Restu Fauzan, Intan Oktavia D, Setyaningrum Setyaningrum et Sujuliyani Sujuliyani. « LIQUID SOAP WITH ADDITIONS SARGASSUM (Sargassum polycystum) EXTRACT ». Buletin Jalanidhitah Sarva Jivitam 1, n^o 2 (1 septembre 2019) : 71. http://dx.doi.org/10.15578/bjsj.v1i2.8480.

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Research on making Sargassum soap with the addition of Sargassum polycystum seaweed was carried out for 2 months at the Jakarta College of Fisheries. This study aims to determine the flow of the Sargassum polycystum soap making process, find out how to make Sargassum polycystum soap extracts, determine the quality of liquid soap produced through sensory, chemical and biological tests. This research uses direct research methods. Research results show that the process of making liquid soap extracts include: preparation of raw materials, maceration, evaporation, rinsing and drying. The process of making liquid soap, among others, by adding chemicals include: texafon S, sodium sulfate, aquades, texafon EVR, glycerin, olive oil Sargassum extract, perfume. Based on the results of sensory testing of soap by adding the concentration of Sargassum extract with soap that did not get the addition of Sargassum, it has an average rating that is almost the same. In addition to knowing the quality of Sargassum, chemical, microbiological and anti-bacterial tests were also carried out. Chemical tests include: Moisture content, specific gravity, viscosity, foam stability, Ph test, and free alkali. While the microbiological tests conducted on soap are: ALT.Keywords: Liquid soap, Seaweed, Sargassum, Extract

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Loconsole, Danilo, Anna Elisa Sdao, Giuseppe Cristiano et Barbara De Lucia. « Different Responses to Adventitious Rhizogenesis under Indole-3-Butyric Acid and Seaweed Extracts in Ornamental’s Cuttings : First Results in Photinia x fraseri ‘Red Robin’ ». Agriculture 13, n^o 3 (21 février 2023) : 513. http://dx.doi.org/10.3390/agriculture13030513.

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Fraser’s photinia ‘Red Robin’ (Photinia x fraseri Dress, Rosaceae family) is an important primary ornamental landscaping species with optimal hedge or screen effects and low maintenance, but it is difficult to root when propagated by cuttings, although high concentrations of phytohormones are used to optimize rhizogenesis. To our knowledge, there is currently no feasible enhanced method for photinia vegetative propagation through stem cuttings, using seaweed extract-based biostimulants as root promoters. Given the economic importance of the species, this research aims to assess the effects of indole-3-butyric acid (IBA) and seaweed extract-based stimulators on the quality of photinia ‘Red Robin’ cuttings, in terms of rooting indicators and ground and aboveground agronomic features. The treatments applied were different concentrations of commercial rooting stimulators compared to an untreated control: C0: distilled water; Rhizopon AA: 1% IBA (R1); Kelpak®: 2 mL L−1 (K2); Kelpak®: 3 mL L−1 (K3); Goteo®: 2 mL L−1 (G2); Goteo®: 3 mL L−1 (G3). The first results showed different responses to adventitious rhizogenesis under IBA and both seaweed extract treatments. At 70 DAC (days after cutting), the seaweed extract stimulated the production of over 80% of cuttings with callus; at 240 DAC, the percentage of rooted cuttings treated under R1 was the highest = 34.3%; the worst results were obtained by both biostimulant treatments at the highest doses: K3 = 21.3% and G3 = 20.7%. Furthermore, R1 produced 3.07 roots per cutting, which was 50% higher than the average of all other treatments. The applications of Kelpak® and Goteo® biostimulants, at both concentrations, resulted in an inhibition of root length with values below the untreated control. Rooted cuttings under R1 showed the highest ground (0.35 g) and aboveground (0.47) dry value. Neither seaweed extract, Kelpak® or Goteo®, at different concentrations, improved both the ground and above-ground weights of rooted cutting, compared to the untreated control, indicating that these natural products are not suitable for Fraser’s photinia ‘Red Robin’ propagation using this methodology. The overall quality of cuttings in IBA treatment was the strongest, with 1%, being the optimum concentration. Further research must be conducted to propose effective agronomic protocols by investigating application methods, doses and number of applications, and to clarify the biochemical and molecular mechanisms of action of these seaweed extracts.

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Domingo, Guido, Milena Marsoni, Milena Álvarez-Viñas, M. Dolores Torres, Herminia Domínguez et Candida Vannini. « The Role of Protein-Rich Extracts from Chondrus crispus as Biostimulant and in Enhancing Tolerance to Drought Stress in Tomato Plants ». Plants 12, n^o 4 (13 février 2023) : 845. http://dx.doi.org/10.3390/plants12040845.

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The application of seaweed extract-based biostimulants is a promising approach for achieving sustainable agriculture, with an enormous potential of improving crop yield and mitigating climate change effects. Abiotic stressors, such as drought, are major factors resulting in tomato (Solanum lycopersicum L.) yield losses and seaweed-based biostimulants have been proposed as an eco-friendly strategy to counteract this negative impact. Chondrus crispus is a common red seaweed widely used as source of carrageenans, not yet explored as a plant biostimulant. In this study, a protein hydrolysate-rich C. crispus extract, by-products of the carrageenan extraction, was tested on tomato plants under well-watered condition and water shortage. The foliar application of the protein-rich C. crispus extract conferred drought tolerance to tomato plants resulting in less noticeable visual stress symptoms. Treated plants showed higher shoot height and biomass under both well-watered and water deficit conditions, evidencing the double effect exerted by this new biostimulant, as plant growth promoter and drought stress protector. The treatment with the biostimulant had an effect on levels of abscisic acid and proline, and triggered the expression of Solyc02g084840, a drought marker gene. Finally, a label-free mass spectrometric approach allowed us to identify phycoerythrins and phycocyanins as major bioactive proteins contained in the extract. Altogether, these results indicate that the foliar application of protein hydrolysate-rich extracts from C. crispus improved tomato plant growth and tolerance to drought stress, suggesting a new opportunity for further applications in the agriculture and horticultural sectors.

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Tan, Shiau Pin, Peter McLoughlin, Laurie O'Sullivan, Maria Luz Prieto, Gillian E. Gardiner, Peadar G. Lawlor et Helen Hughes. « Development of a novel antimicrobial seaweed extract-based hydrogel wound dressing ». International Journal of Pharmaceutics 456, n^o 1 (novembre 2013) : 10–20. http://dx.doi.org/10.1016/j.ijpharm.2013.08.018.

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MEYER, FABIANO ROSA, VALDECI ORIOLI JÚNIOR, JOÃO VICTOR SILVA BERNARDES et VICTOR PEÇANHA DE MIRANDA COELHO. « FOLIAR SPRAYING OF A SEAWEED-BASED BIOSTIMULANT IN SOYBEAN ». Revista Caatinga 34, n^o 1 (janvier 2021) : 99–107. http://dx.doi.org/10.1590/1983-21252021v34n111rc.

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ABSTRACT Biostimulants currently available on the market include those containing seaweed extract. There is sufficient scientific evidence to conclude that applying biostimulants to agricultural crops can positively impact plant growth and yield. However, results differ between plants species and environmental conditions. As such, the present study aimed to assess the effects of doses and application times of a biostimulant based on seaweed (Ecklonia maxima) extract on the morphology and yield of soybean crops. The experiment was conducted in a field in the municipality of Uberaba, Minas Gerais state (MG), Brazil, in dystrophic red latosol. A randomized block design was used, with four repetitions, in a 3 x 5 factorial scheme consisting of three application times (phenological growth stages: V4, R1 and V4+R1) and five doses of foliar -applied biostimulant (0, 250, 500, 750 and 1000 mL ha-1). In general, biostimulant application influenced the number of branches, nodes, flowers, and pods on the soybean plants and, consequently, crop yield. A dose of 607 mL ha-1 promoted a 6.1% greater grain yield (5379 kg ha-1) than that obtained without biostimulant spraying (5070 kg ha-1). Application in stage R1 resulted in plants with more flowers and pods.

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Saleh, Basel, Laila Al-Hallab et Ayman Al-Mariri. « Seaweed Extracts Effectiveness against Selected Gram-negative Bacterial Isolates ». Biological Sciences - PJSIR 62, n^o 2 (9 août 2019) : 101–10. http://dx.doi.org/10.52763/pjsir.biol.sci.62.2.2019.101.110.

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Aqueous and six solvent extracts of four seaweeds Codium tomentosum (Chlorophyceae); Corallina mediterranea, Hypnea musciformis (Rhodophyceae), and Sargassum vulgare (Phaeophyceae) were screened for their antibacterial activity against 10 gram-negative bacterial isolates. Seaweeds crude extracts potent antibacterial activity have been evaluated based on zone of inhibition (ZI), minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values as reported in manyresearches. Overall, aqueous algal extracts were non active against all tested isolates regardless examined seaweed species. It was noticed that ZIs were in the following order: S. vulgare (17 mm) against Acinetobacter baumannii and C. mediteranea (17 mm) against Salmonella typhimurium > H. musciformis (13 mm) against Escherichia coli O:157 > C. tomentosum (11 mm) against S. typhimurium. Data revealed that the S. vulgare extracts showed the most inhibitory activity by showing the lowest MIC50 value of 0.08 mg/mL (methanolic extract against Shigella flexneri and hexane extract against E. coli O:157 isolate) and also the lowest MBC value of 1.00 mg/mL (methanolic extract against S. typhimurium, Serratia marcescens, E. coli O:157 and Brucella melitensis isolates; and also with ethanolic extract against S. marcescens and E. coli O:157 isolates). Future studies on the S. vulgare extracts are required due to their importance as a potent, promising and cheap source of bioactive compounds for antibacterial pretreatment.

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Elsharkawy, Gehan A., H. A. H. Ibrahim, Alaa H. Salah, Mohammad Akrami, Hayssam M. Ali et Doaa Y. Abd-Elkader. « Early and Total Yield Enhancement of the Globe Artichoke Using an Ecofriendly Seaweed Extract-Based Biostimulant and PK Fertilizer ». Agronomy 11, n^o 9 (10 septembre 2021) : 1819. http://dx.doi.org/10.3390/agronomy11091819.

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This study evaluated the effect of phosphorus and potassium (PK) fertilizer levels and foliar seaweed extract on early and total yield productivity and the growth of globe artichoke plants. Field experiments were conducted over two seasons on loamy–clay soil at the vegetable research farm, of the Faculty of Agriculture, Alexandria University, Egypt. Fertilizer levels of 0, 25, 50 and 75 mL L−1, and seaweed extract concentrations of 0, 5 and 10 mg L−1, individually and in combination, were used. Globe artichoke plants treated with PK liquid fertilizer, with and without seaweed extract, showed critical increases in growth (plant height and number of leaves per plant as well as foliage dry weight), yield, and some chemical constituents compared to untreated plants. The PK3 fertilizer level and 10 mL L−1 seaweed extract as a foliar spray showed greater effects than other combinations.

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Harahap, Muhammad Ridwan, Nizar Mauliza, Anjar Purba Asmara, Elsa Citra Lestari et Winda Afriani. « The Effect of Seaweed Combination on the Extract of Robusta Coffee (Coffea robusta) Waste Extract in Producing Facial Mask Products ». Biomedika 13, n^o 1 (8 juillet 2020) : 15–22. http://dx.doi.org/10.31001/biomedika.v13i1.745.

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Aceh is one of the biggest coffee producers in Indonesia’s province. The coffee farmers separate the coffee beans with the flesh of the fruit for processing the seeds, while the coffee fruit is considered as waste used as animal feed. Based on existing research, the coffee flesh produced contains polyphenol compounds as antibacterial. A very promising sea product from Aceh is seaweed. Brown seaweed (Sargassum sp.) is very common in the west coast of Aceh province. One of the derivatives is alginate. In this study, a combination of polyphenols extracts from coffee flesh and alginates from seaweed Sargassum sp. used as a basic ingredient in making face masks. Tests on organoleptic observations, pH testing, testing time of dried preparations, and testing of bacterial activity have been carried out in this study. In addition, variations in the mixture preparation based on the particle size of alginate powder have also been carried out in this study. The results obtained indicate that the yield produced from coffee fruit extracts is 5.86%, the highest yield of alginate is by potassium carbonate of 40.77%, the acidity of the combination is 4.5 - 6.5. For preparations, drying time has an average estimated time of approximately 6 minutes. Bacterial activity test showed that K2CO3 extracting agent concentration of 2% was strong against bacterial growth with a clean area of 14 mm. With these results, it can be seen the combination is able to inhibit the rate of bacterial growth, so it is recommended for alternative ingredients in the manufacture of cosmetics pharmaceutical industry masks.

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Hung, Yueh-Hao Ronny, Guan-Wen Chen, Chorng-Liang Pan et Hong-Ting Victor Lin. « Production of Ulvan Oligosaccharides with Antioxidant and Angiotensin-Converting Enzyme-Inhibitory Activities by Microbial Enzymatic Hydrolysis ». Fermentation 7, n^o 3 (21 août 2021) : 160. http://dx.doi.org/10.3390/fermentation7030160.

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Seaweed oligosaccharides have attracted attention in food, agricultural, and medical applications recently. Compared to red and brown seaweeds, fewer studies have focused on the biological activity of green seaweed’s oligosaccharides. This study aimed to produce bioactive ulvan oligosaccharides via enzymatic hydrolysis from green seaweed Ulva lactuca. Ulvan, a water-soluble polysaccharide, was obtained by hot water extraction. Two isolated marine bacteria, Pseudomonas vesicularis MA103 and Aeromonas salmonicida MAEF108, were used to produce multiple hydrolases, such as ulvanolytic enzymes, amylase, cellulase, and xylanase, to degrade the ulvan extract. An ultrafiltration system was used to separate the enzymatic hydrolysate to acquire the ulvan oligosaccharides (UOS). The characteristics of the ulvan extract and the UOS were determined by yield, reducing sugar, uronic acid, sulfate group, and total phenols. The FT-IR spectrum indicated that the ulvan extract and the UOS presented the bands associated with O-H, C=O, C-O, and S=O stretching. Angiotensin I converting enzyme (ACE) inhibition and antioxidant activities in vitro were evaluated in the ulvan extract and the UOS. These results provide a practical approach to producing bioactive UOS by microbial enzymatic hydrolysis that can benefit the development of seaweed-based products at the industrial scale.

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Sami, F. J., N. H. Soekamto, Firdaus et J. Latip. « Bioactivity profile of three types of seaweed as an antioxidant, UV-protection as sunscreen and their correlation activity ». Food Research 5, n^o 1 (13 février 2021) : 441–47. http://dx.doi.org/10.26656/fr.2017.5(1).389.

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Seaweed is one of the marine algae that have antioxidant sources because it contains bioactive compounds such as carotenoids, phenol compounds and their derivatives, polysaccharide sulfate, and vitamins. Algae consist of three major groups namely brown algae (phaeophyta), red algae (rhodophyta), and green algae (chlorophyta). The purpose of this study was to determine the bioactivity profile of seaweed extract Eucheuma cottoni, Sargassum polycystum and Caulerpa racemosa so that it could be developed as a cosmetic raw material. The three types of seaweed were extracted by maceration and bioactivity testing was carried out as an antioxidant using the ABTS radical reduction method and bioactivity testing as UV-protection with the parameters of the percentage transmission of erythema, pigmentation and Sun Protective Factor (SPF). The results showed that C. racemosa extract provided a very strong antioxidant activity and was able to protect the skin from UV exposure with an SPF value that was categorized as ultra-protection. Antioxidant activity of the three types of seaweed is positively correlated to the protective effect based on the SPF value.

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Gazali, M., A. Husni, F. A. A. Majid, Zuriat, R. Syafitri, S. Wahyuni et D. Hidayat. « The evaluation of antioxidant action of green seaweed Boergesenia forbesii extracts ». IOP Conference Series : Earth and Environmental Science 1137, n^o 1 (1 janvier 2023) : 012044. http://dx.doi.org/10.1088/1755-1315/1137/1/012044.

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Abstract Boergesenia forbesii is green seaweed in the intertidal Zone of West Aceh that widely distributed in certain season. This study aimed to analyze the activity of antioxidant in green seaweed B. forbesii extract. The samples of B. forbesii were obtained from Intertidal Zone of West Aceh. Subsequently, a vacuum rotary evaporator extracted three solvents based on polarity including methanol, ethyl acetate, and n-hexane solvents. The experimental assays consisted of phytochemical, DPPH antioxidant activity and total phenolic content. The result revealed that the methanol extract (6.26%) yielded the highest rendement, then followed by ethyl acetate extract (4.03%) and n-hexane (0.56%). B. forbesii crude extract have already been detected in phenolic, flavonoid, saponin and steroid compounds. The antioxidant activity measurement with DPPH method indicated that the ethyl acetate extract had higher activity (53.10 mg/L) than methanol crude extract (79.4 mg/L) and n-hexane extract (378.3±0.028 mg/L). It is corroborated with the correlation of TPC and antioxidant activity indicating 99% of scavenging of free radical activity is caused by phenolic groups. The pharmaceutical industry can used in antioxidant agents.

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Pacheco, Luz Verónica, Javier Parada, José Ricardo Pérez-Correa, María Salomé Mariotti-Celis, Fernanda Erpel, Angara Zambrano et Mauricio Palacios. « Bioactive Polyphenols from Southern Chile Seaweed as Inhibitors of Enzymes for Starch Digestion ». Marine Drugs 18, n^o 7 (8 juillet 2020) : 353. http://dx.doi.org/10.3390/md18070353.

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The increment of non-communicable chronic diseases is a constant concern worldwide, with type-2 diabetes mellitus being one of the most common illnesses. A mechanism to avoid diabetes-related hyperglycemia is to reduce food digestion/absorption by using anti-enzymatic (functional) ingredients. This research explored the potential of six common Chilean seaweeds to obtain anti-hyperglycemic polyphenol extracts, based on their capacity to inhibit key enzymes related with starch digestion. Ethanol/water hot pressurized liquid extraction (HPLE), which is an environmentally friendly method, was studied and compared to conventional extraction with acetone. Total polyphenols (TP), antioxidant activity, cytotoxicity and inhibition capacity on α-glucosidase and α-amylase were analyzed. Results showed that the Durvillaea antarctica (cochayuyo) acetone extract had the highest TP content (6.7 ± 0.7 mg gallic acid equivalents (GAE)/g dry seaweed), while its HPLE ethanol/water extract showed the highest antioxidant activity (680.1 ± 11.6 μmol E Trolox/g dry seaweed). No extract affected cell viability significantly. Only cochayuyo produced extracts having relevant anti-enzymatic capacity on both studied enzymes, showing a much stronger inhibition to α-glucosidase (even almost 100% at 1000 µg/mL) than to α-amylase. In conclusion, from the Chilean seaweeds considered in this study, cochayuyo is the most suitable for developing functional ingredients to moderate postprandial glycemic response (starchy foods), since it showed a clear enzymatic inhibition capacity and selectivity.

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Kilowasid, L. M. H., R. Ariansyah, L. Afa, G. A. K. Sutariati, Namriah, T. C. Rakian, M. F. Sanjaya et W. S. A. Hisein. « Seaweed extract effect on arbuscular mycorrhizae spore in soil engineered by earthworm, and the soil effect on upland rice growth ». IOP Conference Series : Earth and Environmental Science 951, n^o 1 (1 janvier 2022) : 012003. http://dx.doi.org/10.1088/1755-1315/951/1/012003.

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Abstract Seaweed extract is known to contain nutrients and growth-regulating substances that affect soil biota, and a source of protection against pests and diseases. Earthworm, which is an example of a soil biota and playing the role of ecosystem engineer, has the ability to produce suitable land biostructures, for the inhabitation of arbuscular mycorrhizal fungi (AMF), which has an impact on upland rice growth. Therefore, this study aims to determine, (i) the effect of seaweed extract on the population of earthworms and spores of arbuscular mycorrhizal fungi, and (ii) the impact of the engineered soil on the growth of local upland rice varieties. Furthermore, the extract of seaweed, such as Kappapychus alvarezii, was divided into five concentration levels, namely 0%, 20%, 40%, 60%, and 80%. Each treatment was drenched into the soil from the cogongrass vegetated area, mixed with 20 Pheretima sp., and maintained for 49 days in the greenhouse. The result showed that the total difference in the earthworms’ concentration treatments was not significant. It also showed that the total AMF spores in the engineered soil products of 20% concentration was the highest. Based on treatment with the earthworm engineered soil products, the highest and lowest vegetative growth and yield components of upland rice were observed at the concentrations of 80% and 0%, respectively. In conclusion, the application of seaweed extract to the soil did not significantly reduce the earthworm population. The extract concentration of 20% also increased the total AMF spore in the engineered soil. Moreover, highly treated engineered soil products increased the growth and yield components of upland Kambowa rice on cogongrass soils.

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Irhimeh, Mohammad R., John D. Curry, Chris Skibola, Martyn T. Smith, Helen Fitton et Raymond M. Lowenthal. « Specific Seaweed Extract Induce Apoptosis in Non-Hodgkin's Lymphoma. » Blood 114, n^o 22 (20 novembre 2009) : 4810. http://dx.doi.org/10.1182/blood.v114.22.4810.4810.

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Abstract Abstract 4810 Diffuse large B-cell lymphoma (DLBCL) is a common subtype of aggressive non-Hodgkin lymphoma derived from germinal center (GC) and (post-) non-GC B-cells based on gene expression studies. Differences in five-year survival rates between these subtypes may be clinically relevant with enhanced survival for GC versus non-GC DLBCL. Although the adoption of R-CHOP as the new standard of care has led to improved outcomes, new treatment modalities are still needed. Seaweed derived galactofucan sulfate is already being widely used as a complimentary medicine by cancer patients. The medical community commonly criticizes the efficacy of naturopathic medicines, as they have not undergone evaluation in an accepted scientific manner. In an on going clinical trial we attempt to evaluate seaweed extracts with respect to its tolerability, safety and activity in cancer patients. In phase-I patients showed no toxicity for seaweed extract (TSE01) and the maximum dose was limited by patients' tolerability to take a number of capsules daily. In phase-II all patients received the 10gm/day of TSE01 or the maximum tolerated dosage observed from Phase-I. We found that a seaweed extract (TSE01) had anti-tumorigenic effects. At the same time different leukemia and lymphoma cell lines were treated with varying concentrations of seaweed extracts that were prepared in house. Cellular viability using the trypan blue exclusion assay, and apoptosis and necrosis using flow cytometric analysis (annexin V apoptosis assay) were studied in four different cell lines; OCI-LY-19, KG1, RL, and WSU-DLCL2. MTT assay was also used to measure the activity of living cells via mitochondrial dehydrogenase activity. RNA was isolated from all cell lines for further analysis. Any concentration of seaweed extract (CSE01) above 5.2 mM was found toxic to all cell lines. CSE01 used at 2.6 mM had an inhibitory effect on the growth of a non-GC DLBCL cell-line, OCI-LY-19, while having no effect on other non-lymphoma or leukemia cell lines. At this specific concentration, we monitored the expression of a panel of pathway or disease-specific genes using the RT2 profiler PCR array system. The human apoptosis pathway-finder PCR array profiles the expression of 84 key genes involved in apoptosis, or programmed cell death. The array includes the TNF ligands and their receptors; members of the bcl-2, caspase, IAP, TRAF, CARD, death domain, death effector domain, and CIDE families; as well as genes involved in the p53 and ATM pathways. After treatment with CSE01, only one cell line (OCI-LY-19) showed changes in the expression of 3 genes (FASLG, BIRC3, TNFRSF1A). A fold-up regulation of 4.4 in the BIRC3 was observed and fold-down regulation of -2.8 and -2088 in TNFRSF1A and FASLG was observed, subsequently. Down regulation of FASLG gene, a TNF ligand family member plays an important role in the apoptosis-induction through mitochondrial pathway of OCI-LY-19 cell line. Given the less favorable response to standard therapies for non-GC DLBCL, investigational approaches using new agents such as CSE01 may eventually improve treatment of these types of lymphoma. Disclosures: No relevant conflicts of interest to declare.

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Bhernama, Bhayu Gita, Witri Maulidy Ayu et Cut Nuzlia. « Antioxidant activity from ethanol extract of red seaweed (Galaxaura rugosa) ». JURNAL SAINS NATURAL 11, n^o 2 (29 juillet 2021) : 79. http://dx.doi.org/10.31938/jsn.v11i2.309.

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Antioxidants are compounds that can delay, reduce, slow down or inhibit oxidation reactions from free radical reactions. Antioxidants donate electrons to unstable free radicals so that these free radicals can be neutralized to not interfere with the body's metabolic processes. Red seaweed Galaxaura rugosa has potential as an antioxidant. The study aimed to determine the antioxidant activity of the ethanol extract of red seaweed Galaxaura rugosa against DPPH free radicals based on the IC50 value. Phytochemical testing and determination of antioxidant activity were carried out using the DPPH method (2,2-diphenyl-1-picrylhydrazyl), which was carried out quantitatively using a UV-Vis spectrophotometer. The results of the phytochemical screening of red seaweed ethanol extract contained alkaloids, flavonoids, saponins, steroids, and polyphenols and the IC50 value of red seaweed ethanol extract was 4.59 ppm, while the positive control for Vitamin C was 6.64 ppm. It was concluded that the ethanolic extract of red seaweed Galaxaura rugosa in the South Aceh District had high antioxidant potential, as evidenced by the small IC50 value of <50 µg/mL.Keywords: Antioxidants, Galauxara rugosa, phytochemicals, DPPH ABSTRAKAktivitas antioksidan dari ekstrak etanol rumput laut merah Galaxaura rugosa Antioksidan merupakan senyawa yang mampu menunda, memperkecil, memperlambat atau menghambat reaksi oksidasi dari reaksi radikal bebas. Antioksidan menyumbangkan elektron kepada radikal bebas yang tidak stabil sehingga radikal bebas ini dapat dinetralkan agar tidak mengganggu jalannya proses metabolisme tubuh. Rumput laut merah Galaxaura rugosa berpotensi sebagai antioksidan. Penelitian ini bertujuan untuk menentukan aktivitas antioksidan ekstrak etanol rumput laut merah Galaxaura rugosa terhadap radikal bebas DPPH berdasarkan nilai IC50. Pada penelitian ini dilakukan pengujian fitokimia dan penentuan aktivitas antioksidan menggunakan metode DPPH (2,2-difenil-1-pikrilhidrazil) yang dilakukan secara kuantitatif menggunakan spektrofotometer UV-Vis. Hasil dari skrining fitokimia ekstrak etanol rumput laut merah mengandung senyawa alkaloid, flavonoid, saponin, steroid dan polifenol serta nilai IC50 ekstrak etanol rumput laut merah sebesar 4,59 ppm sedangkan kontrol positif Vitamin C sebesar 6,64 ppm. Ekstrak etanol rumput laut merah Galaxaura rugosa di Kabupaten Aceh Selatan memiliki potensi antioksidan yang tinggi. dibuktikan dengan nilai IC50 yang yang kecil yaitu < 50 µg/mL.Kata kunci: Antioksidan, Galauxara rugosa, Fitokimia, DPPH

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Sharma, Mukesh, Jai Prakash Chaudhary, Dibyendu Mondal, Ramavatar Meena et Kamalesh Prasad. « A green and sustainable approach to utilize bio-ionic liquids for the selective precipitation of high purity agarose from an agarophyte extract ». Green Chemistry 17, n^o 5 (2015) : 2867–73. http://dx.doi.org/10.1039/c4gc02498b.

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Preferential precipitation of agarose was observed upon addition of choline based bio-ionic liquids in the Gracilaria dura seaweed extract. Choline laurate was found to be the most effective for the work.

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Duraisamy, Pradeepa, Keerthika S, Aswani Ram Vinod et Dhana Rangesh Kumar V. « Preparation and Evaluation of Antioxidant, Antimicrobial Activity of Seaweed (Kappaphycus alvarezii) based Herbal Hair Oil Formulation ». Journal of University of Shanghai for Science and Technology 23, n^o 08 (11 août 2021) : 314–25. http://dx.doi.org/10.51201/jusst/21/08371.

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The present uses of seaweed Kappaphycus alvarezii are as human foods, cosmetics, fertilizers, and for the extraction of industrial gums, chemicals and most importantly seaweeds are rich in source of Omega-3 fatty acid. The aim of present study involves preparation of poly herbal hair oil using methanol extract of brown seaweed and the other herbal plants. The prepared herbal oil was subjected to phytochemical screening, antioxidant activity, antibacterial activity, general characterization, physical and biological evaluation. The current studym involves preparation of poly herbal hair oil using Kappaphycus alvarezii, Aloe barbadensis miller, Murrays Koenigii and Ocimum tenuiflorum. The oil was prepared according to Ayurvedic pharmacopeia. The prepared formulations are assessed for primary skin irritation test on our forearm. The above said parameters were found to be good and within the standards. All the values in the evaluation of finished K. alvarezii based herbal oil showed that they are within the acceptable limits. It is a very good attempt to establish the herbal hair oil containing methanol extracts of red seaweed and the other herbal plants. Hence, it is concluded that the oil is beneficial in maintaining good growth of hairs, turning grey hairs to black, providing protection from dandruff, and results in lustrous looking hairs.

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Hanna, H. Y., et A. J. Adams. « INFLUENCE OF SEAWEED BASED FOLIAR FEED FERTILIZER ON YIELD OF TOMATOES AND CUCUMBER ». HortScience 26, n^o 5 (mai 1991) : 495a—495. http://dx.doi.org/10.21273/hortsci.26.5.495a.

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Seaweed extract has been reported to have various beneficial effects on many crops. A study was conducted in 1989 and 1990 to evaluate the effects of Response 9-9-7, a seaweed extract fortified with NPK, on yield of staked tomatoes and cucumbers. Plants were sprayed to the runoff weekly, biweekly, every 3 weeks and every 4 weeks with 1:500, 1:250, 1:150 and 1:125 v/v Response/water respectively. Results indicate that spring tomatoes sprayed with Response 9-9-7 at all rates outyielded the check which was sprayed with plain water. However, the only significant difference was obtained when tomatoes were sprayed with 1:150 Response/water in 1989 and 1:500 in 1990. Response/water at 1:500 rate significantly increased the quality and marketable yield of cucumber in both years. Response 9-9-7 had no effect on yield of tomatoes grown in the summer under heat stress.

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Martínez-Cabanas, María, Marta López-García, Pilar Rodríguez-Barro, Teresa Vilariño, Pablo Lodeiro, Roberto Herrero, José L. Barriada et Manuel E. Sastre de Vicente. « Antioxidant Capacity Assessment of Plant Extracts for Green Synthesis of Nanoparticles ». Nanomaterials 11, n^o 7 (25 juin 2021) : 1679. http://dx.doi.org/10.3390/nano11071679.

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In this work, water extracts from different bio-based products of plant origin were studied to evaluate their antioxidant capacity and their potential to form metal nanoparticles from aqueous solutions. Two traditional tests, the Folin–Ciocalteu assay and the DPPH radical scavenging capacity method were compared with a more recent one, SNPAC, based on the formation of silver nanoparticles. The silver nanoparticle antioxidant capacity method (SNPAC) was optimized for its application in the characterization of the extracts selected in this work; kinetic studies and extract concentration were also evaluated. The extracts were obtained from leaves of oak, eucalyptus, green tea, white and common thyme, white cedar, mint, rosemary, bay, lemon, and the seaweed Sargassum muticum. The results demonstrate that any of these three methods can be used as a quick test to identify an extract to be employed for nanoparticle formation. Additionally, we studied the synthesis of Cu, Fe, Pb, Ni, and Ag nanoparticles using eucalyptus extracts demonstrating the efficiency of this plant extract to form metallic nanoparticles from aqueous metal salt solutions. Metal nanoparticles were characterized by transmission electron microscopy and dynamic light scattering techniques.

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Fajriah, Sofa, Ilmi Fadhilah Rizki et Ellya Sinurat. « Characterization and analysis of the antidiabetic activities of sulphated polysaccharide extract from Caulerpa lentillifera ». Pharmacia 68, n^o 4 (12 novembre 2021) : 869–75. http://dx.doi.org/10.3897/pharmacia.68.e73158.

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Caulerpa lentillifera is a type of green seaweed that is cultivated in tropical and subtropical areas. The objectives of this study were to determine the characteristics of the sulfated polysaccharides from C. lentillifera and evaluate its antidiabetic activity. In the initial process of this study, samples were macerated with ethanol (1:10). Then, the maceration residue was extracted with an accumulator at 75 °C for three hours. The crude extract yield was 4.16% based on weight seaweed. Ion chromatography purification with DEAE-Sepharose resin provided a yield of 14.8% of crude extract. The monomer analysis of C. lentillifera from the crude extract and purified extract revealed that galactose monomers were dominant and glucose was a minor component. The total carbohydrate and sulfate contents of purified C. lentillifera were higher than those of crude C. lentillifera. Bioactivity tests revealed that purified polysaccharides had higher antidiabetic activity against α-glucosidase enzyme than crude ones with IC50 values of 134.81± 2.0 µg/mL. Purified sulfated polysaccharides of C. lentillifera could potentially be used as an antidiabetic medication.

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Santos, Patrick Luan Ferreira dos, Alessandro Reinaldo Zabotto, Half Weinberg Corrêa Jordão, Roberto Lyra Villas Boas, Fernando Broetto et Armando Reis Tavares. « Use of seaweed-based biostimulant (Ascophyllum nodosum) on ornamental sunflower seed germination and seedling growth ». Ornamental Horticulture 25, n^o 3 (septembre 2019) : 231–37. http://dx.doi.org/10.1590/2447-536x.v25i3.2044.

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Abstract Seaweed extracts are employed as biostimulants due to their beneficial effects on crop growth and yield. Ascophyllum nodosum seaweed extract aid to improve seedling growth and development, and decrease seedlings production costs; however, the correct concentration must be used in order to maximize the biostimulant effects. Consequently, this study aimed to analyze the effects of different concentrations of a seaweed-based (Ascophyllum nodosum) biostimulant on ornamental sunflower seed germination and seedling growth. Seeds of ornamental sunflower cv. “Sol Pleno” were sown in polyethylene trays containing commercial substrate. The treatments consisted of dairy spraying 60 mL of the solutions 0 (control), 5, 10 or 15 mL L-1 biostimulant on substrate. The experimental design was completely randomized with 4 treatments (concentrations of biostimulant) and 4 replicates (10 seeds replicate-1). The evaluated variables were percentage, index and time averages of germination, seedling height, fresh and dry mass of shoot and roots, and root system morphology (WinRhizo). The increase of the biostimulant concentration enhances seed germination and seedlings development. The concentration 15 mL L-1 biostimulant showed the best results for percentage and index of germination and the lowest mean germination time and increase plant height and fresh and dry mass of shoots in relation to the control treatment. Accordingly, 15 mL L-1 biostimulant (Ascophyllum nodosum) is recommended for ornamental sunflower “Sol Pleno” seed germination and seedlings growth.

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Rouphael, Youssef, Maria Giordano, Mariateresa Cardarelli, Eugenio Cozzolino, Mauro Mori, Marios Kyriacou, Paolo Bonini et Giuseppe Colla. « Plant- and Seaweed-Based Extracts Increase Yield but Differentially Modulate Nutritional Quality of Greenhouse Spinach through Biostimulant Action ». Agronomy 8, n^o 7 (21 juillet 2018) : 126. http://dx.doi.org/10.3390/agronomy8070126.

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Plant biostimulants (PBs) such as protein hydrolysates and seaweed extracts are attracting the increasing interest of scientists and vegetable growers for their potential toenhance yield and nutritional quality. The current study assessed crop productivity, leaf colorimetry, mineral profile and bioactive compounds of greenhouse spinach in response to the foliar application of three PBs: legume-derived protein hydrolysate [PH], extract of seaweed Ecklonia maxima or mixture of vegetal oils, herbal and seaweed Ascophyllum nodosum extracts. Plants were PB-treated at a rate of 3 mL L−1 four times during their growth cycle at weekly intervals. Foliar PB applications enhanced fresh yield, dry biomass and leaf area of spinach in comparison with untreated plants. Improved yield performance with PB applications was associated with improved chlorophyll biosynthesis (higher SPAD index). The three PB treatments elicited an increase in bioactive compounds (total phenols and ascorbic acid), thus raised the functional quality of spinach. The application of PH enhanced K and Mg concentrations and did not result in increased nitrate accumulation as observed with the other two PB treatments. Our findings can assist vegetable farmers and the agro-food industry in adopting innovative and sustainable tools such as PB for complementing a high yield with premium quality.

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Zhang, Xunzhong, et E. H. Ervin. « Impact of Seaweed Extract-Based Cytokinins and Zeatin Riboside on Creeping Bentgrass Heat Tolerance ». Crop Science 48, n^o 1 (janvier 2008) : 364–70. http://dx.doi.org/10.2135/cropsci2007.05.0262.

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Kadam, Shekhar U., S. K. Pankaj, Brijesh K. Tiwari, P. J. Cullen et Colm P. O’Donnell. « Development of biopolymer-based gelatin and casein films incorporating brown seaweed Ascophyllum nodosum extract ». Food Packaging and Shelf Life 6 (décembre 2015) : 68–74. http://dx.doi.org/10.1016/j.fpsl.2015.09.003.

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Andrade, Mariana A., Cássia H. Barbosa, Victor G. L. Souza, Isabel M. Coelhoso, João Reboleira, Susana Bernardino, Rui Ganhão et al. « Novel Active Food Packaging Films Based on Whey Protein Incorporated with Seaweed Extract : Development, Characterization, and Application in Fresh Poultry Meat ». Coatings 11, n^o 2 (14 février 2021) : 229. http://dx.doi.org/10.3390/coatings11020229.

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Algae and seaweeds are used in cookery since the beginnings of human civilization, particularly in several Asian cultures. Phenolic compounds are secondary metabolites produced by aquatic and terrestrial plants for their natural defense against external stimuli, which possess powerful antimicrobial and antioxidant properties that can be very important for the food industry. The main objective of this study was to develop a whey protein concentrate active coating, incorporated with a Fucus vesiculosus extract in order to delay the lipid oxidation of chicken breasts. Ten hydroethanolic extracts from F. vesiculosus were obtained and their antioxidant capacity was evaluated through two antioxidant activity assays: the DPPH radical scavenging activity and β-carotene bleaching assay. The total content in phenolics compounds was also determined by Folin-Ciocalteu method. The chosen extract was the one obtained from the freeze-dried F. vesiculosus using 75% (v/v) ethanol as extraction solvent. The extract was successfully incorporated into a whey protein film and successfully strengthened the thickness, tensile strength, and elastic modulus. The active film also was able to inhibit the chicken breasts lipid oxidation for 25 days of storage.

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Baldrick, Francina R., Kevin McFadden, Maria Ibars, Chris Sung, Tanya Moffatt, Kate Megarry, Keith Thomas et al. « Impact of a (poly)phenol-rich extract from the brown algae Ascophyllum nodosum on DNA damage and antioxidant activity in an overweight or obese population : a randomized controlled trial ». American Journal of Clinical Nutrition 108, n^o 4 (1 octobre 2018) : 688–700. http://dx.doi.org/10.1093/ajcn/nqy147.

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AbstractBackgroundEpidemiologic evidence suggests that a diet rich in (poly)phenols has beneficial effects on many chronic diseases. Brown seaweed is a rich source of (poly)phenols.ObjectiveThe aim of this study was to investigate the bioavailability and effect of a brown seaweed (Ascophyllum nodosum) (poly)phenol extract on DNA damage, oxidative stress, and inflammation in vivo.DesignA randomized, double-blind, placebo-controlled crossover trial was conducted in 80 participants aged 30–65 y with a body mass index (in kg/m2) ≥25. The participants consumed either a 400-mg capsule containing 100 mg seaweed (poly)phenol and 300 mg maltodextrin or a 400-mg maltodextrin placebo control capsule daily for an 8-wk period. Bioactivity was assessed with a panel of blood-based markers including lymphocyte DNA damage, plasma oxidant capacity, C-reactive protein (CRP), and inflammatory cytokines. To explore the bioavailability of seaweed phenolics, an untargeted metabolomics analysis of urine and plasma samples after seaweed consumption was determined by ultra-high-performance liquid chromatography–high-resolution mass spectrometry.ResultsConsumption of the seaweed (poly)phenols resulted in a modest decrease in DNA damage but only in a subset of the total population who were obese. There were no significant changes in CRP, antioxidant status, or inflammatory cytokines. We identified phlorotannin metabolites that are considered potential biomarkers of seaweed consumption including pyrogallol/phloroglucinol-sulfate, hydroxytrifurahol A-glucuronide, dioxinodehydroeckol-glucuronide, diphlorethol sulfates, C-O-C dimer of phloroglucinol sulfate, and C-O-C dimer of phloroglucinol.ConclusionsTo the best of our knowledge, this work represents the first comprehensive study investigating the bioactivity and bioavailability of seaweed (poly)phenolics in human participants. We identified several potential biomarkers of seaweed consumption. Intriguingly, the modest improvements in DNA damage were observed only in the obese subset of the total population. The subgroup analysis should be considered exploratory because it was not preplanned; therefore, it was not powered adequately. Elucidation of the biology underpinning this observation will require participant stratification according to weight in future studies. This trial was registered at clinicaltrials.gov as NCT02295878.

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Cozzolino, Eugenio, Ida Di Mola, Lucia Ottaiano, Sabrina Nocerino, Maria Isabella Sifola, Christophe El-Nakhel, Youssef Rouphael et Mauro Mori. « Can Seaweed Extract Improve Yield and Quality of Brewing Barley Subjected to Different Levels of Nitrogen Fertilization ? » Agronomy 11, n^o 12 (7 décembre 2021) : 2481. http://dx.doi.org/10.3390/agronomy11122481.

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Barley is the primary matrix for malting process of beer production. Farmers count on increasing cultivation inputs, especially nitrogen fertilization, in order to reach a higher yield. Nevertheless, an overuse of nitrogen, besides causing environmental damages, can determine a deterioration of quality traits of malting barley, in particular an increase in grains protein content, which should range between 10 and 11% as required by the mating industry. Over two successive years, barley was grown under 4 different nitrogen (N) doses—0 kg N ha−1—N0; 20 kg N ha−1—N20; 40 kg N ha−1—N40 and 60 kg N ha−1—N60, and subject to a biostimulant treatment (Ecklonia maxima seaweed extract). Barley yield and growth parameters increased with nitrogen and seaweed application. N40 was already sufficient in the second year to reach the plateau of the highest production. Biostimulant application increased 17.9% the nitrogen use efficiency, 15.7% the biomass production, and 17.0% the yield with respect to untreated plants. Our results indicate that a significant reduction in nitrogen is possible and desirable, combined with the application of a plant-based biostimulant like seaweed extract, which determines an improvement in nitrogen use efficiency, assuring a higher production and lower fertilization inputs.

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Hanry, E. L., N. F. M. Redzwan, N. F. A. K. Badeges et N. Surugau. « Characterization of biofilms developed from alginate extracted from Padina sp. incorporated with calcium chloride (CaCl₂) ». Journal of Physics : Conference Series 2314, n^o 1 (1 août 2022) : 012022. http://dx.doi.org/10.1088/1742-6596/2314/1/012022.

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Abstract Seaweed has been used in many industries, whether directly or its extract. Padina sp. is one of the understudied species of brown seaweed. Brown seaweed have alginate embedded in their cell wall which is a type of hydrocolloids and can be used in many industries and applications including development of biofilms. The main objective of this current study is to develop biofilms using alginate extracted from Padina sp. and incorporated with calcium chloride at different concentrations. Prior to that, the functional groups of Padina sp. and alginate extract were determined. Then, functional groups, surface morphology, mechanical properties, swelling ability and biodegradability of the biofilms were studied using standard methods. The results showed that there were no significant changes in their FTIR spectra with increasing CaCl2 content. Surface morphology showed improvement in bonding while mechanical properties showed the best tensile strength of 9.43mm and 8.61mm elongation-at-break (EAB) after addition of 0.12g CaCl2. As for their swelling and biodegradability, the samples were completely dissolved after one hour and degraded after 24 hours. This shows that the biofilms with CaCl2 indeed improve the quality of alginate-based biofilms which can further be studied to improve other aspects such as water sorption kinetic and thermal stability.

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Wiraningtyan, Agrippina, Ruslan Ruslan, Putri Ayu Mutmainnah et Magfirah Perkasa. « Application of Natural Dyes and Sodium Alginate From Sargassum Sp. Sea weed In Coloring Bima Woven Fabric ». Oriental Journal Of Chemistry 36, n^o 05 (25 octobre 2020) : 964–67. http://dx.doi.org/10.13005/ojc/360524.

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This study aims to extract dye and alginate from seaweed Sargassum sp. as a dye paste in the coloring of Bima woven fabric. The concentration of sodium alginate used was 0%; 1%; 3% and 5%. The results showed that the absorbance value of the dye extract from seaweed Sargassum sp at maximum λ = 203 nm obtained A = 3.899. The effect of variations in the concentration of sodium alginate in the dye paste was determined by comparing the FTIR absorption pattern of Bima woven fabrics. Based on the FTIR absorption pattern data, it was found that a mixture of dye and sodium alginate of 3% had a stronger intensity, namely the wave numbers 3448.72 cm-1 and 1635 cm-1; 2900.94 cm-1; 2337.72 cm-1; 1381.03 cm-1 and 1064.71 cm-1. The results of the morphological analysis showed significant differences in surface structure on Bima woven fabrics before and after the dyeing process.

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Wariz, Rahmat, Nur WR Asfa et Abul Fauzi. « The toxicity of brown algae (sargassum sp) extract to mice (mus muscullus) ». Journal of Dentomaxillofacial Science 1, n^o 2 (31 août 2016) : 109. http://dx.doi.org/10.15562/jdmfs.v1i2.7.

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Indonesian is a country with very large and overflow marine biological resources. Utilization of seaweed has been developed and become a source of revenue for Indonesian who live in coastal areas with high potential for seaweed.The demand of seaweed in the world increases as increasing in the use of seaweed for various purposeamong others in the fields of industry, food, textile, paper, paints, cosmetics, medical and pharmaceutical field. Alginate is one of materials that commonly used in the field of dentistry as printed materials to create study models. Materials in the field of dentistry must be biocompatible to the oral cavity tissues. The materials should be stable, safe, comfortable, and certainly doesn’t have a toxicity character to the oral cavity tissues and other tissues in human body. The purpose of this study is to know the toxicity of extract brown algaeSargassum sp given orally to mice.The research perform experimental laboratory research type withexperimental post-tes-only control group design. The reseach samples applyfemales white mice (Mus muscullus). Research samples divided into 5 groups of 5 female mices for each treatment group. Treatment group 1 was given 500mg/kgBW doses of Sargassum sp, group 2 was given 1000mg/KgBW doses of Sargassum sp, group 3 was given 1500mg/KgBW doses of Sargassum sp, group 4 were 2000mg/KgBW doses of Sargassum sp, and a control group was given only dose of Na CMC. The result of this study isdose in humans are converted into 2000mg/KgBW in mice, is a doses that doesn’t cause the death of whole animals. Based of acute toxicity category, the extracts of Sargassum sp that obtained from Punaga Takalar Regency, South Sulawesi includes in the mild toxic.

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Getachew, Mehader, Paulos Getachew, Ji-Young Cho, Jae-Suk Choi et Yong-Ki Hong. « The phaeophyte Hizikia fusiformis extracts suppress rhizoid and blade formation in seaweeds ». Botanical Sciences 95, n^o 4 (19 décembre 2017) : 830. http://dx.doi.org/10.17129/botsci.700.

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Background: Plants, including marine algae, produce allelochemicals that influence the growth, survival, and reproduction of other organisms.Questions: To identify natural algicidal or antifouling allelochemicals, we screened 18 common seaweed extracts for suppression of rhizoid and blade production in a convenient Porphyra suborbiculata monospore assay.Species study and data description: Addition of extract from the most potent phaeophyte, Hizikia fusiformis, suppressed rhizoid formation, rhizoid number, rhizoid length, blade formation, and blade length.Study site and dates: Seaweed thalli for methanol extraction were collected on the coast of Korea from October 2012 to July 2015.Methods: Extracts were tested using the P. suborbiculata monospore assay system.Results: The 50 % suppression doses were 15 µg ml-1 for rhizoid formation, 2.4 µg ml-1 for rhizoid number, 13 µg ml-1 for rhizoid length, 6 µg ml-1 for blade formation, and 11 µg ml-1 for blade length. The H. fusiformis extract also suppressed rhizoid and blade production in leafy green (Ulva pertusa) and brown (Undaria pinnatifida and Ecklonia cava) seaweed spores, as well as suppressing diatom settlement.Conclusions: The allelochemicals that suppressed or eliminated competing seaweed species may be efficacious for new seaweed control technologies, including the development of antifouling or algicidal agents based on natural products.

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Mulyani, Hani, Rizna Triana Dewi, Euis Filailla et Nina Artanti. « Effect of Liquid Media Composition on Alpha-Glucosidase Inhibitory Activity from Aspergillus elegans SweF9 ». Jurnal Kimia Terapan Indonesia 21, n^o 2 (29 avril 2020) : 91–100. http://dx.doi.org/10.14203/jkti.v21i2.426.

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This study aims to determine the effect of liquid media composition on the inhibitory activity of α-glucosidase from endophytic fungus Aspergillus elegans SweF9 isolated from seaweed (Macroalgae Euchema sp). Fermentation was carried out in three types of liquid media, namely: potato dextrose broth (PDB), potato malt peptone (PMP), and Czapek-dox broth (CDB), which was incubated for 10 days at room temperature, with static conditions. Ethyl acetate solvents were used to extract active metabolites from fungal biomass and filtrate from each media. Antidiabetic activity was measured based on inhibition of enzyme α-glucosidase. The results showed that filtrate extract of A. elegans SweF9 which was cultured on the media PDB showed highest inhibitor activity to the α-glucosidase enzyme with an IC50 value of 1.74 µg / mL compared to other extracts. Based on these results, the PDB media is an appropriate medium for culturing A. elegans SweF9 to produces secondary metabolites that can be used as a new source of antidiabetic agents.

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Martins, Bruna, Mónica Vieira, Cristina Delerue-Matos, Clara Grosso et Cristina Soares. « Biological Potential, Gastrointestinal Digestion, Absorption, and Bioavailability of Algae-Derived Compounds with Neuroprotective Activity : A Comprehensive Review ». Marine Drugs 20, n^o 6 (28 mai 2022) : 362. http://dx.doi.org/10.3390/md20060362.

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Currently, there is no known cure for neurodegenerative disease. However, the available therapies aim to manage some of the symptoms of the disease. Human neurodegenerative diseases are a heterogeneous group of illnesses characterized by progressive loss of neuronal cells and nervous system dysfunction related to several mechanisms such as protein aggregation, neuroinflammation, oxidative stress, and neurotransmission dysfunction. Neuroprotective compounds are essential in the prevention and management of neurodegenerative diseases. This review will focus on the neurodegeneration mechanisms and the compounds (proteins, polyunsaturated fatty acids (PUFAs), polysaccharides, carotenoids, phycobiliproteins, phenolic compounds, among others) present in seaweeds that have shown in vivo and in vitro neuroprotective activity. Additionally, it will cover the recent findings on the neuroprotective effects of bioactive compounds from macroalgae, with a focus on their biological potential and possible mechanism of action, including microbiota modulation. Furthermore, gastrointestinal digestion, absorption, and bioavailability will be discussed. Moreover, the clinical trials using seaweed-based drugs or extracts to treat neurodegenerative disorders will be presented, showing the real potential and limitations that a specific metabolite or extract may have as a new therapeutic agent considering the recent approval of a seaweed-based drug to treat Alzheimer’s disease.

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Zhang, Xueqian, et Marianne Thomsen. « Biomolecular Composition and Revenue Explained by Interactions between Extrinsic Factors and Endogenous Rhythms of Saccharina latissima ». Marine Drugs 17, n^o 2 (10 février 2019) : 107. http://dx.doi.org/10.3390/md17020107.

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This review provides a systematic overview of the spatial and temporal variations in the content of biomolecular constituents of Saccharina latissima on the basis of 34 currently-available scientific studies containing primary measurements. We demonstrate the potential revenue of seaweed production and biorefinery systems by compiling a product portfolio of high-value extract products. An investigation into the endogenous rhythms and extrinsic factors that impact the biomolecular composition of S. latissima is presented, and key performance factors for optimizing seaweed production are identified. Besides the provisioning ecosystem service, we highlight the contribution of green-engineered seaweed production systems to the mitigation of the ongoing and historical anthropogenic disturbances of the climate balance and nutrient flows. We conclude that there are risks of mismanagement, and we stress the importance and necessity of creating an adaptive ecosystem-based management framework within a triple-helix partnership for balancing the utilization of ecosystem services and long-term resilience of aquatic environment.

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Lv, Jiang Tao, et Qiong Chan Gu. « Identification of the Seaweed Fluorescence Spectroscopy Based on the PCA and ICA-SVM ». Applied Mechanics and Materials 182-183 (juin 2012) : 1958–61. http://dx.doi.org/10.4028/www.scientific.net/amm.182-183.1958.

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Current years, the offing red tide of china is recurrent mutation, the direct and fast method which can analyze the amount and the kind of the phytoplankton is needed imperious. Three-dimensional fluorescence spectrum can show entire fingerprint information of fluorescent light that in the range of excitation and emission wavelength, but the dimension of three-dimensional fluorescence spectrum is higher, the characteristic spectrum of different kinds pelagic plant are multifarious, it is complex identification. In this paper, the principal component analysis (PCA) is used to reduce the dimensions of the spectroscopy. The independent component analysis (ICA) is used to do the matrix decomposition from the perspective of independence to extract the main feature of the spectroscopy data processed by the PCA. The support vector machine (SVM) is used to assort the main characteristic root books which are abstracted by the ICA. The correct laboratory sorting of seaweed is realized. Experimental result indicate, this method can identify the chief component of admixture seaweed, the high dimensional spectroscopy information of seaweed is proceed effective feature extraction, the sorting speed is increase greatly, the discrimination of sorting is reach 92% percent.

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Lyakh, V. A., L. N. Fedyanina, E. S. Smertina, A. A. Shamanskaya, A. D. Khasieva, T. V. Vladykina et O. L. Kalinina. « A food ingredient based on green seaweed in the composition of bakery products. Risks and potential ». Khleboproducty 30, n^o 6 (2021) : 39–43. http://dx.doi.org/10.32462/0235-2508-2021-30-6-39-43.

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The paper presents the results of the development wheat bread using a new ingredient – a water-ethanol extract of the sea green alga Ulva lactuca, which contains biologically active substances, minerals, trace elements, and has a proven positive effect on the human body. Rational dosages of the extract have been selected, eliminating the technological risks of its use in the recipe for bakery products. The safety and quality of a new food ingredient and bakery products with its addition is shown in accordance with the requirements of the regulatory documents of the Russian Federation and the EAEU. This work was supported by the Council for Grants of the President of the Russian Federation for State support of young Russian scientists. Grant number is MK-3686.2021.4. The topic of the scientific research is «Rational use of processed products of non-fish objects of water industry in the technology of safe and high-quality food»

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Kocira, Sławomir, Agnieszka Szparaga, Pavol Findura et Krzysztof Treder. « Modification of Yield and Fiber Fractions Biosynthesis in Phaseolus vulgaris L. by Treatment with Biostimulants Containing Amino Acids and Seaweed Extract ». Agronomy 10, n^o 9 (5 septembre 2020) : 1338. http://dx.doi.org/10.3390/agronomy10091338.

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The most serious of these is to stimulate the development of sustainable and, at the same time, environmentally friendly systems. Therefore, this study aimed to determine the effect of two biostimulants on the bean yield and fiber fractions in seeds: neutral-detergent fiber, acid-detergent fiber, lignin, cellulose, and hemicellulose. The field experiment performed in 2016–2018 in Poland. Over the growing season, plants were treated with biostimulants seaweed extracts (concentrations of 0.7% and 1%) and amino acids (0.3% and 0.5%) based products. Plants were sprayed a single time in the Biologische Bundesanstalt, Bundessortenamt and Chemical industry (BBCH) 13–15 phenological phases and a double spray in the BBCH 13–15 and 61. The study showed a significant increase in bean yield (average 32.08% compare to control) when seaweed extracts was used in the form of a double spray at a higher concentration. In the case of the application of amino acids-based product, the best results (increase of 21.97%) were obtained using a double spray at a lower concentration. It was found that the tested biostimulants changed the fiber fractions of bean seeds. The acid-detergent fiber (ADF) content was the highest (average increase of 2%) after double plant treatment with seaweed extracts based product. While the increased concentration of neutral-detergent fiber (NDF) (over 4%) resulted from double spraying with lower concentration of this biostimulant. The increase in the lignin (ADL) (1.12%), hemicellulose (HCEL) (4.54%), and cellulose (CEL) (0.91%) represented plant response to the double application of this biostimulant in the higher concentration. The results indicated also that the use of amino acids-based product caused an increase in the ADF (0.28%), NDF (10.27%), ADL (0.63%), and HCEL (9.99%) contents in bean seeds as an effect of double plant treatment with this biostimulant at lower concentration.

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Pangestuti, Indria Eka, Sumardianto Sumardianto et Ulfah Amalia. « SKRINING SENYAWA FITOKIMIA RUMPUT LAUT Sargassum sp. DAN AKTIVITASNYA SEBAGAI ANTIBAKTERI TERHADAP Staphylococcus aureus dan Eschericia coli (Phytochemical Compound Screening of Sargassum sp. and It’s Activity as Antibacterial Against Staphylococcus aureus and Escherichia coli) ». SAINTEK PERIKANAN : Indonesian Journal of Fisheries Science and Technology 12, n^o 2 (20 juillet 2017) : 98. http://dx.doi.org/10.14710/ijfst.12.2.98-102.

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ABSTRAKBakteri S. aureus dan E. coli merupakan bakteri patogen yang sering menjadi masalah pada produk makanan terutama pada produk perikanan, sehingga diperlukan senyawa antibakteri yang efektif untuk menghambat pertumbuhannya. Rumput laut Sargassum sp. memiliki senyawa bioaktif yang dapat berfungsi sebagai senyawa antibakteri, seperti flavonoid, saponin, tannin, dan fenol. Tujuan dari penelitian ini adalah untuk mengetahui kandungan fitokimia pada ekstrak rumput laut Sargassum sp. dan mengetahui pengaruh penambahan konsentrasi terhadap pertumbuhan bakteri S. aureus dan E. coli. metode yang digunakan pada penelitian ini adalah eksperimental laboratoris dengan menggunakan model Rancangan Acak Lengkap (RAL). Parameter pengujian yang dilakukan adalah uji fitokimia kuantitatif ekstrak rumput laut Sargassum sp. dan zona hambat ekstrak rumput laut Sargassum sp. menggunakan metode difusi sumur dengan penambahan konsentrasi 0%, 5%, 10%, 15% dan dilakukan 3 kali ulangan. Data hasil uji zona hambat dianalisis menggunakan uji ANOVA (Analysis Of Varians) dan Beda Nyata Jujur (BNJ). Hasil uji fitokimia kuantitatif ekstrak rumput laut terbaik diperoleh pada senyawa saponin yaitu sebesar 3,50±0,06 % sedangkan hasil terendah yaitu fenol 0,09±0,05 %. Hasil penelitian zona hambat menggunakan metode difusi sumur menghasilkan diameter pada bakteri S. aureus berkisar 1,527±0,326 mm sampai 6,323±0,27 mm, sedangkan diameter pada bakteri E.coli berkisar 0±0 mm sampai 3,58±0,33 mm. Berdasarkan hasil tersebut, penambahan konsentrasi ekstrak rumput laut Sargassum sp. memberikan pengaruh terhadap diameter zona hambat bakteri S. aureus dan E. coli.Kata kunci: Rumput Laut Sargassum sp., Fitokimia, Antibakteri, Staphylococcus aureus, dan Eschericia coliABSTRACTS. aureus and E. coli bacteria is a pathogenic bacteria that often cause problems in food products especially in fishery products, so that an effective antibacterial compound is needed to inhibit their growth. Sargassum sp. seaweed has a bioactive compound that can be functioned as antibacterial compound, such as flavonoid, saponin, tannin, and phenol. The aim of this research was to know the phytochemical content in Sargassum sp. seaweed extract and to know the effect of concentration added to the S. aureus and E. coli bacteria growth. This research was using experimental laboratories method with Completely Randomized research Design (CRD). The conducted testing parameter were Quantitative Phytochemical Analysis and Inhibition Zone on Sargassum sp. seaweed extract using diffusion well method with 0%, 5%, 10%, and 15% added concentration for triplicates. The inhibition zone’s data were analyzed using ANOVA (Analysis of Variance) and Honestly SignificaNt Difference (HSD). The best quantitative phytochemical results of seaweed extract was found in the saponin compound which was 3,50 ± 0,06 %while the lowest was found in phenol which was 0,09±0.05 %. The inhibition zone research results using diffusion well method resulted on the S. aureus bacteria’s diameter which was about 1,527±0,326 mm until 6,323 ± 0,27 mm, while E.coli bacteria has about 0±0 mm until 3,58±0,33 mm diameter. Based on the research results above, the concentration addition of Sargassum sp. seaweed extract gave effect to the inhibition zone’s diameter of S. aureus and E. coli bacteria.Keywords: Sargassum sp. Seaweed, Phytochemical, Antibacterial, Staphylococcus aureus, and Eschericia coli

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