Letteratura scientifica selezionata sul tema "Anthocyanes et activité antioxydante"
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Articoli di riviste sul tema "Anthocyanes et activité antioxydante":
Franck Mignanwandé, Zinsou, Armelle Sabine Yélignan Hounkpatin, Roch Christian Johnson, Delphin Anato, Wilfrid Hinnoutondji Kpètèhoto e Madjid Olatoundé Amoussa. "Etudes ethnomédicinale, phytochimie et activité antioxydante de Crateva adansonii DC (Capparidaceae) dans les communes de Cotonou et de Dassa-Zoumè au Benin". Journal of Animal & Plant Sciences 46, n. 1 (31 ottobre 2020): 8071–89. http://dx.doi.org/10.35759/janmplsci.v46-1.2.
NACO, Mohamed El Béchir, Dalane Bernadette COULIBALY, Harouna TIRERA, Madani MARIKO, Benoît Yaranga KOUMARE, Bara NDIAYE, Serigne Omar SARR, Rokia SANOGO e Amadou DIOP. "Composition phytochimique et activité antioxydante des feuilles de Combretum micranthum G. Don (Combretaceae) collectées dans les régions de Kita (Mali) et de Thiès (Sénégal)". International Journal of Pharmaceutical, Physico-chemical and Nutritional Analysis 1, n. 1 (1 giugno 2021): 34–42. http://dx.doi.org/10.61585/pud-ijppna-v1i1a5.
Bashige, V. C., A. S. Bakari, B. J. Kahumba e J. B. S. Lumbu. "Activité antioxydante de 53 plantes réputées antimalariques en République Démocratique du Congo". Phytothérapie 19, n. 5-6 (ottobre 2021): 355–71. http://dx.doi.org/10.3166/phyto-2021-0274.
Bamba, Bourahima, Comoé Koffi Donatien Benie, Abou Ouattara, Dahiro Noël Doukourou, Richard Kamou Kamou e Karamoko Ouattara. "Teneurs en phénols totaux, activités antioxydantes des macérés et décocté des feuilles de Uvaria chamae P. Beauv. (Annonaceae)". International Journal of Biological and Chemical Sciences 15, n. 1 (20 aprile 2021): 54–67. http://dx.doi.org/10.4314/ijbcs.v15i1.6.
Selka, M. A., A. Chenafa, M. Y. Achouri, L. Aoued, S. Tareb, M. A. Nourredine e H. Toumi. "Activité antimicrobienne et antioxydante des feuilles de Vitis vinifera L." Phytothérapie 14, n. 6 (25 maggio 2016): 363–69. http://dx.doi.org/10.1007/s10298-016-1036-5.
Bouyahya, A., J. Abrini, A. Et-Touys, F. Lagrouh, N. Dakka e Y. Bakri. "Analyse phytochimique et évaluation de l’activité antioxydante des échantillons du miel marocain". Phytothérapie 16, S1 (dicembre 2018): S220—S224. http://dx.doi.org/10.3166/phyto-2019-0148.
Krimat, S., H. Metidji, C. Tigrine, D. Dahmane, A. Nouasri e T. Dob. "Analyse chimique, activités antioxydante, anti-inflammatoire et cytotoxique d’extrait hydrométhanolique d’Origanum glandulosum Desf." Phytothérapie 17, n. 2 (aprile 2019): 58–65. http://dx.doi.org/10.3166/phyto-2019-0137.
Ben-Moussa, Mohammed Tahar, Khaled Khelil, Hassina Harkat, Samia Lakehal e Youcef Hadef. "Chemical composition, antimicrobial and antioxidant activity of the essential oil of Brocchia cinerea VIS. from Algeria". Batna Journal of Medical Sciences (BJMS) 7, n. 2 (9 novembre 2020): 122–28. http://dx.doi.org/10.48087/bjmsoa.2020.7213.
Belguendouz, R., e H. Khelifa. "Caractérisation chimique et évaluation de l’activité antimicrobienne des flavonoïdes extraits des feuilles de Citrus clementina de la région de la Mitidja (Algérie)". Phytothérapie 18, n. 5 (ottobre 2020): 291–300. http://dx.doi.org/10.3166/phyto-2018-0099.
Belguendouz, R., e H. Khelifa. "Caractérisation chimique et évaluation de l’activité antimicrobienne des flavonoïdes extraits des feuilles de Citrus clementina de la région de la Mitidja (Algérie)". Phytothérapie 18, n. 5 (ottobre 2020): 291–300. http://dx.doi.org/10.3166/phyto-2018-0099.
Tesi sul tema "Anthocyanes et activité antioxydante":
Fargeix, Guillaume. "Étude des mécanismes d'oxydation de flavonoïdes en relation avec leur activité antioxydante : effets anti- et pro-oxydants dans l'inhibition de la peroxydation lipidique par les flavonoïdes". Lyon 1, 2000. http://www.theses.fr/2000LYO10281.
M'be, Cho. "Procédés de production et influence des propriétés fonctionnelles des poudres de calices d’Hibiscus sabdariffa et de leurs fractions sur la formulation de boisson". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0274.
Hibiscus sabdariffa (hibiscus) is a plant with edible calyxes containing polyphenol and anthocyanin molecules that are both antioxidant compounds and responsible for their attractive red color for consumers. These particularities constitute a good health potential that meets the current market demands, and an economic potential for industries. However, this tropical and seasonal plant whose water-rich calyxes are highly perishable, sensitive to humidity and heat, and whose the interesting molecules (anthocyanins) are heat-sensitive and unstable in aqueous medium. In this context, the calyx transformation into powder allows, besides optimizing the transport cost and storage space, to stabilize the calyxes by ensuring a long product shelf-life, and to improve the biomolecule accessibility. This allows to benefit to its health assets provided that the process is controlled. One of the best ways to preserve the calyx original nutritional properties (anthocyanin content, antioxidant activity) is to obtain minimally processed products by combining controlled oven-drying, grinding and fractionation by sieving. This process was studied in this work and the powder physicochemical properties (particle size and shape, structure, porosity, fiber proportion, anthocyanin content, antioxidant activity) and functional properties (flowability, reconstitution, biomolecule extractability) were systematically evaluated for drink formulation. The interest of such a process is the ease of its implementation applicable to all plants, the powder ease of use, the improvement of the biomolecule availability and accessibility. This work allows identifying the impact of sun-drying and grinding on the powder physicochemical properties, the latter impacting the functional properties. The substitution of sun-drying by controlled oven-drying and an additional fractionation by sieving preceded by grinding allowed improving the powder functional properties. These powder functional properties were singular and allowed to distinguish specific applications for each powder type (fine or coarse powders)
Garaudée, Sandrine. "Polyphénols : propriétés de complexation et activité antioxydante". Université Louis Pasteur (Strasbourg) (1971-2008), 2004. http://www.theses.fr/2004STR13005.
This phd manuscript presents an original and highly collaborative research work on norbadione a, a fungal pigment which was isolated from pisolithus arhizus. This study was undertaken in order to gain insight into complexation, exchange and accumulation of radionuclides (137cs) or heavy metals (cd(ii), ni(ii), pb(ii)). This subject required interdisciplinary expertise (mycology, natural products extraction and characterisation, organic traces analysis, physicochemistry) and was using the most recent developments of analytical methods (spectrophotometry, nmr, mass spectrometry, potentiometry, cyclic voltammetry). Our results were published in chemical communications, highlighted in nature and emphasised in different press articles (l'express, the guardian,. . . ). Our results revealed that in the p[h] range (between 6. 0 and 6. 5) which is typical for mushrooms, the major species of free norbadione a is the dienolate form. We showed that norbadione a was able to accumulate monovalent cations (cs+, k+, tl(i)) due to allosteric properties which favors the formation of bimetallic complexes. On the other hand, norbadione a forms mononuclear complexes with heavy metals like cd(ii), ni(ii) and pb(ii), the corresponding dinuclear analogs being less stable for electrostatic reasons. The natural dipotassic norbadione a complex exchanges its potassium cations with caesium or thallium(i), as shown by electrospray mass spectrometry. Finally, we determined for norbadione a an antiradicalar power comparable with that of the most abundant polyphenols present in fruits and vegetables and a moderate antioxidant activity
Marteau, Clémentine. "Activité antioxydante des phénols : mécanismes, cinétiques, effets de solvants et synergies". Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10046.
Perfumes are composed of molecules which are prone to autoxidation in the presence of oxygen. This oxidative degradation can lead to the loss of olfactory properties, the appearence of off-odours or colors and the formation of irritant or allergenic substances. The antioxidants addition is necessary to stabilize formulas. However, consumers distrust the synthetic antioxidants such as BHA or BHT which are or will be banned by future European directives. New alternatives must be found either by identifying the most efficient and the most harmless natural antioxidants, or by taking benefits from the synergies between antioxidants and other ingredients in the formula which are often observed but rarely understood. In this context, the three aims of this work were: to establish mechanisms of antioxidant action, alone or in mixture, to indentify the matrix effects on their efficiency and to rationalize synergies. The target molecule was a fragrant aldehyde (decanal) known to be very sensitive to oxygen and difficult to stabilize. Concerning antioxidants, the choice fell on phenols (synthetic, natural or "fragrant") which inhibit the free radical chain oxidation by transferring a H• to oxygen radical intermediates
Jourdes, Michaël. "Réactivité, synthèse, couleur et activité biologique d'ellagitannins C-glycosidiques et flavano-ellagitannins". Bordeaux 1, 2003. http://www.theses.fr/2003BOR12721.
Great red wines are generally aged in oak barrels for a period from 6 to 18 months, which contributes to improve their organoleptic quality. During this contact with wood in the barrel the wine solution extracts many substances including some C-glucosidic ellagitannins. During this work, we focused on the evolution of C-glucosidic ellagitannins in acidic medium leading to the formation of various products from nucleophilic substitution reactions with vescalagine and various nucleophilic species present in wine. The hemisynthesis of flavano-ellagitannins (acutissimins and epiacutissimins) was achieved via a nucleophilic substitution reaction between vescalagin and catechin and epicatechin in an acidic medium. Their identification and quantification in a red wine aged in oak barrel were carried out by HPLC-ESI-MS. The remarkable stereospecificity of these substitution reactions was examined by molecular modelling of the benzylic cation intermediate. The hemisynthesis of the first member of a new class of compounds called anthocyano-ellagitannins was achieved via a nucleophilic substitution reaction between vescalagin and malvidin. This new complex shows a bathochromic shift of about 15 nm compared to the maximum wavelength of the initial anthocyanin
Adje, Félix Anoh. "Production par procédés membranaires couplés d'extraits polyphénoliques de Carapa procera, Delonix regia et Hibiscus sabdariffa. Détermination des structures moléculaires et des activités antioxydantes". Aix-Marseille 3, 2009. http://www.theses.fr/2009AIX30054.
The extraction of the polyphenols of Carapa procera leaves, of Delonix regia flowers and of Hibiscus sabdariffa calyx was optimized at laboratory scale to obtain a red extracts rich in antioxidants. Anthocyanins, flavonols and phenolic acids of these 3 endemic plants from Ivory Coast were characterized by LC-MS and NMR for the first time in the 2 first plants and confirmed in the third. Water maceration, 12-16h time, of locally dried samples, 1hour time ultrasound-assisted maceration, microfiltration and concentration of the extracts at pilot plant scale allowed the production of 250L of microfiltrate/plant processed with average MFT flows of 100 to 200 L. H-1. M-2. B-1 at 0,6 bar, the volume concentration of the microfiltrates of 100 to 120 times with 16 and 20 L. H -1. M -2 fluxes at 40 bar and at 20°C and to produce powders by atomization, with a 5 to 10 % yield, of polyphenolic extracts (30 in 160 [micro]mol. L-1 AG eq), of which the antioxidant capacity was determined by DPPH and ABTS (from 8 to 30 mmol. L-1 AG eq for RO concentrates and from 220 to 500 mmol. G-1 TEAC for powders)
Muanda, François Nsemi. "Identification de polyphénols, évaluation de leur activité antioxydante et étude de leurs propriétés biologiques". Thesis, Metz, 2010. http://www.theses.fr/2010METZ011S/document.
Natural substances from biomass plant have taken advantage of multiple interests in the biotechnology industries both in food, cosmetic and pharmaceutical. Between these compounds are found much of secondary metabolites which are mainly illustrated in therapeutics. Traditional medicines has used for long time plant materials for healing without knowing what had caused their actions, then studies of secondary metabolites are the subject of numerous studies based on in vitro and in vivo cultures of plant tissues. These include phenolic compounds, polyphenols, flavonoids, anthocyanins, tannins ... which are the subject of our study, compounds widely used in therapeutics as vasculoprotective, anti-inflammatory, enzyme inhibitors, antioxidant and anti free radical. Our work has brought the excerpts from six plants (Daniella oliveri, Desmodium adscendens, Ficus capensis, Securidaca longependuculata, Stevia rebaudiana, and Vitex doniana) traditionally used to treat many diseases in various parts of the world (America, Africa, Asia). The methodology developed for the analysis of these extracts has been applied for the determination of root exudates of Miscanthus x giganteus. The combination of some methods of chemical analysis, spectrophotometry (UV, NMR, MS), chromatography (TLC, CC, HPLC, GC-MS) and biology allowed us to evaluate quantitative and qualitative phenolic extracts from these plants materials. Further analysis helped to highlight the antioxidant capacity and anti-radical of these extracts. While biology tests were used for the evaluation of certain properties such as antimicrobial and anti inflammatory. The results of this work have allowed us to conclude that all plant extracts studied has very good antioxidant properties that may allow us to recommend them in biotechnology
Cerrati, Claude. "Composition lipidique foliaire de plantes de la région méditerranéenne. Caractérisation par couplage CG/SM et activité antioxydante". Aix-Marseille 3, 1993. http://www.theses.fr/1993AIX30072.
Benbouguerra, Nawel. "Évolutions structurales et propriétés biologiques des polyphénols au cours de la maturation des baies de vitis vinifera". Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTG041.
Polyphenols belong to the family of secondary metabolites found in plants and mainly in grape berries. They play an important role in the protection of the plant against biotic and abiotic stresses. They have an impact on the organoleptic quality of certain foods such as those from grapes and are mainly known for their beneficial roles for human health. A global study on the phenolic composition and the biological activities (antioxidant, anti-inflammatory and anti-diabetes) of the phenolic extracts of the seeds and skins of three red grape varieties Merlot, Tannat and Syrah at different stages of maturation was carried out during this thesis. Seed extracts contain a higher content of phenolic compounds than skin extracts for all stages of ripening. The phenolic composition differs depending on the stage of maturity and the tissue of the grape berry (seed or skin). The antioxidant activity of the extracts was determined by spectrophotometric tests (DPPH, ABTS and FRAP) and electrochemical parameters. Anti-inflammatory activity was followed by the inhibition of ROS and NO production by stimulated RAW 264.7 cells. Anti-diabetic effect was determined by measuring the inhibition of the enzyme α-glucosidase activity. The biological activities are positively correlated with the content of flavanols and negatively correlated with the content of anthocyanins and stilbenes. The most important biological activities were measured before maturity for all the tests and in the three grape varieties studied
Tangsumranjit, Anothai. "Vectorisation à visée topique du palmitate d'ascorbyle : optimisation, étude de stabilité, activité antioxydante sur culture de kératinocytes". Besançon, 2005. http://www.theses.fr/2005BESAA010.
The stability and the antioxidant activity of ascorbyl palmitate (AP), a lipophilic antioxidant, were developed as a topical formulation by loading in biodegradable nanoparticles and by forming an inclusion complex with hydroxypropyl-β-cyclodextrin (HPβCD). AP loaded poly(D,L-lactide) (PLA) and poly(D,L-lactide-co-glycolide) (PLGA) nanoparticles were prepared by interfacial polymer deposition following solvent displacement method. HPβCD-AP inclusion complex was prepared by flash evaporation method. The results showed that AP loaded PLA nanoparticles prepared from degassing distilled water exhibited the best protection for AP even being stored under atmosphere at 4°C. For in vitro antioxidant activity, AP loaded nanoparticles could effectively protect human keratinocyte (HaCaT) cells against both H2O2 and t-BHP induced cytotoxicity. Ln conclusion, PLA nanoparticles might have a potential as a good carrier for improving stability and antioxidant activity of AP