Relevant bibliographies by topics / Synthetic colourant

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Academic literature on the topic 'Synthetic colourant'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Synthetic colourant"

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Uchegbu, Nneka, Theresa Nnamocha, and Charles Ishiwu. "Natural Food Colourants Juxtaposed with Synthetic Food Colourant: A Review." Pakistan Journal of Nutrition 19, no. 8 (July 15, 2020): 404–19. http://dx.doi.org/10.3923/pjn.2020.404.419.

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Yee, Low Pinn, Than Chin Ping, Lim Pek Kui, and Chan Sook Wah. "Application of red pitaya powder as a natural food colourant in fruit pastille." Jurnal Gizi Klinik Indonesia 13, no. 3 (January 30, 2017): 111. http://dx.doi.org/10.22146/ijcn.17863.

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Background: Confectionary products meet the important consumers’ need states of fun and enjoyment, especially among children. Synthetic colourant had been applied as a colouring agent in confectionery products for decades, however various adverse health effects have been reported after consumption. Hence, usage of natural colourant has increased enormously as it confers functional and nutraceutical benefits. Red pitaya, a common and popular fruit cultivated in South-east Asian countries. It is rich betacyanin content that gives the fruit a red-violet colour. Hence, red pitaya is a potential source of natural colorant as an alternative to the synthetic colorant.Objective: This research was aimed to produce fruit pastille with red pitaya powder applied as a natural colourant.Method: Production of red pitaya powder was achieved through spray drying process. Fruit pastille was prepared and subjected to antioxidant, stability and sensory analysis.Results: The Physicochemical study showed that pastille incorporated with red pitaya powder exhibited significantly (p<0.05) higher antioxidant properties than the blank pastille (control). An eight weeks storage stability study revealed that betacyanin content of pastille incorporated with pitaya powder remained stable for the first four weeks of storage. Besides, no significant change was observed in redness (a*) of pastille throughout the storage study. Sensory study was carried out to assess the consumer preference on pastille incorporated with pitaya powder and synthetic colourant. Colour attribute of pastille incorporated with red pitaya powder has gained significantly (p<0.05) higher liking that the one added with synthetic colour.Conclusion: Red pitaya powder could be a potential natural colourant for gummy confectionery.
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Sirianuntapiboon, Suntud, and Weerapong Saengow. "Removal of Vat Dyes from Textile Wastewater Using Biosludge." Water Quality Research Journal 39, no. 3 (August 1, 2004): 276–84. http://dx.doi.org/10.2166/wqrj.2004.038.

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Abstract Biosludge from a wastewater treatment plant was able to adsorb colourants, particularly vat dyes, from textile wastewater. Autoclaved and resting biosludge showed different adsorption abilities with different types of vat dyes. The adsorption ability of the biosludge increased with an increase in sludge age (solid retention time; SRT). Autoclaved biosludge showed the highest adsorption ability under acidic conditions (pH 3) while the resting biosludge showed the highest adsorption ability under neutral or weak alkaline conditions. The maximum colourant (Vat Black 25) adsorption capacities of autoclaved and resting biosludge with a sludge age of 24 days were 85.54 ± 0.5 and 37.59 ± 0.6 mg/g biosludge, respectively. Using a sequencing batch reactor (SBR) system, the biosludge was able to remove both organic matter and colourants from both textile and synthetic textile wastewaters. The removal efficiencies of the system increased with an increase in SRT of the system. The removal efficiency of the system with textile wastewater was lower than with synthetic textile wastewater. The BOD5 and colourant removal efficiency of the SBR system with textile and synthetic textile industrial wastewaters under a BOD5 loading of 0.13 kg BOD/m3-d were 70.1 ± 4.4% and 84.9 ± 2.0%, and 98.1 ± 1.5% and 87.5 ± 5.1%, respectively.
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Nithyananda Sastry, D., T. Prabhakar, and M. Lakshmi Narasu. "Studies on preparation of Bio-Paints using fungal bio-colors." Pigment & Resin Technology 45, no. 2 (March 7, 2016): 79–85. http://dx.doi.org/10.1108/prt-02-2015-0022.

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Purpose – This paper aims to isolate fungal strains producing natural colours, explore their application as colourant in paints and develop cost-effective durable natural paints. Design/methodology/approach – Fungal strains producing natural colours of different shades were isolated. Colourant production was carried out by fermentation method. Natural lime, milk, oil-in-water emulsion paints using natural microbial colours and eco-friendly ingredients were prepared. Bio-paint applications were carried out and evaluated. Findings – Our results indicate that microbes in general and fungi in specific represent dependable source of variety of natural colours, and cost-effective durable natural paints can be prepared with commonly available natural ingredients using scientific information based on history of paints. Research limitations/implications – Natural colours are gaining importance because of their use in health, nutrition, pharmaceutical, textile and environmental applications. Nature is quite rich in several types of colourants. Chemical synthesis of synthetic dyes is complex and not environmental friendly. Microbial dyes manufactured can evade inherent environmental problems of synthetic dyes and offer significant opportunity as a colourant in paints. However, only generally regarded as safe microbial strains are to be considered for colour production. Practical implications – Choosing natural alternatives to protect the health and environment is the need of hour. Fungal colourants are relatively more stable and robust and offer significant opportunity as a colourant in paints. Cost-effective durable natural paints can be prepared using selected stable fungal colourants with commonly available natural ingredients. High diversity of rich and complex natural colourants can be obtained from microorganisms. With the available techniques of fermentation, natural colours can be produced in large quantities of on an economically viable scale and explored for their applications. Social implications – Bio-paints are eco-friendly natural paints, low volatile organic compounds (VOC) paints or organic paints alternate to conventional paints. Most of these natural paints are durable, breathable, prevent moisture problems, contribute to a positive room climate, use safer technology and are less energy-intensive than conventional latex paints to produce. These paints improve indoor air quality and reduce urban smog and offer beneficial characteristics such as low odour, excellent durability and a washable finish. Originality/value – Many of the old art works that still survive today are a tangible proof and evidence of beauty and durability of natural paints. Organic materials used in these paints include natural pigments of mineral, plant and animal origin and other raw biodegradable ingredients. Successful commercialisation of many microbial pigments for food and textile applications is reported in literature. Therefore, present research work aims at developing natural paints using microbial pigments and recipes that have been successfully used by people for years.
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Liu, Huwei, Tao Zhu, Yingnan Zhang, Shize Qi, Aijin Huang, and Yiliang Sun. "Determination of synthetic colourant food additives by capillary zone electrophoresis." Journal of Chromatography A 718, no. 2 (December 1995): 448–53. http://dx.doi.org/10.1016/0021-9673(95)00682-6.

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KUMAR, PRAKASH. "Plantation science: improving natural indigo in colonial India, 1860–1913." British Journal for the History of Science 40, no. 4 (July 18, 2007): 537–65. http://dx.doi.org/10.1017/s0007087407000027.

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AbstractThis paper explores the transition to synthetic dyestuffs through a principal focus on developments within the last major holdout of the natural-dye industry, the blue colourant indigo. It starts by looking closely at existing practices of cultivation and manufacture of the natural dye in colonial India in the second half of the nineteenth century. It also develops a case study based on targeted efforts scientifically to improve plant-derived indigo in laboratories and experiment stations in colonial India and imperial England. Experts attempted to increase yields and enhance the purity of the natural dye to meet the competition of the cheaper and purer synthetic indigo launched on the international market in 1897 by two German firms, BASF and Hoechst. The paper explains the patronage of science by European planters, the colonial state and the metropolitan government and analyses the nature of science that emerged in the colonial–imperial nexus.
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Kreit, Eric, Lydia M. Mäthger, Roger T. Hanlon, Patrick B. Dennis, Rajesh R. Naik, Eric Forsythe, and Jason Heikenfeld. "Biological versus electronic adaptive coloration: how can one inform the other?" Journal of The Royal Society Interface 10, no. 78 (January 6, 2013): 20120601. http://dx.doi.org/10.1098/rsif.2012.0601.

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Adaptive reflective surfaces have been a challenge for both electronic paper (e-paper) and biological organisms. Multiple colours, contrast, polarization, reflectance, diffusivity and texture must all be controlled simultaneously without optical losses in order to fully replicate the appearance of natural surfaces and vividly communicate information. This review merges the frontiers of knowledge for both biological adaptive coloration, with a focus on cephalopods, and synthetic reflective e-paper within a consistent framework of scientific metrics. Currently, the highest performance approach for both nature and technology uses colourant transposition. Three outcomes are envisioned from this review: reflective display engineers may gain new insights from millions of years of natural selection and evolution; biologists will benefit from understanding the types of mechanisms, characterization and metrics used in synthetic reflective e-paper; all scientists will gain a clearer picture of the long-term prospects for capabilities such as adaptive concealment and signalling.
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Zaremba, Małgorzata, Jerzy Trzciński, Magdalena Rogulska, Grzegorz Kaproń, Fabian Welc, and Anna Południkiewicz. "A Multiproxy Approach to the Reconstruction of an Ancient Manufacturing Technology: A Case Study of a Faience Ptolemaic Bowl from Tell Atrib (Nile Delta)." Minerals 10, no. 9 (September 5, 2020): 785. http://dx.doi.org/10.3390/min10090785.

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Faience objects produced from the fourth millennium BC in ancient Egypt are considered as the first high-tech ceramics in human history. Despite extensive studies on manufacturing technology, many aspects of this complex technology remain a mystery and there is no methodology in place to unravel the techniques of Egyptian faience object production. Detailed studies presented herein fill the gaps, verifying standing opinions and allowing certain aspects of faience manufacturing technology to be reconstructed. The object of this innovative investigation is a hemispherical faience bowl discovered by archaeologists excavating a Ptolemaic workshop district at the site of Tell Atrib in the southern Nile Delta. The multiproxy analysis included the application of specialised software and preparation techniques coupled with complementary methods of light and digital microscopy, SEM with EDS, XRD, STA with EGA, as well as image analysis. Sources of raw and accessory materials (mineral and organic binders, fluxes, colourants) used for preparing the silica paste and glaze slurry were determined. The results helped to reconstruct how the raw material was prepared and how faience vessels were made. The bowl was moulded by compression using a two-part mould. The moulded and dried bowl was then covered by glaze slurry using the application method. A synthetic colourant, Egyptian Blue, was probably used to colour the glaze. The item was fired once at a temperature of 1050–1150 °C. Oxidised conditions were maintained in the kiln during the firing process and firing at the maximal temperature was relatively short. Application of the multiproxy approach has shed light on the technological aspects of faience bowl manufacturing. The obtained results have confirmed the usefulness of the comprehensive methodology that was applied for the reconstruction of particular manufacturing stages of faience objects.
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Abdel-Moemin, Aly R. "Analysis of the content, colourants, fats, nitrate and nitrite in advertised foods and biological fluids of Egyptian children." British Food Journal 118, no. 11 (November 7, 2016): 2692–709. http://dx.doi.org/10.1108/bfj-03-2016-0125.

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Purpose The purpose of this paper is to analyse the content and some synthetic food colourants, total fats, nitrate and nitrite in both advertised foods (AF) and serum and urine samples of children (8 to 12 years) and their impact on childrens’ diet and health. Design/methodology/approach Analysis of the content of the AF was done by watching the three Egyptian children’s channels (ECC) for 38 hours. Amaranth, Indigo Carmine, Tartrazine, nitrate and nitrite were analysed in all AF and in serum and urine specimens of children. However, total fats were only analysed in the advertised processed meats and in the restaurant dishes. Lipid profile was also estimated in children. Findings The AF accounted for 46-54 per cent of the total advertisements presented. The advertised restaurant dishes were predominantly high in fats, 63 and 55 per cent in restaurant dishes and processed meats, respectively. Tartrazine was the only food colourant found in soft drinks and jelly powders measuring 0.2-15 µg/ml and 25-125 µg/g, respectively. The average levels of total nitrate and nitrite were higher than the acceptable daily intake of the Egyptian and WHO limits (125 mg/kg). Urinary Tartrazine and serum and urinary total nitrate and nitrite were significantly higher in the viewers’ children for the ECC and at borderline for lipid profile compared to non-viewers’ children. Research limitations/implications The most harmful effect of these advertisements is the cumulative effect of AF that undermines progress towards a healthy diet for children. AF may expose children to non-communicable disease in the future. Practical implications The local policy context requires action to set clear rules for children’s food advertising and monitor processed meat products to tackle exceeded levels of nitrate and nitrite. Originality/value This is one of the first studies to analyse colourants, fats, nitrate and nitrite in AF and in the serum and urine of children. This research shows a large number of AF (1,112) in the ECC for 38 hours with statistically significant increase of Tartrazine, nitrate and nitrite in AF (p<0.0001) and in biological fluids (p<0.05).
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Bhandari, Netra Lal, Jyoti Ghimire, Sunita Shrestha, Ganesh Bhandari, Sitaram Bhattarai, and Rameshwar Adhikari. "Green Extraction, Characterization, Applications and Antimicrobial Analysis of Natural Dye from Phyllanthus emblica." Asian Journal of Chemistry 33, no. 2 (2021): 404–10. http://dx.doi.org/10.14233/ajchem.2021.23008.

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Global consciousness towards the organic value of eco-friendly products has attracted the interest of people towards the use of naturally dyed textiles and organic mordants. The present study has been focused not only on exploring the bio-colourant activity of Phyllanthus emblica (Amala) but also on the application of natural mordant for textile dyeing and analysis of its medicinal properties. It has been discovered from the investigation that biomordants like extract of Aloe vera’s as well as extract of mango’s bark extract were able to evince their characteristic colour ameliorate behaviour close to synthetic ones. Besides, the disparity in absorbance band in ultraviolet spectroscopy, distinction in functional groups and differences in surface morphology of two extracted dyes were observed that provided information on colour variation in the cotton fabrics. An eagle gray shade and brown-hued on the cotton fabric were noticed from water and ethanol extracted dyes, respectively. Further, it is confirmed that the natural dyes contain bioactive phytochemicals like tannins, phenols and flavonoids that provide a significant antibacterial activity which will help it to be beneficially utilized in protective medical clothing.
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Dissertations / Theses on the topic "Synthetic colourant"

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Craig, M. R. "Azo dye rotaxanes." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365821.

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Turvill, Michael W. "The synthesis of natural and synthetic colouring materials." Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280103.

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Bingham, Stephen John. "The total synthesis of carminic acid." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260260.

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Mcclure, Kathryn Raeburn. "Development of new extraction methods for analysis of natural and synthetic organic colourants from historical and artistic matrices." Master's thesis, Universidade de Évora, 2020. http://hdl.handle.net/10174/29168.

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Abstract: In this thesis, an innovative approach for the extraction and clean-up of natural and synthetic textile dyes based on a recently developed ammonia extraction protocol and a novel Dispersive Liquid-Liquid Microextraction (DLLME) is presented. The thesis builds upon recent research highlighting the benefits of the ammonia-based extraction protocol for efficient extraction and preservation of the glycosyl moieties present in some types of natural dyes. This state-of-the-art extraction technique requires the use of a clean-up step to purify and preconcentrate the dye molecules for analysis. This clean-up step has never before been investigated or developed, and current methods rely upon traditional Liquid-Liquid Extractions (LLE), which are not well suited to the very small quantities of materials available for the analysis of artefacts of cultural heritage. The novel DLLME protocol presented by this thesis was developed in order to improve the recovery of natural dyes for analysis, and is also the first clean-up protocol to be developed for the analysis of synthetic textile dyes from cultural heritage matrices. Whilst a clean-up system has never before been applied to synthetic dyes within cultural heritage, pre-concentration and pre-treatment protocols are frequently reported for analysis of the same type of dyes used in food colourants. For this reason, this research adapts a DLLME method from the analysis of edible products, and combines this with the state-of-the-art ammonia extraction method reported in literature. DLLME protocols for both natural and synthetic dyes were developed and optimised first on known analytical standards, considered representative of the possible structures of natural dyes and synthetic azoic acid dyes respectively. The extraction recoveries of a variety of disperser and extraction solvents were analysed using HPLC coupled with targeted mass spectrometry. The optimised conditions were then coupled with the ammonia based extraction to ensure coherence of the methods. The results showed significant improvements in the recovery of natural dye analytes compared to current methods, as well as increased precision and efficiency. For synthetic dyes, results showed adequate recovery of analytes and allowed the ammonia-based extraction method to be applied successfully for the first time. After optimisation, the protocol for synthetic dyes was applied successfully to 15 samples (11 fibres, 4 powders) of suspected azo dyes from the Azienda Coloranti Nazionali e Affini (ACNA) synthetic dye collection housed at Sapienza University of Rome’s Museum of Chemistry. The novel protocol was performed after preliminary Raman screening to obtain some introductory information about the unknown samples in the collection. After application of the novel protocol, the samples were identified through untargeted analysis by HPLC-HRMS.
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Reichel, Oliver [Verfasser]. "Synthesis and Properties of Photochromic Layered Silicates and Model Experiments for Colouring and Reinforcement in Organic Coatings by Layered Silicates / Oliver Reichel." Aachen : Shaker, 2014. http://d-nb.info/1050342216/34.

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Book chapters on the topic "Synthetic colourant"

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Scotter, M. J. "COLORANTS (COLOURANTS) | Properties and Determinants of Synthetic Pigments." In Encyclopedia of Food Sciences and Nutrition, 1556–67. Elsevier, 2003. http://dx.doi.org/10.1016/b0-12-227055-x/00282-0.

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Biswal, Trinath, and Munmun Priyadarsini. "Dyeing Processing Technology." In Impact of Textile Dyes on Public Health and the Environment, 115–45. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0311-9.ch006.

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Among the different substances containing organic compounds, dyes are considered the most important class, and they are now an essential requirement in the modern world, mostly in the textile industries. In addition to the textile colouring, they are used in automobile, leather, paints, paper industries, etc., but their importance in the textile industries is maximum. Because of huge demand of dye, the production of a variety of dyes with advanced properties has drastically increased. Since dyes are complex aromatic organic compounds containing conjugated double bonds, they are highly toxic to the biological community of the world. In this chapter, more emphasis is given for synthesis technologies of various kinds of dyes, different kinds of hazardous pollutants generated from the dyeing industries, and their environmental impact along with the implementation of the technology developed to reduce the pollutant and its effect to our sustainable environment. Hence, more focus has to be given for manufacturing and application of dyes from renewable natural resources.
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