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Journal articles on the topic 'Coloranti organici'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Nascimento, Matheus Vinícios Leal do, Patrick Luan Ferreira dos Santos, João Victor Costa, Juliana Trindade Martins, Roberto Lyra Villas Bôas, and Leandro José Grava de Godoy. "Durability and concentration of organic colorant in the visual quality of Discovery TM bermudagrass." Ornamental Horticulture 26, no. 4 (2020): 621–32. http://dx.doi.org/10.1590/2447-536x.v26i4.2211.

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Abstract The painting of sports turfs with colorants is a common practice, with the main objective to maintain grass appearance for maximum aesthetic quality. Colorants are used to provide green color to grasses during periods of stress and dormancy and are considered an alternative for warm weather grasses during the winter months. Recent increases in the use of colorants is due to water conservation efforts as well as lower operating costs compared to winter overseeding. The objective of this study was to evaluate durability and doses of organic colorant in terms of visual quality of Discove

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Mortensen, Alan. "Carotenoids and other pigments as natural colorants." Pure and Applied Chemistry 78, no. 8 (2006): 1477–91. http://dx.doi.org/10.1351/pac200678081477.

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Food colorants may be classified into synthetic, nature-identical, inorganic, and natural colorants. Natural colorants for food are made from renewable sources. Most often, the colorants are extracted from plant material, but other sources such as insects, algae, cyanobacteria, and fungi are used as well. Natural colorants are usually extracted and concentrated using either water or lower alcohols for water-soluble pigments and organic solvents for lipophilic pigments. Legislation restricts which colorants are allowed, what sources may be used for that particular colorant, what solvents may be

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Ma, Kang, Yiwen Zhang, and Taipeng Wu. "Accurate Determination of 24 Water-Soluble Synthetic Colorants in Premade Cocktail Using Ultra-Performance Liquid Chromatography with Diode Array Detection." Beverages 11, no. 3 (2025): 91. https://doi.org/10.3390/beverages11030091.

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A rapid, traceable, and highly sensitive method was developed for the simultaneous separation and quantification of 24 water-soluble synthetic colorants in premade cocktails, utilizing ultra-performance liquid chromatography coupled with diode array detection (UPLC-DAD). The purity of each colorant was individually confirmed through multi-wavelength analysis. Chromatographic conditions, including mobile phase composition and gradient elution, were meticulously optimized, achieving the separation of the 24 colorants on a BEH C18 column using a linear gradient elution within 16 min. The mobile p

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Marzec, Anna, Bolesław Szadkowski, Jacek Rogowski, et al. "Carminic Acid Stabilized with Aluminum-Magnesium Hydroxycarbonate as New Colorant Reducing Flammability of Polymer Composites." Molecules 24, no. 3 (2019): 560. http://dx.doi.org/10.3390/molecules24030560.

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In this study, hybrid pigments based on carminic acid (CA) were synthesized and applied in polymer materials. Modification of aluminum-magnesium hydroxycarbonate (LH) with CA transformed the soluble chromophore into an organic-inorganic hybrid colorant. Secondary ion mass spectroscopy (TOF-SIMS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and UV-Vis spectroscopy were used to study the structure, composition, and morphology of the insoluble LH/CA colorant. Successful modification of the LH was confirmed

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Yadav, Chandradip Kumar, and Nabin Basnet. "Dyes and their Importance: A Review." Damak Campus Journal 11, no. 1 (2023): 102–10. http://dx.doi.org/10.3126/dcj.v11i1.63487.

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The global market for pigments and dyes is forecast to reach 9.9 million tons and $26.53 billion by the year 2017, driven by the growth in key end-use industries. Before synthetic dyes and pigments were discovered, limited number of natural colorant has been obtained from plants, animals and minerals. The classification of colorants has become mandatory due to huge increase in kind and number of colorants. For this reason, colorants are classified based on their structure, source, color, solubility and application methods. In this chapter, dyes will be investigated in two different groups as a

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Viera, Isabel, Antonio Pérez-Gálvez, and María Roca. "Green Natural Colorants." Molecules 24, no. 1 (2019): 154. http://dx.doi.org/10.3390/molecules24010154.

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Although there is no legal and clear definition of the term “natural food colorant”, the market trends, and consequently industrial and commercial interest, have turned to foods with added natural pigments. This progressive substitution of artificial colorants has faced chemical complications with some colors, with a lack of stable green hues being one of them. Several strategies have been applied for green color stabilization in processed foods, from the formation of metallochlorophylls to the microencapsulation of green pigments. However, at present, the utilization of green coloring foodstu

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Kiseleva, Daria, Evgeny Shagalov, Elizaveta Pankrushina, Vladimir Shirokov, Arina Khorkova, and Danil Danilov. "Microanalytical Investigation of Prehistoric Colorants from Uralian Rock Art (Ignatievskaya Cave and Idrisovskaya II and Zmiev Kamen’ Pictographs)." Heritage 6, no. 1 (2022): 67–89. http://dx.doi.org/10.3390/heritage6010004.

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Uralian parietal and rock art (cave paintings and pictographs, or “pisanitsy”) represents a unique archaeological and cultural phenomenon, comprising 90 sites stretching for more than 800 km from north to south, which date from the Paleolithic era extending into the present Holocene epoch. The identification of the nature of prehistoric colorants provides an insight into their provenance, manufacture and utilization, as well as contributing to the conservation and restoration of drawings. The studies of mineral, elemental and organic phase composition of the colorant micro-samples from the dra

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Hashimoto, R. Y., E. S. K. Menon, and J. Fiorillo. "Analysis of Metallic Pigments Used in 19th Century Japanese Prints." Microscopy and Microanalysis 5, S2 (1999): 594–95. http://dx.doi.org/10.1017/s1431927600016299.

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Japanese color woodblock prints ("ukiyo-e") from the Edo (1615-1868) and Meiji periods (1868- 1912) are among the most celebrated examples of color printmaking in the world. Full-color prints became technically and commercially viable around 1765. Traditional ukiyo-e colorants were watersoluble, uniform, translucent, organic (vegetal) and inorganic pigments of very small particle size. (Synthetic colorants were also introduced from the West in the 19th C, probably beginning with "Prussian blue" in the 1820s.) A pigment was applied with a brush to a color block, and then rice flour paste was mi

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Subriya, S., M. Maheshwari, E. Saranya, M. Senthil Nathan, M. Sridevi, and C. Nirmala. "Production of Natural Food Colorant with Organic Mordant Solutions and Incorporation into Modern Food Systems." Journal of Physics: Conference Series 2801, no. 1 (2024): 012018. http://dx.doi.org/10.1088/1742-6596/2801/1/012018.

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Abstract Colorants are an important exposure that affects the way we feel and judge foods. The food colorant is normally associated with the flavor, safety and nutritional value of the food product. Colorant are obtained from natural plants and minerals. In today’s world, synthetic oxidative food colors are used. It contains a high chemical composition and is derived from petroleum or crude oil. Sunset yellow, carmine, amaranth and azorubine are examples of common synthetic food colors. It leads to some diseases such as asthma, allergy reactions and cancer. Hence, natural food colors were prod

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Kumar, Pankaj, Prashant K. Sarswat, and Michael L. Free. "Growth and Capacitive Performance of Metals Engineered Tungsten Oxide Structures and Application in Colorant Sensors." MRS Advances 3, no. 13 (2018): 691–96. http://dx.doi.org/10.1557/adv.2018.279.

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ABSTRACTTungsten oxide based micro and nanostructures as well as their 2-D integrated counterparts with appropriate surface modifications such as sensitization, coating of other semiconductors or growth of functional groups have been examined to enhance supercapacitance and sensing capabilities. With the goal of investigation of these changes, the electrochemical capacitance behavior of newly prepared nano and micro-structured tungsten oxide coated substrates were examined. The utilization of WO3 based sensors to differentiate edible colorant and toxic pigments, was also explored. The systemat

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Marzec, Anna, Bolesław Szadkowski, Jacek Rogowski, Waldemar Maniukiewicz, Przemysław Rybiński, and Mirosława Prochoń. "New Organic/Inorganic Pigments Based on Azo Dye and Aluminum-Magnesium Hydroxycarbonates with Various Mg/Al Ratios." Materials 12, no. 8 (2019): 1349. http://dx.doi.org/10.3390/ma12081349.

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This study set out to investigate the impact of aluminum-magnesium hydroxycarbonates (LHs) with various Mg/Al ratios on the formation of hybrid pigments. The colorants were also evaluated for their flame-retardant properties. In the first part of the study, the hybrid pigments were submitted to comprehensive characterization using time-of-flight secondary ion mass spectrometry (TOF-SIMS), 27Al solid-state nuclear magnetic resonance (NMR) spectroscopy, powder X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), and N2 adsorption as well as scanning and transmission electron micro

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Mandal, Sujata, Ravi Banothu, R. Mohan, and K. J. Sreeram. "Root Cause Analysis of Color Migration in Footwear." Journal of the American Leather Chemists Association 118, no. 4 (2023): 150–55. http://dx.doi.org/10.34314/jalca.v118i4.7205.

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The phenomena of migration and/or bleeding of colorants are one of the major concerns for the footwear and leather goods industries. The migration/bleeding of the colorants from one component to the other has been observed in many cases that spoil the aesthetics of the product, which in turn leads to economic loss for the industries. In this research article, a typical case of color migration in leather footwear has been studied in depth for root-cause analysis of the migration problem. The leather used in the shoe upper (affected due to migration), the lining fabric, and the adhesive used in

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Hiawi, Furat A., and Inaam H. Ali. "Study the Interaction Adsorptive Behavior of Sunset Yellow Dye and Loratadine Drug: Kinetics and Thermodynamics Study." Ibn AL-Haitham Journal For Pure and Applied Sciences 36, no. 1 (2023): 186–96. http://dx.doi.org/10.30526/36.1.2974.

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The performance of drug treatment and assessments of different drugs' side effects both can be affected by the interaction between food additives and drugs. Organic compounds such as food colorants dyes are utilized as additives in a wide range of foods. In this study, the adsorption interaction behavior between the colorant food dye sunset yellow (SY) and the drug loratadine was examined. The adsorption procedure is conducted at different drug dosages, various SY dye concentrations, and different temperature (288-318K). The equilibrium data were explained by using Freundlich and Langmuir adso

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Palanisamy, Satish Kumar, Arun Kumar Udayakumar, Azher M. Abed, et al. "Computational, Investigational Explorations on Structural, Electro-Optic Behavior of Pelargonidin Organic Colorant for TiO2 Based DSSCs." Symmetry 15, no. 1 (2022): 22. http://dx.doi.org/10.3390/sym15010022.

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In an expedition for green-energy generation and to lower the cost per watt of solar energy, environmentally friendly biotic colorants were separated from Tectona grandis seeds. The prime colorant in the extract is pelargonidin which sensitizes titanium dioxide (TiO2)-based photo anodes. The pelargonidin-sensitized TiO2 nanomaterials endured structural, photosensitive, spectral and current-voltage interpretations. Frontier molecular orbital analysis, physicochemical and electronic parameter computation, UV–visible and DOS spectral analysis, van der Waals prediction and molecular electrostatic

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Lombardelli, Claudio, Ilaria Benucci, Caterina Mazzocchi, and Marco Esti. "A Novel Process for the Recovery of Betalains from Unsold Red Beets by Low-Temperature Enzyme-Assisted Extraction." Foods 10, no. 2 (2021): 236. http://dx.doi.org/10.3390/foods10020236.

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Food waste management plays a central role in the circular economy. To our knowledge, only a few studies have investigated the use of unsold fruit and vegetables from supermarkets as a substitute source for the extraction of natural colorants. Thus, the aim of this paper was to suggest a green, tailored protocol that avoids the use of organic solvents for the recovery of betalains from unsold red beets for use as a food colorant. The recovery of such pigments was carried out by a tailored enzymatic mix, blended considering the polysaccharide composition of the beetroot cell wall; thus, it cons

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Akkapinyo, Chutimon, Kittitat Subannajui, Yingyot Poo-arporn, and Rungtiva P. Poo-arporn. "Disposable Electrochemical Sensor for Food Colorants Detection by Reduced Graphene Oxide and Methionine Film Modified Screen Printed Carbon Electrode." Molecules 26, no. 8 (2021): 2312. http://dx.doi.org/10.3390/molecules26082312.

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A facile synthesis of reduced graphene oxide (rGO) and methionine film modified screen printed carbon electrode (rGO-methionine/SPCE) was proposed as a disposable sensor for determination of food colorants including amaranth, tartrazine, sunset yellow, and carminic acid. The fabrication process can be achieved in only 2 steps including drop-casting of rGO and electropolymerization of poly(L-methionine) film on SPCE. Surface morphology of modified electrode was studied by scanning electron microscopy (SEM). This work showed a successfully developed novel disposable sensor for detection of all 4

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Molino, Ralph John Emerson J., Klidel Fae B. Rellin, Ricky B. Nellas, and Hiyas A. Junio. "Sustainable Hues: Exploring the Molecular Palette of Biowaste Dyes through LC-MS Metabolomics." Molecules 26, no. 21 (2021): 6645. http://dx.doi.org/10.3390/molecules26216645.

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Underutilized biowaste materials are investigated for their potential as sustainable textile colorants through an approach based on mass spectrometry, bioinformatics, and chemometrics. In this study, colorful decoctions were prepared from the outer bark of Eucalyptus deglupta and fruit peels of Syzygium samarangense, Syzygium malaccense, Diospyros discolor, and Dillenia philippinensis. Textile dyeing was performed along with liquid chromatography–mass spectrometry (LC–MS)-based untargeted metabolomics to determine the small molecules responsible for the observed colors. Global Natural Products

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18

Rizkiyah, Dwila Nur, Nicky Rahmana Putra, Mohd Azizi Che Yunus, et al. "Insight into Green Extraction for Roselle as a Source of Natural Red Pigments: A Review." Molecules 28, no. 3 (2023): 1336. http://dx.doi.org/10.3390/molecules28031336.

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Roselle (Hibiscus sabdariffa L.) is a source of anthocyanins as red pigments that is extensively farmed in tropical and subtropical regions, including Indonesia, Malaysia, China, Thailand, Egypt, Mexico, and West India. The roselle plant contains a variety of nutrients, including anthocyanins, organic acids, pectin, etc. Due to the toxicity and combustibility of the solvents, traditional extraction methods for these compounds are restricted. Obtaining pure extracts is typically a lengthy procedure requiring many processes. Supercritical carbon dioxide (ScCO2) extraction as a green technology i

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Shkolnikova, Marina, Olga Chugunova, and Svetlana Ivanova. "Secondary raw materials of agricultural processing companies as a source of anthocyanin colorants." E3S Web of Conferences 176 (2020): 03019. http://dx.doi.org/10.1051/e3sconf/202017603019.

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Many recent researches in vitro and in vivo proved the large therapeutic potency of non-toxic anthocyans in anti-inflammatory, anti-infective, anti-oxidative actions. Anthocyanin is a natural phenolic colorant approved in many countries. A reason why the world market of natural food colorants is reduced is because fruit and berry raw materials are expensive. Yet the fruit and berry raw materials are extracted with significant losses and by-products. This constitutes around 23-45% of the whole amount of berries processes in the Russian Federation. Thus, a priority direction of the food industry

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20

Sugaya, Naeko, Mitsuko Takahashi, Katsumi Sakurai, Nobuko Tanaka, Ichiro Okubo, and Tsuyoshi Kawakami. "Mass Spectrometric Analysis of Synthetic Organic Pigments." Journal of AOAC INTERNATIONAL 101, no. 5 (2018): 1328–40. http://dx.doi.org/10.5740/jaoacint.18-0049.

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Abstract Though synthetic organic colorants are used in various applications nowadays, there is the concern that impurities by-produced during the manufacturing and degradation products in some of these colorants are persistent organic pollutants and carcinogens. Thus, it is important to identify the synthetic organic colorants in various products, such as commercial paints, ink, cosmetics, food, textile, and plastics. Dyes, which are soluble in water and other solvents, could be analyzed by chromatographic methods. In contrast, it is difficult to analyze synthetic organic pigments by these me

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Ferreira, Ana M., Isa Sucena, Vanessa Otero, Eva Mariasole Angelin, Maria João Melo, and João A. P. Coutinho. "Pretreatment of Plastic Waste: Removal of Colorants from HDPE Using Biosolvents." Molecules 27, no. 1 (2021): 98. http://dx.doi.org/10.3390/molecules27010098.

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Plastics recycling remains a challenge due to the relatively low quality of the recycled material, since most of the developed recycling processes cannot deal with the additives present in the plastic matrix, so the recycled products end up in lower-grade applications. The application of volatile organic solvents for additives removal is the preferred choice. In this study, pretreatment of plastic packaging waste to remove additives using biosolvents was investigated. The plastic waste used was high-density polyethylene (HDPE) with blue and orange colorants (pigment and/or dye). The first step

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Castro, Tiago Alves, Bruna Santos Leite, Larissa Santos Assunção, et al. "Red Tomato Products as an Alternative to Reduce Synthetic Dyes in the Food Industry: A Review." Molecules 26, no. 23 (2021): 7125. http://dx.doi.org/10.3390/molecules26237125.

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Most dyes used in the food industry are synthetic and can be a health hazard. Red tomato may serve as a natural alternative dye to replace synthetic colorants. This study aimed to review the literature on the addition of red tomato products (powder tomato, paste, freeze-dried, tomato peel powder, tomato pomace) to reduce the usage of synthetic dyes in the food industry. Red tomato products have been used as coloring in pasta, bologna, sausages, cookies, crackers, macaroons, hamburgers, breads, muffins, cheeses, and nuggets. The trans-cis isomerization of lycopene by oxidative processes directl

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Cui, Hongyan, Wenjing Xie, Zhongjie Hua, et al. "Recent Advancements in Natural Plant Colorants Used for Hair Dye Applications: A Review." Molecules 27, no. 22 (2022): 8062. http://dx.doi.org/10.3390/molecules27228062.

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There is an on-going demand in recent years for safer and “greener” hair coloring agents with the global consumer awareness of the adverse effects of synthetic hair dyes. The belief in sustainability and health benefits has focused the attention of the scientific community towards natural colorants that serve to replace their synthetic toxic counterparts. This review article encompasses the historical applications of a vast array of natural plant hair dyes and summarizes the possible coloration mechanisms (direct dyeing and mordant dyeing). Current information on phytochemicals (quinones, tann

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Serafini, Ilaria, Kathryn Raeburn McClure, Alessandro Ciccola, et al. "Inside the History of Italian Coloring Industries: An Investigation of ACNA Dyes through a Novel Analytical Protocol for Synthetic Dye Extraction and Characterization." Molecules 28, no. 14 (2023): 5331. http://dx.doi.org/10.3390/molecules28145331.

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The introduction of synthetic dyes completely changed the industrial production and use of colorants for art materials. From the synthesis of the first synthetic dye, mauveine, in 1856 until today, artists have enjoyed a wider range of colors and selection of chemical properties than was ever available before. However, the introduction of synthetic dyes introduced a wider variety and increased the complexity of the chemical structures of marketed dyes. This work looks towards the analysis of synthetically dyed objects in heritage collections, applying an extraction protocol based on the use of

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Harriman, Anthony. "A Perspective on the Photofading of Organic Colorants." Colorants 3, no. 4 (2024): 263–68. http://dx.doi.org/10.3390/colorants3040018.

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This perspective presents an account of the underlying features associated with the photofading of organic colorants. Photofading is commonly known to the scientific community as photodegradation or photooxidation, while in earlier times the more grandiose term “light fastness” was commonplace. This is a subject of immense diversity and significance, but there are many challenges to be faced when attempting mechanistic reasoning. The text is illustrated by descriptions of several systems taken from the scientific literature, together with anecdotes related to the principal researchers. The che

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MAEZAWA, Daisuke. "The Use of Organic Colorants in Cosmetics." Journal of the Japan Society of Colour Material 85, no. 1 (2012): 19–26. http://dx.doi.org/10.4011/shikizai.85.19.

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Wu, Qiang, Xueying Fu, Zhuo Chen, et al. "Composition, Color Stability and Antioxidant Properties of Betalain-Based Extracts from Bracts of Bougainvillea." Molecules 27, no. 16 (2022): 5120. http://dx.doi.org/10.3390/molecules27165120.

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Betalains in bracts of Bougainvillea are of great application potential as natural food colorants and antioxidants. This study explored the color, spectra, composition, storage stability, and antioxidant properties of betalain-based Bougainvillea bracts extracts (BBEs) to verify their application value. The results showed that Bougainvillea bract color variance is due to varied contents and proportions of betacyanins (Bc) and betaxanthins (Bx). Bc or Bx alone determined hues of purple or yellow, respectively; the co-existence of Bc and Bx would produce varied hues of red. BBEs showed bright co

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Chen, Jun-hua, Guang-ming Zhou, Hong-ying Qin, Yi Gao, and Gui-long Peng. "Organic solvent-free matrix solid phase dispersion (MSPD) for determination of synthetic colorants in chilli powder by high-performance liquid chromatography (HPLC-UV)." Analytical Methods 7, no. 16 (2015): 6537–44. http://dx.doi.org/10.1039/c5ay01105a.

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A green and simple organic solvent-free matrix solid phase dispersion (MSPD) was developed and applied to the extraction of four synthetic colorants (amaranth, sunset yellow, allura red and erythrosine) in chilli samples.

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Anliker, Rudolf, and Eric A. Clarke. "International Regulation of Chemicals - Implications for Organic Colorants." Journal of the Society of Dyers and Colourists 98, no. 2 (2008): 42–55. http://dx.doi.org/10.1111/j.1478-4408.1982.tb03618.x.

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Nakazumi, Hiroyuki. "Organic colorants for laser disc optical data storage." Journal of the Society of Dyers and Colourists 104, no. 3 (2008): 121–25. http://dx.doi.org/10.1111/j.1478-4408.1988.tb01153.x.

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Clarke, E. A., and D. Steinle. "Health and environmental safety aspects of organic colorants." Review of Progress in Coloration and Related Topics 25, no. 1 (2008): 1–5. http://dx.doi.org/10.1111/j.1478-4408.1995.tb00098.x.

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Peters, A. T. "Colorants and auxiliaries: organic chemistry and application properties." Dyes and Pigments 19, no. 2 (1992): 157–58. http://dx.doi.org/10.1016/0143-7208(92)87020-2.

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Vega, Erika N., Adriana K. Molina, Carla Pereira, et al. "Anthocyanins from Rubus fruticosus L. and Morus nigra L. Applied as Food Colorants: A Natural Alternative." Plants 10, no. 6 (2021): 1181. http://dx.doi.org/10.3390/plants10061181.

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Given the importance of colour in the general acceptance or rejection of a product, the use of colorants is a widespread practice, particularly in the food industry. At the same time, with the increasing consumers’ awareness of the health effects that some artificial colorants can exert, there is a growing tendency to prioritize foodstuffs containing natural additives. In this work, Morus nigra L. and Rubus fruticosus L. fruit juices were characterized in terms of anthocyanins, organic acids, free sugars, and tocopherols, as also regarding their bioactive properties. Given their richness in an

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Prado, Juliana M., Priscilla C. Veggi, Grazielle Náthia-Neves, and M. Angela A. Meireles. "Extraction Methods for Obtaining Natural Blue Colorants." Current Analytical Chemistry 16, no. 5 (2020): 504–32. http://dx.doi.org/10.2174/1573411014666181115125740.

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Background: Blue is a color not often present in food. Even so, it is especially attractive to children. Today, most blue coloring agents used by the food industry are synthetic. With increasing health issues concern by the scientific community and the general population, there is a trend to look for natural alternatives to most synthetic products. There only exist few natural blue colorants, which are presented in a literature survey, along with the methods currently used for their recovery from natural sources. The best extraction methods and process parameters for the extraction of blue ant

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Kronenberg, Nils M., Manuela Deppisch, Frank Würthner, Hans W. A. Lademann, Kaja Deing, and Klaus Meerholz. "Bulk heterojunction organic solar cells based on merocyanine colorants." Chemical Communications, no. 48 (2008): 6489. http://dx.doi.org/10.1039/b813341g.

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Wright, Krista, Ina Vanden Berghe, Jenni Sahramaa, and Jenni A. Suomela. "Colorants Detected by HPLC-PDA in Textiles from 13th Century Lieto Ristinpelto, Finland." Heritage 6, no. 2 (2023): 1209–26. http://dx.doi.org/10.3390/heritage6020067.

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Organic colorants of textiles found in the female burial of Lieto Ristinpelto, SW Finland, were analyzed by HPLC-PDA. The textiles’ visible colors varied from different brownish shades to blueish, greenish, and reddish hues. The aim of the chromatographic analysis was to deepen the current understandings of the dyes used in Finland at the transition between the 12th and 13th centuries AD, i.e., at the beginning of the local Medieval period, and to contribute important new information about dyes and clothing from this less-known period of textile history of Finland. The textile finds consisted

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Park, Sunwoo, Sangwook Park, Seyoung Oh, Yeongjae Heo, Hayoon Lee, and Jongwook Park. "Novel Yellow Aromatic Imine Derivative Incorporating Oxazolone Moiety for Color Resist Applications." Applied Sciences 14, no. 11 (2024): 4362. http://dx.doi.org/10.3390/app14114362.

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A novel aromatic imine derivative, 2′-(1,4-phenylene)bis[4-[(4-methoxyphenyl)methylene]-5(4H)-oxazolone] (PBMBO), was designed and synthesized as a yellow colorant additive for green color filters used in image sensors. The optical and thermal properties of the newly developed material were evaluated both in solution and within color filter film conditions. PBMBO demonstrated a molar extinction coefficient of 2.24 × 104 L/mol·cm in solution, surpassing that of the commercially employed yellow colorant MBIQO by a factor of 1.82. Color resist (CR) films incorporating PBMBO exhibited outstanding

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Harpreet, Kaur, Kaur Harpreet, Vandana Kamboj, and Vandana Kamboj. "Bioremediation of organic dyes using combination of plants ash." Foods and Raw Materials 7, no. 2 (2019): 240–46. http://dx.doi.org/10.21603/2308-4057-2019-1-240-246.

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Water is the most crucial thing to mankind and so its contamination by various agencies is posing a threat to the natural balance. So, in the present work, the efficiency of various adsorbents derived from plant waste, to remove different dyes from aqueous solution was evaluated. Parameters for study were contact time, concentration and pH. Various combinations of plant ashes were used for the study. It was found that adsorbent prepared from the combination of orange peels, pomegranate and banana peels ashes, exhibited good adsorption capacity for methylene blue, congo red and crystal violet.

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Hochma, Efrat, Iryna Hovor, Faina Nakonechny, and Marina Nisnevitch. "Photo- and Sono-Active Food Colorants Inactivating Bacteria." International Journal of Molecular Sciences 24, no. 20 (2023): 15126. http://dx.doi.org/10.3390/ijms242015126.

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Food colorants are commonly used as excipients in pharmaceutical and nutraceutical fields, but they have a wide range of other potential applications, for instance, as cytotoxic drugs or mediators of physical antimicrobial treatments. The photodynamic antibacterial activity of several edible food colorants is reported here, including E127, E129, E124, E122, E133, and E150a, alongside Rhein, a natural lipophilic antibacterial and anticancer compound found in medicinal plants. Minimal inhibitory concentration (MIC) values for S. aureus and E. coli showed that E127 and Rhein were effective agains

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Gheorghe, Viorel, Catalina Gabriela Gheorghe, Andreea Bondarev, Vasile Matei, and Mihaela Bombos. "The Malachite Green Biodegradation in Bioreactors on Various pH Domains." Revista de Chimie 70, no. 8 (2019): 2996–99. http://dx.doi.org/10.37358/rc.19.8.7472.

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In the experimental study was studied the malachite green colorant biodegradation in biological sludge with biological activity. The biodegradability tests were carried out in laboratory bioreactors, on aqueous solutions of green malachite contacted with microorganisms in which the dominant species is Paramecium caudatum, in a pH range between 8 and 12, temperatures in the ranges 25-350C, using pH neutralizing substances and biomass growth promoters. The colorant initial concentrations and those obtained after biological degradation depending on the contact time, at certain pH values, were est

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García, O., A. Costela, I. García-Moreno, C. Gómez, and R. Sastre. "Obtención de nuevos materiales híbridos orgánico-inorgánicos fotosensibles utilizables como láseres de colorante en estado sólido." Boletín de la Sociedad Española de Cerámica y Vidrio 43, no. 2 (2004): 331–36. http://dx.doi.org/10.3989/cyv.2004.v43.i2.533.

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Whitmore, Paul M., Glen R. Cass, and James R. Druzik. "The Ozone Fading of Traditional Natural Organic Colorants on Paper." Journal of the American Institute for Conservation 26, no. 1 (1987): 45. http://dx.doi.org/10.2307/3179660.

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Whitmore, Paul M., Glen R. Cass, and James R. Druzik. "The Ozone Fading of Traditional Natural Organic Colorants on Paper." Journal of the American Institute for Conservation 26, no. 1 (1987): 45–57. http://dx.doi.org/10.1179/019713687806027906.

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Kawakami, Tsuyoshi, Tomoko Obama, Maiko Tahara, and Yoshiaki Ikarashi. "Determination of carcinogenic primary aromatic amines contained as impurities in synthetic organic colorants." Journal of AOAC INTERNATIONAL, August 5, 2022. http://dx.doi.org/10.1093/jaoacint/qsac095.

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Abstract Background Several primary aromatic amines (PAAs) have been designated carcinogenic or suspected of carcinogenicity. Several kinds of PAAs may occur either via the reduction of azo compounds or as impurities in azo colorants or other agents. Objective Analytical method was developed and applied to determine whether certain PAAs are present as impurities in synthetic organic colorants. Methods Target chemicals were analyzed by the ultrasound extraction of the synthetic organic colorant with a hydrochloric acid solution containing 20% methanol, followed by conversion from an acidic to a

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Hansen, Eric F., Arie Wallert, and Michele Derrick. "An Organic Colorant used in Painted Ancient Maya Architectural Sculpture at Nakbe, Peten, Guatemala." MRS Proceedings 462 (1996). http://dx.doi.org/10.1557/proc-462-287.

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ABSTRACTThe ancient Lowland Maya are generally considered to have used a limited number of inorganic colorants in their polychrome reliefs due to the lack or inaccessibility of mineral resources, especially during the Late Preclassic period (300 B.C. – 300 A.D.). A notable exception is the manufacture of a blue pigment from indigo and specific types of clay, known as Maya blue, from the Classic Period (300 – 900 A.D.) through Colonial times. Another exception is a recently analyzed cream (or reddish-yellow) colored paint found on exceptionally large architectural polychrome stuccoed sculpture

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Nabais, Paula, Cecilie Brøns, and Magdalena M. Wozniak. "Investigating Organic Colorants Across Time: Interdisciplinary Insights into the use of Madder, Indigo/Woad, and Weld in Historical Written Sources, Archaeological Textiles, and Ancient Polychromy." Zea Books, 2024. http://dx.doi.org/10.32873/unl.dc.zea.1806.

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Organic dyes have been used from the earliest times to provide color primarily to textiles, but also as a colorant in painting. Such organic dyes could create a wealth of colors, depending on the availability and know-how of resources. These dyes are usually organic in nature, and primarily obtained from different plant sources. Unfortunately, the characterization of natural organic colorants in textiles and artworks is still a challenge. The difficulty of analyzing these materials is sometimes allied to the frequent impossibility of micro-sampling, and the frailty of the objects. Many techniq

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Lombardelli, Claudio, Caterina Mazzocchi, Ilaria Benucci, and Marco Esti. "Stabilized chlorophyll‐based food colorants from spinach: Kinetics of a tailored enzymatic extraction." Journal of Food Science, July 31, 2024. http://dx.doi.org/10.1111/1750-3841.17269.

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AbstractAn organic solvent‐free method based on limited dosing options (biocatalyst and zinc chloride) for the quick and mild recovery of chlorophyll (Chl) from spinach has been proposed. This tailored, custom‐made protocol has been designed to produce stable green natural colorants. The kinetics of pigment extraction turned out to be a very useful tool to identify the proper conditions, in terms of biocatalyst dose (0.10–50 U/g), extraction time (1–48h), and ZnCl2 amount (50–300ppm), both for enhancing the recovery yield and preserving the green color. Considering the extraction kinetics, the

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"Japan: Yamamoto – organic colorants." Focus on Pigments 2006, no. 6 (2006): 5. http://dx.doi.org/10.1016/s0969-6210(06)71022-0.

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"Ciba organic colorants expansion." Additives for Polymers 1995, no. 6 (1995): 10. http://dx.doi.org/10.1016/0306-3747(95)90803-x.

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"European organic colorant markets." Additives for Polymers 1994, no. 10 (1994): 5. http://dx.doi.org/10.1016/0306-3747(94)90382-4.

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