scholarly journals The chemistry of synthetic dyes and pigments

1956 ◽  
Vol 33 (1) ◽  
pp. 50
Author(s):  
Edward R. Atkinson
Keyword(s):  
Synthetic Dyes ◽  
Dyes And Pigments

scholarly journals Bacterial decolourization of azo dyes

2017 ◽  
Vol 16 (4) ◽  
pp. 1-12
Author(s):  
Amrita Nair ◽  
Nandini Rajendhiran ◽  
R Varsha ◽  
Biljo V Joseph ◽  
V L Vasantha
Keyword(s):  
Azo Dyes ◽  
Organic Contaminants ◽  
Control Strategies ◽  
Textile Effluent ◽  
Health Concern ◽  
Synthetic Dyes ◽  
Chemical Methods ◽  
Physico Chemical ◽  
Pure Cultures ◽  
Dyes And Pigments

Release of textile effluent into the environment is a matter of health concern. Dyes and pigments that are part of textile effluent generate hazardous wastes which are generally inorganic or organic contaminants. Among the present pollution control strategies, biodegradation of synthetic dyes by microbes is evolving as a promising approach, even more than physico-chemical methods. While both mixed cultures and pure cultures have been used to achieve efficient biodegradation, no conclusive result has been determined. This paper aims at checking the efficiency of mixed culture of sewage and pure isolates in degradation of azo dyes, both simple dyes like methyl red and methyl orange and a more complex dye like Janus green.

Application of violet pigment from Chromobacterium violaceum UTM5 in textile dyeing

Biologia ◽  
2016 ◽  
Vol 71 (2) ◽  
Author(s):  
Chidambaram K. Venil ◽  
Nur Z. Yusof ◽  
Claira A. Aruldass ◽  
Wan-Azlina Ahmad
Keyword(s):  
Green Chemistry ◽  
Chromobacterium Violaceum ◽  
Natural Dyes ◽  
Synthetic Dyes ◽  
Violet Pigment ◽  
Textile Dyeing ◽  
Dyes And Pigments

AbstractNatural dyes and pigments are emerged as an important alternative to potentially harmful synthetic dyes. There is a growing demand for eco-friendly/non-toxic colourants specifically for textile dyeing because of its sustainability, green chemistry and improved eco-balances. The present study aimed to evaluate the dyeing potential of violet pigment from

scholarly journals Dyes and pigments used in foods: an integrative literature review

2021 ◽  
Vol 10 (10) ◽  
pp. e316101018925
Author(s):  
Micael Estevão Pereira de Oliveira ◽  
Wildson Max Barbosa da Silva ◽  
Daniela Ribeiro Alves ◽  
João Batista de Andrade Neto ◽  
Selene Maia de Morais ◽  
...  
Keyword(s):  
Large Scale ◽  
Biological Activities ◽  
Data Extraction ◽  
Future Perspective ◽  
Synthetic Dyes ◽  
Consumer Market ◽  
Natural Pigments ◽  
Food Dyes ◽  
Selection Of ◽  
Dyes And Pigments

The food colors are, in many countries, widely used to give food increased visual sensory quality, aiming, thus, the growth of the consumer market. Aware of this, the present work aimed to reevaluate the general properties of synthetic food dyes and natural pigments, the latter being generally used to replace the former. Then, the current analysis was based on the search for the strategy, selection of articles (with inclusion and exclusion criteria), eligibility, and data extraction. Thus, it was observed in studies that synthetic food dyes may cause several harmful effects to human health, among them, genetic damage and carcinogenicity. On the other hand, the use of natural pigments as an alternative to replace food dyes has been increasingly present in studies, presenting qualities that, previously, were not known, as is the case of anthocyanins, which have important physiological and ecological functions. It is also important to point out that the use of natural pigments goes beyond the limits of food, and are also found as sensitizers for solar cells, tissues, and medicines. Selected articles (47) leaded to a total of 72 distinct pieces of information, focused mainly on the biological activities and involving natural dyes and pigments. In short, the gradual replacement of dyes, currently used, still in large scale in some locations, by natural pigments, is already part of our present, allowing the creation of a future perspective with the production of processed foods without the damage that most of synthetic dyes produce to the human body.

scholarly journals NATURAL DYES EXTRACTED FROM WASTE LEAVES OF TERMINALIA CATAPPA LOCALLY KNOWN AS TROPICAL ALMOND AND ITS APPLICATION ON SILK FABRICS PRETREATED WITH ECO FRIENDLY AND NONECO-FRIENDLY MORDANTS

2017 ◽  
Vol 5 (5) ◽  
pp. 125-137 ◽  
Author(s):  
Yogesh Vadwala ◽  
Namrita Kola
Keyword(s):  
Natural Resources ◽  
Environmental Pollution ◽  
Waste Product ◽  
Natural Dye ◽  
Natural Dyes ◽  
Synthetic Dyes ◽  
Fastness Properties ◽  
Terminalia Catappa ◽  
Silk Fabrics ◽  
Dyes And Pigments

The use of non-toxic and eco-friendly natural dyes on textiles has become a matter of significant importance because of the increased environmental awareness in order to avoid some synthetic dyes. Synthetic dyes are hazardous and carcinogenic and also release vast amount of pollutant in the environment during their manufacture and application, thus revival of natural dyeing techniques as one of the alternative is being emphasized for this purpose. Most effective ways for reducing environmental pollution is the replacement of polluting materials and chemicals by eco-friendly natural materials. Many natural resources which are being wasted indiscriminately or thrown away as a waste product contain useful dyes and pigments. In the present study, natural dye extracted from the waste leaves of Terminalia Catappa (tropical almond) and its application on silk fabrics pretreated with eco-friendly and non-eco-friendly mordants have been carried out successfully. Different shades with excellent to good fastness properties have been obtained.

scholarly journals Experimental Researches Regarding the Ecological Dyeing with Natural Extracts

2014 ◽  
Vol 14 (4) ◽  
pp. 290-298 ◽  
Author(s):  
Ramona Budeanu ◽  
Antonela Curteza ◽  
Cezar Doru Radu
Keyword(s):  
Textile Industry ◽  
Black Tea ◽  
Natural Fibres ◽  
Synthetic Dyes ◽  
Natural Extracts ◽  
Dyeing Process ◽  
Wide Range ◽  
Experimental Researches ◽  
Food Substrate ◽  
Dyes And Pigments

Abstract The concept of ‘environmental awareness’ has recently had a major impact on the textile industry and on the fashion world as well. In this context, the use of natural fibres and the development of natural dyeing processes gradually became important goals of the textile industry. Of all natural textile fibres, hemp is considered to be one of the strongest and most durable. A wide range of natural extracts have been used for natural textile coloration and dyeing. Dyes deriving from natural sources have emerged as an important alternative to synthetic dyes. Ecofriendly, nontoxic, sustainable and renewable natural dyes and pigments have been used for colouring the food substrate, leather, wood, natural fibres and fabrics from the dawn of human history. The purpose of the research is to obtain ecologically coloured fabrics for textiles by using a method of dyeing that relies on natural ingredients extracted from red beet, onion leaves and black tea. The experiments are conducted on three different types of hemp fabrics. This paper presents the results of the studies regarding the dyeing process of hemp fabrics with natural extracts, the colours of the dyed samples inspected with reflectance spectra and the CIE L*a*b* colour space measurements.

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