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Organic Chemistry

Colorants and Auxiliaries: Organic Chemistry and Application by J. Shore

By J. Shore

Concentrates at the chemical features of dyes and pigments, with emphasis on makes an attempt to interpret their colouring and fastness houses when it comes to the fundamental structural beneficial properties of colorant molecules.

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Additional info for Colorants and Auxiliaries: Organic Chemistry and Application Properties: Colorants

Sample text

There is as yet no agreed international list of permitted food colours. Thus a food dye that is permitted in one country may be considered unacceptable in another. 8 [60]. All were originally introduced as acid dyes for wool many years ago. Furthermore, more than thirty colorants of natural origin are permitted in most countries. The natural carotenoid dyes are of outstanding importance for colouring edible fats and oils. pmd EU No Colorant CI Food CI Acid Chemical class E102 E104 E110 E122 E123 E124 E127 E131 E132 E142 E151 Tartrazine Quinoline Yellow Sunset Yellow Carmoisine Amaranth Ponceau 4R Erythrosine Patent Blue V Indigo Carmine Green S Black PN Yellow 4 Yellow 13 Yellow 3 Red 3 Red 9 Red 7 Red 14 Blue 5 Blue 1 Green 4 Black 1 Yellow 23 Yellow 3 Monoazo Quinophthalone Monoazo Monoazo Monoazo Monoazo Xanthene Triarylmethane Indigoid Triarylmethane Disazo 29 Red 14 Red 27 Red 18 Red 51 Blue 1 Blue 74 Green 50 15/11/02, 14:41 30 CLASSIFICATION AND GENERAL PROPERTIES OF COLORANTS fungi, insects, bacteria, feathers and egg yolks [61].

Since their commercial introduction during the 1940s as components of proprietary detergents and laundry preparations, these products have found extensive usage in the whitening of paper and textile materials. Disperse FBAs are available for whitening hydrophobic fibres and solvent-soluble FBAs impart fluorescence to oils, paints, varnishes and waxes. Approximately 75% of commercially established FBAs are stilbene derivatives with inherent substantivity for paper and cellulosic textiles, but the remainder come from about twenty different chemical classes.

Consequently, in many instances it is not possible to be fully confident of the reliability of the risk assessment, which may tend to be in error on the side of overestimation. Particular attention should be given to improving aspects of exposure assessment (occupational exposure, consumer exposure, environmental release) [70]. The widespread use of colorants creates a great diversity of exposure situations. The most serious exposure potential exists for operatives in colorant manufacture and those employees of dye user firms engaged in weighing and dispensing dyes.

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