Topic
Xanthene
About: Xanthene is a research topic. Over the lifetime, 2132 publications have been published within this topic receiving 34803 citations. The topic is also known as: Xanthene & dibenzo[a,e]pyran.
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TL;DR: In this article, water-soluble acid dyes were quantitatively extracted from water and various carbonated beverages into a 0.1 M quinine-chloroform solution in the presence of boric acid by brief shaking.
Abstract: Twenty-one water-soluble acid dyes, including eleven azo, five triphenylmethane four xanthene, one naphthol derivatives, used at practical concentrations for food coloration, were quantitatively extracted from water and various carbonated beverages into a 0.1 M quinine-chloroform solution in the presence of 0.5 M boric acid by brief shaking. Quantitative extraction of these dyes was also accomplished by the 0.1 M quinine-chloroform solution made conveniently from chloroform, quinine hydrochloride, and sodium hydroxide added successively to water or beverages containing boric acid. Quinine acted as a countercation on the dyes having sulfonic and/or carboxylic acid group(s) to form chloroform-soluble ion-pair complexes. The diacidic base alkaloid interacted with each acid group of mono-, di-, tri-, and tetrasulfonic acid dyes approximately in the ratio 0.8-0.9 to 1. The dyes in the chloroform solution were quantitatively concentrated into a small volume of sodium hydroxide solution also by brief shaking. The convenient quinine-chloroform method was applicable to the quantitative extraction of a mixture of 12 dyes from carbonated beverages, which are all currently used for food coloration. A high-pressure liquid chromatographic method is also presented for the systematic separation and determination of these 12 dyes following their concentration into the aqueous alkaline solution. The chromatogram was monitoredmore » by double-wavelength absorptiometry in the visible and ultraviolet ray regions.« less
3 citations
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05 Jun 1996TL;DR: Reactive dyes of formula (I), which contain triazinylamino gps. linked by polyoxypropylene chain, are new; A1, A2 = the residue of a mono-, poly- or metal complex azo, anthraquinone, phthalocyanine, formazan, azomethin, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone, nitroaryl, naphthoquinone or perylenetetracarbimide
Abstract: Reactive dyes of formula (I), which contain triazinylamino gps. linked by polyoxypropylene chain, are new; A1, A2 = the residue of a mono-, poly- or metal complex azo, anthraquinone, phthalocyanine, formazan, azomethin, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide dye; R1, R2, R3, R4 = H or opt. substd. 1-4 C alkyl; Y1, Y2 = halogen, carboxypyridinium, opt. substd. amino or a heterocyclic gp. attached by a N atom; n = 1-7. Also claimed are mixts. of at least 2 dyes (I).
3 citations
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04 Jul 2019TL;DR: In this article, the xanthan-based compound can be used as a coloring material in the photosensitive resin composition, and a color filter and a display device are provided.
Abstract: Provided is a xanthan-based compound which has a novel structure and is represented by chemical formula 1. Also, provided are a photosensitive resin composition including the same, a photosensitizing material produced by using the same, a color filter, and a display device. According to an embodiment of the present invention, the xanthan-based compound can be used as a coloring material in the photosensitive resin composition.
3 citations
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TL;DR: In this article, the lightfast of red xanthene and blue azine and triphenylmethane dyes in mixtures with azo dyes of 1-phenyl-3-methyl-5-pyrazolone in the polymer films from cellulose acetobutirate were studied.
Abstract: Lightfast of red xanthene and blue azine and triphenylmethane dyes in mixtures with azo dyes of 1-phenyl-3-methyl-5-pyrazolone in the polymer films from cellulose acetobutirate were studied.
3 citations