Topic
Color reaction
About: Color reaction is a research topic. Over the lifetime, 1194 publications have been published within this topic receiving 19579 citations.
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TL;DR: Of the natural urea derivatives at present known, citrulline is the only one that gives a red, carbamido diacetyl reaction; urea, itself, gives a yellow colour; allantoin and allantoic acid give varying in shades orange-pink, probably due to urea liberated under the conditions of the test ; cyclic ureides do not react chromatically.
Abstract: SAMPLES of baker's yeast that have undergone autolysis in presence of toluene or chloroform give an intense red colour reaction when boiled with diacetyl in hydrochloric acid, which is characteristic of compounds of the type1 —CH2NH—CO—NH2. Of the natural urea derivatives at present known, citrulline is the only one that gives a red, carbamido diacetyl reaction; urea, itself, gives a yellow colour ; allantoin and allantoic acid give varying in shades orange-pink, probably due to urea liberated under the conditions of the test ; cyclic ureides do not react chromatically. Hence, it was assumed at first that the yeast reaction was due to citrulline, originally present as a unit, or arising from arginine by desimidation.
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TL;DR: The significance of the dinitrobenzoic acids in the Mohler reaction for the estimation of benzoic and of mononitrobenzosic acids has been demonstrated by an approach by synthesis as discussed by the authors.
Abstract: The significance of the dinitrobenzoic acids in the Mohler reaction for the estimation of benzoic and of mononitrobenzoic acids has been demonstrated by an approach by synthesis. The colour reaction is given only by dinitrobenzoic acids with two nitro groups ortho or para to each other. Further support has been obtained for the hypothesis of Meisenheimer & Patzig that colour development from compounds of this type is due to the formation of quinonoid structures.
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TL;DR: In this paper, a new indicator tube developed as an application of this reaction will be used conveniently for the detection of nitrogen dioxide in the field of industrial hygiene, which can be used for the purpose of detecting nitrogen dioxide.
Abstract: Polyvinylcarbazole reacts selectively with nitrogen dioxide and develops a yellow color The color producing components are identified to be nitro derivatives of the polymer A new indicator tube developed as an application of this reaction will be used conveniently for the detection of nitrogen dioxide in the field of industrial hygiene
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