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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27 citations
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TL;DR: In this article, a structural analysis of substituted 3-arylazo-2-hydroxy-6-pyridones was based on the detection of the 2-hydrox-6 pyridone coupling component by reaction of the dye with zinc and resorcinol in dilute ammonia.
27 citations
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TL;DR: In this paper, the phopholipids of erythrocytes were separated by one-dimensional thin-layer chromatography and detemined quantitatively by the molybdenum blue method in the presence of Silica gel HR.
27 citations
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TL;DR: In this paper, the results were applied to 40 substituted phenols, with hexacyanoferrate and peroxosulphate as oxidants, and the main factors that must be taken into account involve the concentration ratio of the 4-aminoantipyrine and the oxidizing agent, their excess relative to phenol, and a buffer solution of sufficient buffering capacity.
Abstract: The reaction of phenols with 4-aminoantipyrine and an oxidizing agent is superior to other colour reactions of phenols because of its sensitivity. It has become the most used reaction for the colorimetric determination of phenols in various materials, but many discrepancies can be found when comparing the results of various authors. Factors influencing the course of the reaction with unsubstituted phenol were investigated in detail, by photometric and chromatographic procedures. The results were applied to 40 substituted phenols, with hexacyanoferrate and peroxosulphate as oxidants. Thus the optimal conditions for a colorimetric procedure could be found. The main factors that must be taken into account involve the concentration ratio of the 4-aminoantipyrine and the oxidizing agent, their excess relative to phenol, and the proper pH range, adjusted by a buffer solution of sufficient buffering capacity. The results obtained explain the discrepancies between the results of previous authors.
27 citations