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: A statistical comparison of several conventional techniques with the new reaction revealed no significant contribution of other sulfhydryl compounds to the results obtained by the methods of Medes and Padis or Shinohara but the method of Sullivan was found to be inaccurate.
9 citations
01 Jan 2016
TL;DR: The use of 4-amino antipyrine as a reagent for the simple and rapid determination of phenols was discussed in this paper, where it was shown that it can be used for the determination of certain preservatives, germicides, and other similar compounds.
Abstract: there was a need for a rapid method for the determination of phenol. A rapid method would provide the information required as a guide for subsequent treatments and would make possible the analysis of a large number of samples. From a review of the literature, it was believed that a method based on the reaction of 4-aminoantipyrine reagent with phenol might be readily applied to this problem. The purpose of the present paper is to present additional information on the use of 4-amino antipyrine as a reagent for the simple and rapid determination of phenols. In 1943 Emerson (3) reported that in alkaline solutions phenols react with 4-aminoantipyrine in the presence of oxidizing agents to form intensely col ored compounds. He also pointed out the structural requirements that must be met by the phenolic compounds if the color reaction is to take place and listed a large number of organic com pounds and their reactions with 4 aminoantipyrine. The aminoantipyrine reaction was used by Gottlieb and Marsh (6) as the basis for the determination of certain preservatives, germicides, and other similar phenolic compounds. These same authors also presented absorption curves of the color produced with the various compounds, in addition to a detailed procedure.
9 citations
TL;DR: On heating with hydroxylamine and on subsequent treatment with ferric chloride, pyrrolidonecarboxylic acid gives a colour reaction as mentioned in this paper, which can be used for the quantitative estimation of glutamic acid in protein hydrolyzates.
9 citations
9 citations
01 Dec 1995
TL;DR: A method for determination of ammonia-N in environmental water by air-segmented flow injection analysis using the colour reaction of phenol and sodium hypochlorite with ammonia was described in this paper.
Abstract: A method for determination of ammonia-N in environmental water by air-segmented flow injection analysis using the colour reaction of phenol and sodium hypochlorite with ammonia was described in this paper. When the reaction temperature is 70℃ and the reaction residence time is 5 minutes, a sample frequency of 60 - 90 h^(-1) can be achieved. The detection limit and relative deviation are 0.05 ㎎.ml^(-1) and 4%, respectively. The recovery of this method is 96 - 110%, and the determination results of the method are greatly agreement with standard colorimetric method.
9 citations