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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56 citations
TL;DR: Four simple and sensitive visible spectrophotometric methods have been described for the assay of doxorubicin hydrochloride either in pure form or in pharmaceutical formulations and all of the variables have been optimized and the reaction mechanisms presented.
55 citations
TL;DR: In this article, a method for the reduction of sulphate to sulphide by hydriodic and hypophosphorous acids in acetic acid solution is proposed, based on an investigation of the following variables: composition of reducing reagent, composition of the carrier gas and gas-washing liquid, temperature at reduction and time.
55 citations
TL;DR: The Zimmerman color reaction has the disadvantage that chromogens other than 17-ketosteroids react with the Zimmerman reagent, and among the neutral ketonic steroids certain ketones that may be present give atypical colors.
Abstract: THE ZIMMERMAN color reaction has been extensively applied to urinary extracts for the quantitative determination of urinary 17-ketosteroids. It has the disadvantage that chromogens other than 17-ketosteroids react with the Zimmerman reagent. The non-ketonic chromogens of the neutral urinary extracts may be discounted by the use of a color correction equation (1, 2) or by direct chemical removal with measurement only of the ketonic extracts (3, 4). If the non-ketonic chromogens vary qualitatively in their reaction with the Zimmerman reagent then the value of applying a color correction equation is questionable. Among the neutral ketonic steroids certain ketones that may be present give atypical colors; thus 3-ketosteroids give a yellow color and 20-ketosteroids a red color clearly different from the typical pink color of the 17-ketosteroids (4, 5, 6).
53 citations
06 May 2012
TL;DR: A method for estimating ethanol in alcoholic-drinks by direct reaction is presented and the absorbance maxima for the ethanol was found to be 578 nm.
Abstract: A method for estimating ethanol in alcoholic-drinks by direct reaction is presented. The method consist of color reaction of ethanol with sodium dichromate. The colorimetric quantification was based on the formation of green colored chromate ions resulting from treatment of ethanol and sodium dichromate as limiting reactant in presence of sulfuric acid and acetate buffer pH 4.3. The absorbance maxima for the ethanol was found to be 578 nm. The influence of acetate buffer pH, reaction time, and Beer’law on color development and sensitivity were investigated and optimal assay conditions established. The limits of detection and quantification for ethanol were determined to be 0.6 mg/mL and 1.9 mg/mL.
52 citations