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: In this paper, the effect of radicals attached to the nitrogen atom and the influence of neutralization of a carboxyl group in the alpha position on the reaction of Asteric acid was investigated.
Abstract: SummaryAscorbic acid reacts with formation of yellow color with nicotinamide, nicotinic acid, and a number of other derivatives of pyridine. In general, a radical other than the methyl group attached to the alpha-carbon atom interferes with the reaction. Similar conditions were observed in the case of the piperidines, quinolines, and iso-quinolines that were investigated. The effect on the reaction of radicals attached to the nitrogen atom and the influence of neutralization of a carboxyl group in the alpha position are discussed.
2 citations
TL;DR: In this paper, the synthesis of a thiocarbazone for the selective determination of Cu2+ in distilled beverages was described, and a method was based on the complexation reaction of the Cu2 + with the Thiocarbazone, and the colored product was analyzed using a smartphone application.
2 citations
TL;DR: In this paper, the color reaction between anisole, concentrated sulphuric acid and formaldehyde has been studied in glacial acetic acid as a solvent for quantitative colorimetric analysis.
2 citations
Journal Article•
TL;DR: In this article, the conditions for spectrophotometric analysis of total flavonoids in apple fruit were optimized under optimized conditions, and the results indicated that catechin was suitable standard substance; the suitable detection wavelength was 500 nm; anyone of AlCl3, Al (NO3)3 and Al2 (SO4)3 could be used for color reagent; the stability of color reaction at 4 ℃ was better than those at 25 ℂ and 40℃.
Abstract: Fruits of cultivars Fuji, Red Delicious, Golden Delicious and Ralls Janet were used to optimize the conditions for spectrophotometric method of total flavonoids in apple fruit. The results indicated that catechin was suitable standard substance; the suitable detection wavelength was 500 nm; anyone of AlCl3, Al (NO3)3 and Al2 (SO4)3 could be used for color reagent; the stability of color reaction at 4 ℃ was better than those at 25 ℃ and 40℃; 8% was appropriate ethanol concentration in the color reaction system. Under optimized conditions, there was a good linearity at concentrations from 50 mg·L-1 to 300 mg·L-1 with correlation coefficient greater than 0.999; catechin recoveries in peel were 100.8% to 104.9% (fortified 3 804 to 6 410 mg·kg-1, and 104.7% to 105.0% in pulp (fortified 500 mg·kg-1 or 1 000 mg·kg-1);relative standard deviations of the method were no more than 5.0%.
2 citations
Patent•
03 Jun 1985
TL;DR: In this article, a thiourea derivative is mixed as a color developer with an electron-donative color reaction organic compound and a desensitizer such as an alcohol.
Abstract: PURPOSE:To provide the titled composition free of or low in toxicity, unlimited in use and showing stable thermal color-changeability even when being repeatedly used for a long period of time, wherein a thiourea derivative is mixed as a color developer with an electron-donative color reaction organic compound and a desensitizer such as an alcohol CONSTITUTION:The objective composition is obtained by mixing (A) an electron- donative color reaction organic compound, preferably, crystal violet lactone or the like, as a color former, (B) a compound selected from thiourea and derivatives thereof, eg, thiourea, as a color developer, and (C) a compound selected from alcohols, esters, ketones, ethers, acid amides and carboxylic acids, preferably, cyclohexane or the like, as a desensitizer The components are used in an A:B:C weight ratio of 1:1/2-50:1-50
2 citations