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 article, a new color reaction for detecting citric and tartaric acids in vinegar has been developed, which can detect traces of citric (2 μg) and tarsic acid (5 μg) in concentrated acetic and formic acids.
1 citations
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TL;DR: The color reaction of sulfide with p-diethylamino phenylamine to form ethyl thionine has been studied in this paper, where the addition of sodium dodecyl sulfonate could enhance the sensitivity of the reaction.
Abstract: The color reaction of sulfide with p-diethylamino phenylamine to form ethyl thionine has been studied. The addition sodium dodecyl sulfonate could enhance the sensitivity of the reaction. The maximum absorption of the association compound was at 675 nm and the molar absorptivity was 4.25×10~4 L·mol~(-1)·cm~(-1). The Beer's law was obeyed in the range of 0~0.8 μg/mL. The present method has been applied to the determination of sulfide in natural water with satisfactory results.
1 citations
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TL;DR: Two main coloring matters were isolated in crystalline forms in the color reaction of formaldehyde and diazotized sulfanilamide as mentioned in this paper, and they were identified as 1, 3, 5-tri-(p-sulfamo yr) phenylformazan and 1, 5 -di-(p -sulfamoyl), respectively.
Abstract: Two main coloring matters were isolated in crystalline forms in the color reaction of formaldehyde and diazotized sulfanilamide. Their structures were determined as 1, 3, 5-tri-(p-sulfamo yr) phenylformazan and 1, 5-di-(p-sulfamoyl) phenylformazan.Similarly, two main coloring matters of the reaction of formaldehyde with diazotized p-aminobenzoic acid were obtained as their methyl esters. They were identified as 1, 3, 5-tri-(p-carbomethox y) phenylformazan and 1, 5-di-(p-carbomethoxy) phenylformazan.
1 citations
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08 Jan 1991
TL;DR: A compound, expressed by the formula and having following physicochemical properties Appearance: colorless crystal; molecular weight: FD-MS m/z 819(M+H) Elementary analysis (%); C, 6654; H, 929; O, 2406 Molecular formula; C46H74O12 Melting point; 1570-1590 degC Specific rotatory power; [alpha] =-470 (C=100 methanol) Solubility; soluble in methanols, acetone, ethyl acetate, dimethylsulfoxide
Abstract: NEW MATERIAL:A compound, expressed by the formula and having following physicochemical properties Appearance: colorless crystal; Molecular weight: FD-MS m/z 819(M+H) Elementary analysis (%); C, 6654; H, 929; O, 2406 Molecular formula; C46H74O12 Melting point; 1570-1590 degC Specific rotatory power; [alpha] =-470 (C=100 methanol) Solubility; soluble in methanol, acetone, ethyl acetate, dimethylsulfoxide, etc, and slightly soluble in water, hexane, etc Color reaction; positive to phosphorus-molybdic acid reaction, sulfuric acid and potassium permanganate reaction, negative to the Pauly reaction and Rydon- Smith reaction, etc USE:An antifungal, antitumor agent, vascularization inhibitor or vermicide PREPARATION:A bacterium strain belonging to the genus Streptomyces such as Streptomycesbottropensis NK86-0279 (FERM BP-1785) is cultured at 25-30 degC for 3-6 days under neutral-slightly acidic conditions
1 citations