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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 new color reaction of [Ru(Hedta)(H2O)] with some compounds that contain groups C−SH or C=S has been found Alkanethiols, cysteine, thiourea and thiosulfate showed blue color.
Abstract: A new color reaction of [Ru(Hedta)(H2O)] with some compounds that contain groups C–SH or C=S has been found Alkanethiols, cysteine, thiourea and thiosulfate assume pink to reddish brown color, while benzenethiols show blue color It was suggested that the coloration is due to the anation of [Ru(Hedta)(H2O)] with sulfur-containing compounds
2 citations
Patent•
17 Feb 1981
TL;DR: In this paper, the presence of theophylline in a liquid, such as a body fluid, can be determined, quantitatively or qualitatively, by a colour reaction, in which the polygonal acid is converted to the theophylline by reaction with an alkali such as sodium or potassium hydroxide at an elevated temperature and, after neutralization of the alkali with an organic acid, the polyphylline formed is coupled with a chromogen to yield a colour whose depth is proportional to the PH concentration in the body fluid being tested.
Abstract: The presence of theophylline in a liquid, such as a body fluid, can be determined, quantitatively or qualitatively, by a colour reaction. The theophylline is converted to theophyllidine by reaction with an alkali such as sodium or potassium hydroxide at an elevated temperature and, after neutralization of the alkali with an organic acid, the theophyllidine formed is coupled with a chromogen to yield a colour whose depth is proportional to the theophylline concentration in the body fluid being tested. Hitherto the requirement for an elevated temperature has required the use of external heat; in the invention there is used a solid alkali which generates heat of solution for the heating step; there may also be used a noncorrosive acid for the neutralization. A tetrazo chromogen yields a bright, relatively stable purple colour. The test can be carried out on, for instance, blood or saliva samples in a simple and effective manner.
2 citations
TL;DR: In this article, a new water soluble chromogenic reagent, 2-(5-bromo-pyridylazo)-5-[(N,N-dicarboxylmethyl)amino]-phenol has been synthesized.
Abstract: A new water soluble chromogenic reagent, 2-(5-bromo-pyridylazo)-5-[(N,N-dicarboxylmethyl)amino]-phenol has been synthesized. Its colour reaction with various metal ions was tested, and the acid dissociation constant of the reagent, and the stability constants of the chelates of Ni2+, Co2+, Cu2+, Mn2+, Pb2+, Zn2+ and UO
2
2+
were determined. The application of the reagent to spectrophotometric determination of nickel in irons is presented.
2 citations
2 citations
Patent•
01 Jun 1985
TL;DR: In this article, a bacterium belonging to the genus Flavobacterium chitinovorum sp. nov. (FERM-P 7085) is newly separated from soil.
Abstract: PURPOSE:To obtain novel antibiotic chitinovorin-A and chitinovorin-B having antibacterial action on Gram-positive and Gram-negative bacteria, by cultivating a bacterium belonging to the genus Flavobacterium. CONSTITUTION:Flavobacterium chitinovorum sp. nov. (FERM-P 7085) is newly separated from soil. The mold is aerobically cultivated in an ordinary medium, to give novel antibiotic chitinovorin-A and chitinovorin-B. Both of them havin the following properties. Appearance: colorless powder. Solubility in solvent: soluble in water and dimethyl sulfoxide, slightly soluble or insoluble in other organic solvent. Color reaction: positive in ninhydrin reaction. Distinction of basicity, acidity, and neutrality: basic substance having amphoteric properties. Found value of elemental analysis of diacetyl-substituted derivative of them: C, 46.28, H, 6.89, N, 16.2, S, 4.35.
2 citations