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 spectrophotometric method for the determination of neomycin based on the reaction with 2,4-dinitrofluorobenzene was described.
Abstract: A spectrophotometric method is described for the determination of neomycin based on the reaction with 2,4-dinitrofluorobenzene. the best conditions for the reaction were obtained by using 0.02 M borate buffer (pH 9.0) as diluent, under ambient conditions after 50 minutes of reaction.
5 citations
Journal Article•
5 citations
Patent•
05 Mar 1996
TL;DR: The substance FR901,526 is obtained by culturing a strain belonging to the genus Pseudomonas such as Pseudoms sp.907 (FERM P-13,714) at 18-32 deg.C for one day to one week as mentioned in this paper.
Abstract: PURPOSE: To obtain a new compound useful as a therapeutic agent such as human and animal antihypertensive diuretic and bronchodilator, having excellent inhibitory action on c-GMP-PDE. CONSTITUTION: Substance FR901,526 having the following physical and chemical properties. Properties of substance: acidic substance. Melting point: 229-233 deg.C (decomposition). Infrared absorption spectrum: αmax (KBr): 3,270, 1,620, 1,570, 1,370 and 1,280cm . Solubility: soluble in dimethyl sulfoxide, methanol and acetone and insoluble in water. Color reaction: positive in cerium sulfate reaction, ferric chloride reaction and iodine vapor reaction and negative in ninhydrin reaction, Molisch reaction and Ehrlich reaction. The substance FR901,526 is obtained by culturing a strain belonging to the genus Pseudomonas such as Pseudomonas sp.907 (FERM P-13,714) at 18-32 deg.C for one day to one week.
5 citations
TL;DR: In this paper, a highly sensitive spectrophotometric method for determination of cadmium by the chromogenic reagent 2-pyridinediazoaminoazobenzene (Cadion Py) has been developed.
Abstract: A highly sensitive spectrophotometric method for determination of cadmium by the chromogenic reagent 2-pyridinediazoaminoazobenzene (Cadion Py) has been developed. In the presence of Triton X-100 and NH3—NH4Cl buffer solution, the optimum conditions for colour reaction of cadmium with Cadion Py, the molar absorptivity of which is 1.92 × 105 l mol–1 cm–1 at 530 nm, are studied. Elimination of interfering ions at ten-fold concentration is achieved by adding a mixed masking agent. Trace amounts of cadmium in water or waste water samples has been satisfactorily determined by the method.
5 citations
Patent•
19 Sep 2012
TL;DR: In this article, a color reaction-based NO (Nitric Oxide) measuring method is characterized in that through the coordination between rear earth and salicylate, NO is partially oxidized to form a stable cobalt blue nitrogen trioxide in a boosting manner; and qualitative and quantitative analysis of NO are respectively performed according to the it's color features at 600-700 nm and its absorbance when peak wavelength is absorbed.
Abstract: A color reaction-based novel NO (Nitric Oxide) measuring method is characterized in that through the coordination between rear earth and salicylate, NO is partially oxidized to form a stable cobalt blue nitrogen trioxide in a boosting manner; and qualitative and quantitative analysis of NO are respectively performed according to the it's color features at 600-700 nm and its absorbance when peak wavelength is absorbed. The specific method is that butyl acetate and other organic solvents are adopted to absorb or extract the NO, and the mixture of perchloric acid rare earth and the salicylate is added in the solution, after a period of reaction time, whether the NO exists or not, as well as its concentration, can be judged through observing the color of the solution or through measuring the absorbance of the solution at 640 nm. The method provided by the invention is simple and practicable, and is suitable for NO measurement of gases or biological samples.
5 citations