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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.


Papers
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Journal ArticleDOI
TL;DR: Using as reagents potassium dichromate and concentrated sulfuric acid, a rapid, simple method for the assay of alkaloids has been developed, and the green color produced absorbs maximally at 650 mμ, is stable for at least 72 hours, and is insoluble in benzene, chloroform, carbon tetrachloride, and other organic solvents.

2 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that D-homogenization of 17α-hydroxyprogesterone (1) in 80% sulfuric acid gave two Dhomosteroids through C (13)-C (17) bond migration, 17aβ-hydrox-17aα-methyl-D-homoandrost-4-ene-3.
Abstract: Dissolution of 17α-hydroxyprogesterone (1) in 80% sulfuric acid gave two D-homosteroids through C (13)-C (17) bond migration, 17aβ-hydroxy-17aα-methyl-D-homoandrost-4-ene-3, 17-dione (2) and 17a-methylene-D-homoandrost-4-ene-3, 17-dione (3), in 53 and 9% yields, respectively. The latter product was also obtained in 73% yield from the reaction of 1 with 90% sulfuric acid. Proton nuclear magnetic resonance (1H-NMR) studies of the acid solutions revealed that the D-homoannulation of 1 to 2 occurs rapidly even in 80 or 90% sulfuric acid, and that 2 is dehydrated rapidly to 3 in 90% sulfuric acid. The D-homoannulation was demonstrated to be an initial step in the color and fluorescence reaction of 1 with sulfuric acid.

2 citations

Patent
16 Apr 1993
TL;DR: In this article, a new compound capable of exhibiting remarkable enzyme- inhibiting activity against casein kinase II and useful as an antitumor agent was obtained by inoculating a microorganism belonging to the genus Pseudorobillarda sp. F26668 into a nutrient source-containing medium and culturing the micro-organism under aerobic conditions.
Abstract: PURPOSE: To obtain a new compound capable of exhibiting remarkable enzyme- inhibiting activity against casein kinase II and useful as an antitumor agent. CONSTITUTION: A compound of the formula or its salt. This compound is obtained by inoculating a microorganism belonging to the genus Pseudorobillarda sp. or its variant (FERM P-13325), e.g. Pseudobillarda sp. F26668 into a nutrient source-containing medium and culturing the microorganism under aerobic conditions, harvesting the cultured mixture from the bacterial cell by normal separation means and separating and purifying the cultured product. Properties of the compound of the formula: Appearance, pale yellow solid; molecular formula, C 13 H 10 O 5 ; solubility, readily soluble in acetone, methanol and ethyl acetate and sparingly soluble in chloroform and water and insoluble in hexane; discrimination of acidic, neutral or basic substance, acidic substance; Rf value, 0.43 (using 'Kiesel gel 60F 254 (R)' manufactured by Merck & Co., Inc. and developed using chloroform/methanol); color reaction, positive to iodine reaction and molybdophosphoric acid reaction and negative to ninhydrin reaction. COPYRIGHT: (C)1994,JPO

2 citations

Patent
19 Jan 1987
TL;DR: A mildewproofing agent and an agent for alleviating candidiasis using Streptomyces platensis CA-31 (FERM P-8313) is described in this paper.
Abstract: NEW MATERIAL:Antibiotic CA-31 shown by the formula having the following physical and chemical properties. Light yellow amorphous powder. Molecular weight: MS m/z(M+H) 415. Color reaction: positive in Ehrlich reagent. Solubil ity: soluble in water, DMF, dimethyl sulfoxide, slightly soluble in methanol and ethanol, and insoluble in chloroform, dichloromethane, benzene, ether, etc. USE:A mildewproofing agent and an agent for alleviating candidiasis. PREPARATION:A mold [e.g., Streptomyces platensis CA-31 (FERM P-8313), etc.,] belonging to the genus Streptomyces is cultivated preferably by liquid culture at 25-30 deg.C usually for 40-120hrs.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20227
20214
20206
20198
20186
20175