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: A new colorimetric method is presented based on the determination of 2-oxoglutaric acid formed in the enzyme reaction by means of the previously established selective color reaction of the acid, suitable to assay a large number of samples with a wide range of activity at the same time.
Abstract: A new colorimetric method is presented for the determination of serum isocitric dehydrogenase activity. This is based on the determination of 2-oxoglutaric acid formed in the enzyme reaction by means of the previously established selective color reaction of the acid. The method gives reliable results and is suitable to assay a large number of samples with a wide range of activity at the same time with 50μl of sample.
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TL;DR: The results of the aldehydet determination in photographic gelatin by colour reaction with thiobarbituric acid are influenced by the composition of the solvent used for the reaction and are not specific characteristics of the analyzed gelatin this article.
Abstract: The yield of the gelatin-thiobarbituric acid reaction depends on the water content of the solvent. Under these conditions the results of the aldehydet determination in photographic gelatin by colour reaction with thiobarbituric acid are influenced by the composition of the solvent used for the reaction and are not specific characteristics of the analyzed gelatin.
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13 Feb 1982
TL;DR: In this paper, Sclerotia of tuckahoe in Basidiomycetes are cultured to produce mycelia and the mycellia are extracted with water or aqueous alkali and subjected to specific fractionation operation to give β-D-glucan with high antitumor activity.
Abstract: PURPOSE: Sclerotia of tuckahoe in Basidiomycetes are cultured to produce mycelia and the mycelia are extracted with water or aqueous alkali and subjected to specific fractionation operation to give β-D-glucan with high antitumor activity. CONSTITUTION: Sclerotia of tuckahoe in Basidiomycetes (FERM-4766) are cultured and the resultant mycelia are extracted with water or aqueous alkali and the extract is fractionated to give β-D-glucan. The resultant β-D-glucan has following properties: causing color reaction as a saccharide in the phenol-sulfuric acid reaction, anthrone-sulfuric acid reaction, α-naphthol-sulfuric reaction and orcinol-sulfuric acid reaction; molecular weight of 2,000,000W6,000,000 according to the light-scattering method; specific rotatory power, -10°W-50°; when the molar number of the nonreductive terminal G 1 - (G stands for glucose) is set to 1, the mole number of - 3 G 1 - is 2.5W7, that of - 3 G 1 6 - is 0.5W2.5, - 3 G 1 4 - is 0W0.4 and 6 G 1 - is 0.3W2.5. COPYRIGHT: (C)1983,JPO&Japio
1 citations
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29 Aug 1984
TL;DR: A color reaction adjuvant may be added to a brush pen, a sponge or the like for supplying water for color developing, discoloration or decolorization at the time of use as mentioned in this paper.
Abstract: PURPOSE:To obtain a printed matter such as a question book in which an answer is checked when required, a color-changing glass or the like, by printing in an ink containing a color reaction agent which is colorless or forms a color when being dried and forms a color, is discolored or decolorized when being supplied with water, and a color reaction adjuvant. CONSTITUTION:A pH indicator for indicating a pH range for a color reaction, a discolorable coloring matter for indicating the pH range, a flavonoid coloring matter showing a color change upon a redox reaction or presence or absence of a substituent group in addition to a change of pH, or the like is used as a color reaction agent, while an acidic, basic or neutral compound capable of adjusting pH and/or a reducing agent or the like is used as a color reaction adjuvant. The color reaction agent and the color reaction adjuvant are dissolved in a solvent such as water or an alcohol, to which a thickener or the like is added, and the resultant material is used as an ink for printing. The color reaction adjuvant may be mixed with the color reaction agent, or may be infiltrated into a material to be printed in the form of a separate solution. Further, the color reaction adjuvant may be added to a brush pen, a sponge or the like for supplying water for color developing, discoloration or decolorization at the time of use.
1 citations