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 method for the direct determination of m-aminophenol in p-aminosalicylic acid and sodium p-aminationosalicylate was developed and is accurate, precise, sensitive, simple, and specific.
5 citations
Patent•
20 Apr 1982
TL;DR: Polysaccharide PS-A isolated from the plant of genus Epimedium violaceum Morr. et al. as mentioned in this paper have the following properties, process for its preparation, and an infection- preventing agent and an immunostimulating agent containing same as an effective ingredient.
Abstract: Polysaccharide PS-A isolated from the plant of genus Epimedium violaceum Morr. et decne. having the following properties, process for its preparation, and an infection- preventing agent and an immunostimulating agent containing same as an effective ingredient: 1. Elemental analysis: C = 40,92, H = 6.17, ash = trace; 2. Molecular Weight: 75,000 + 25,000 (mean molecular weight); 3. Decomposition point: 205°C; 4. pH: 7.0 (100 mg of PS-A in 50 ml of water); 5. Specific rotary power: [α] 19 = -23.6°C (in H 2 O,c = 0.527); 6. IR absorption spectrum: v KBr max (cm -1 ): 3400, 2900, 1620, 1400, 1230, 1060; 7. UV absorption spectrum: no maximum absorptions in 240 to 400 nm; 8. Appearance: white to slightly brown amorphous powder; 9. Solubility: soluble in water, insoluble in methanol, ethanol, acetone, ethyl, acetat, diethyl ether, hexane, and chloroform; 10. Color reaction: positive for the following reactions: (a) anthrone test, (b) Molisch reaction, (c) skatole reaction, (d) Bial reaction; negative for the following reactions: (a) ninhydrin reaction, (b) 2,4-DNP reaction, (c) Selivanoff reaction, (d) naphthoresorcin reaction, (e) carbazole reaction; 11. Constitutive sugar: arabinose and galactose; 12. Uniformity, uniform in ultracentrifugation, electrophoresis, and gel filtration.
5 citations
TL;DR: In this paper, a spectrophotometric and chemical evaluation of reported interferences for three iron reactions for the determinations of serum cholesterol has been presented, and it has been shown that all three reactions are affected by various interfering substances, such as 2-thiouracil, nitrate, azide, bromide, diethylstilbesterol, and steroids.
5 citations
Patent•
27 Jun 2012
TL;DR: In this article, a color reagent made from colorimetry nanometer material and used for high sensitively and high selectively detecting melamine and application of the colour reagent is presented.
Abstract: The invention provides a color reagent made from colorimetry nanometer material and used for high sensitively and high selectively detecting melamine and application of the color reagent. A main body of the color reagent is formed by a metal nanometer material which is in single or composite composition, and the obtained metal nanometer material can be used for carrying out a color reaction with a melamine solution under the condition that a corrosive reagent of the metal nanometer material exists. A water-soluble metal nanometer optical probe manufactured by the color reagent disclosed by the invention has a stronger plasma resonance absorption effect in a visible region, the optical probe which is used as the color reagent has a highly-sensitive selectivity response for the melamine, the lowest concentration which can be detected by a visual method can be 0.6nM, and the visual method is the method with the lowest detection limit in the colorimetry reported at present. Compared with the method for detecting the melamine with the metal nanometer material reported at present, the method provided by the invention has the advantages that: the nanometer material does not need to be specially modified, and thus the method is more simple and convenient. The method provided by the invention is hopeful to be used for the simple, convenient and efficient detection for the melamine in food comprising milk products in liquid state or solid state.
5 citations
5 citations