منابع مشابه
Reactions of Xanthydrol
The method to be described for the determination of tryptophan is based on the reaction between xanthydrol and tryptophan in acid solution to form a highly colored, acid-stable product (1). In the presence of excess xanthydrol the formation of xanthydryltryptophan is directly related to the quantity of tryptophan in the solution. Although other indole derivatives likewise react with xanthydrol ...
متن کاملRealizing structural color generation with aluminum plasmonic V-groove metasurfaces.
Structural color printing based on all-aluminum plasmonic V-groove metasurfaces is demonstrated under both bright field and dark field illumination conditions. A broad visible color range is realized with the plasmonic V-groove arrays etched on an aluminum surface by simply varying the groove depth while keeping the groove period as a constant. Polarization dependent structural color printing i...
متن کاملA specific color reaction of glycolic aldehyde.
Procedure-To 1 cc. of the solution to be tested 2 cc. of the reagent are added in test-tubes of uniform size. The reagent consists of 800 mg. of diphenylamine (commercial preparation recrystallized from 70 per cent alcohol) in 80 cc. of glacial acetic acid (Baker’s Special for Shellac Analysis)’ and 0.55 cc. of sulfuric acid (c.P., Nand As-free). The mixture is shaken vigorously, and then the t...
متن کاملThe Purple Color Reaction given by Diphenylamine
Niazi and State (1) recently reported that when human serum was heated with the diphenylamine reagent of Dische (2, 3) a purple color developed. They also observed that in certain disease states, e.g., carcinoma, pulmonary tuberculosis and rheumatic fever, the purple color reaction was of considerably greater intensity than in the serum of normal persons. We observed this color reaction when te...
متن کاملThe colorimetric microdetermination of urea nitrogen by the xanthydrol method.
Although many methods for the determination of urea nitrogen have been described, few have proved highly convenient for the accurate determination of small amounts of urea nitrogen without having to make use of special apparatus or techniques. Among the older methods, the Van Slyke gasometric method (1) is generally considered the most accurate, with an allowable error of 1 per cent. This metho...
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ژورنال
عنوان ژورنال: YAKUGAKU ZASSHI
سال: 1964
ISSN: 0031-6903,1347-5231
DOI: 10.1248/yakushi1947.84.1_57