Colorimetric Determination of Organic Substances.
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چکیده
منابع مشابه
Application of the sodium diethyldithiocarbamate reaction to the micro-colorimetric determination of copper in organic substances.
WHEN an aqueous solution of sodium diethyldithiocarbamate is added to a solution containing copper the normal copper salt of diethyldithiocarbamic acid, which has a golden-brown colour, is formed. Callan and Henderson [1929], who discovered this reaction, applied their method with satisfactory results to the determination of copper in inorganic substances, but were not concerned with biological...
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Simple sugars, oligosaccharides, polysaccharides, and their derivatives, including the methyl ethers with free or potentially free reducing groups, give an orangeyellow color w-hen treated with phenol and concentrated sulfuric acid. The reaction is sensitive and the color is stable. By use of this phenol-sulfuric acid reaction, a method has been developed to determine submicro amounts of sugars...
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In the past few years there has been renewed interest in the study of serum cholinesterase in various disease states, particularly those affecting the liver. Recently, a colorimetric method for the determination of this enzyme in the serum was reported by Ravin, Tsou, and Seligman (1). Their method, simple to perform, is as accurate as the gastrometric technique and more specific than the elect...
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Extraction-As the oxidation is essentially non-specific, the plasma extract must be as free of non-lipide reducing substances as possible. All solvents should be tested occasionally for reducing residues remaining after evaporation, and redistilled if necessary. Ether should be maintained peroxide-free. The determinations reported here followed a conventional alcohol-ether extraction and subseq...
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ژورنال
عنوان ژورنال: Journal of Industrial & Engineering Chemistry
سال: 1919
ISSN: 0095-9014,1943-2968
DOI: 10.1021/ie50112a013