Results 261 to 270 of about 178,057 (307)

A colorimetric assay for immobilized chloroperoxidase

Canadian Journal of Microbiology, 1990
A rapid and sensitive colorimetric assay was developed for the estimation of chloroperoxidase activity. N,N,N′,N′-Tetramethyl-p-phenylenediamine was chosen from four potential chromogenic substrates because the blue product resulting from chloroperoxidase conversion gave the highest molar absorption.
T A, Kadima, M A, Pickard
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An ultrasensitive colorimetric assay for manganese

Analytical Biochemistry, 1988
An ultrasensitive colorimetric assay for manganese is described. It is based upon the catalysis, by Mn(II), of the photochemical oxidation of o-dianisidine, sensitized by riboflavin. Catalase increases the Mn(II)-catalyzed rate of photosensitized oxidation of dianisidine to the bisazobiphenyl, while superoxide dismutase inhibits the rate. The mechanism
W F, Beyer, I, Fridovich
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Colorimetric Assay for Acetaminophen in Serum

Therapeutic Drug Monitoring, 1984
A colorimetric method for determination of acetaminophen in serum, based on its reaction with 2-nitroso-1-naphthol-4-sulfonic acid, is described. The method is sensitive, rapid, and free from the interferences of serum matrix and most common drugs. The method can be performed manually or can be semiautomated. The results from this method correlate well
Z K, Shihabi, R M, David
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A quantitative colorimetric assay for squalene

Analytical Biochemistry, 1962
Abstract A rapid and sensitive quantitative colorimetric test for squalene has been devised. The color reaction involves the use of sulfuric acid and formaldehyde. The test will give a positive reaction with other compounds which contain double bonds and must consequently be used in conjunction with other methods which yield purified squalene.
G H, ROTHBLAT, D S, MARTAK, D, KRITCHEVSKY   +2 more
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Automated colorimetric assay of Norgestrel

Steroids, 1970
Abstract A relatively sensitive assay for the contraceptive steroid norgestrel, in pharmaceutical preparations, is described. The procedure involves the blue tetrazolium reaction. Optimum conditions for color development were established. The relative standard deviation for the assay, which has a sample rate of 30 hr−1, were of the order of 0.9% at a
P M, Short, C T, Rhodes
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An automated colorimetric mutarotase assay

Analytical Biochemistry, 1966
Abstract A fully automated mutarotase assay capable of measuring thirty samples per hour or monitoring the effluent from a column is presented. A procedure for partially purifying tissue extracts for the assay is described. Comparisons with a polarimetric assay are given.
J B, Hill, D S, Cowart
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Colorimetric Assay of Tetracycline Antibiotics

Journal of Pharmaceutical Sciences, 1971
A sensitive colorimetric method of analysis for seven compounds of the tetracycline series was developed, based on the formation of a colored complex between the tetracyclines and quadrivalent thorium. The effects of pH and time upon the stability of the complexes were observed.
L G, Chatten, S I, Krause
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A colorimetric assay for γ-glutamyltranspeptidase

Clinica Chimica Acta, 1971
A highly sensitive and simple colorimetric method for the assay of γ-glutamyltranspeptidase is described. As substrate, l-γ-glutamyl-p-nitroanilide has been used, which is dissolved with glycylglycine and MgCl2 in ammediol—HCl buffer. The enzyme splits the substrate in the γ-glutamyl group and p-nitroaniline, the γ-glutamyl group is bound by the ...
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Arylsulfatases: Colorimetric and fluorometric assays

1987
Publisher Summary This chapter discusses the colorimetric and fluorometric assays of arylsulfatases. The assay of arylsulfatases is simple in principle, and any of the reaction products may be determined. The general method is simple and requires only that the reaction mixture, after incubation with the enzyme, be made alkaline so that the liberated ...
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A colorimetric method for assaying citrulline

Analytical Biochemistry, 1969
Abstract A method is available for assaying 0.1 to 1.0 m M citrulline. Urea, carbamyl phosphate, and carbamyl aspartate do not interfere with the citrulline assay.
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