Results 251 to 260 of about 282,094 (307)

Colorimetric Assay of Epinephrine

Journal of Pharmaceutical Sciences, 1974
A new colorimetric assay method for epinephrine, based on the reaction with thiosemicarbazide in alkaline medium, is presented. Beer's law is followed in the range of 25–300 μg. Data on precision, accuracy, and specificity are included. A special calculation is adopted in the presence of norepinephrine.
R B, Salama, S K, Khalil
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Colorimetric Assay of Disulfiram

Journal of Pharmaceutical Sciences, 1973
A quantitative assay for disulfiram was developed based on color formation during the interaction of disulfiram, ethanol, and cyanide. A linear curve is obtained over a wide range of disulfiram concentrations. Metabolites of disulfiram do not interfere in this assay.
R, Fried, A N, Masoud, F M, Klein
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Colorimetric assay for cellular transglutaminase

Analytical Biochemistry, 1989
A colorimetric assay for cellular transglutaminase using 5-(biotinamido)pentylamine and polyvinylidine difluoride membranes for crude cellular preparations and purified enzyme has been developed. The biotinpentylamine substrate was incorporated into N,N-dimethylcasein by transglutaminase, the biotinylated products were adsorbed onto the membrane disks ...
W M, Jeon, K N, Lee, P J, Birckbichler, E, Conway, M K, Patterson   +4 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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Colorimetric assay of catalase

Analytical Biochemistry, 1972
A simple colorimetric assay for catalase activity has been described using K2Cr2O7/acetic acid reagent. Kat. f values of different enzyme sources were determined by the colorimetric method and compared with the values obtained by titrimetric methods.
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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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Detection of opines by colorimetric assay

Analytical Biochemistry, 1987
A colorimetric procedure for confirming the presence of arginine-derived opines (nopaline and octopine) in plant tissue extracts is described. Those materials are widely used as markers of plant cell transformation and tumorigenesis mediated by the tumor-inducing plasmids of Agrobacterium tumefaciens.
N S, Yang, S G, Platt, P, Christou
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An improved colorimetric assay for polyols

Analytical Biochemistry, 1977
Abstract A new assay for polyols was developed that minimizes interference by sugars. It is based on oxidation of alditols to formaldehyde by acidic periodate, reduction of the excess periodate with l -rhamnose, and a short-time determination of the formaldehyde with the Nash reagent. When glycerol was added to various crude biological materials and
S H, Bok, A L, Demain
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An easy colorimetric assay for glycosyltransferases

Biochemistry (Moscow), 2010
Glycosyltransferases are involved in biosynthesis of both protein-bound and non-bound glycans that have multiple and important biological functions in all species. A variety of methods for assaying glycosyltransferase activity have been developed driven by the specific interests and type of information required by researchers.
Rui, Shen, Shuai, Wang, Xiaofeng, Ma, Junyang, Xian, Jing, Li, Lianwen, Zhang, Peng, Wang   +6 more
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