Results 251 to 260 of about 190,909 (304)

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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A quantitative colorimetric assay for semialdehydes

Analytical Biochemistry, 1990
We have studied the ability of the enzyme pyrroline-5-carboxylate dehydrogenase to oxidize aldehydes which are structurally similar to pyrroline-5-carboxylate, the enamine of gamma-glutamyl semialdehyde. These studies required the organic synthesis of semialdehydes not commercially available.
W C, Small, M E, Jones
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A colorimetric formaldehyde assay

Applied Biochemistry and Biotechnology, 1997
A room-temperature assay of formaldehyde is described. The assay uses few reagents and is colorimetric, read at a wavelength of 649 nm. Tryptophan and tryptamine were noted as interfering with the assay, probably by binding with the formaldehyde. High levels of sugar show smaller effects on final absorbance. Glyceraldehyde also reacts in the assay, but
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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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