The enzymatic method for the determination of serum creatinine is accepted as one of the standard method in a clinical laboratory. The enzymatic method for the determination of serum creatinine was optimized for use with Merilyzer AutoQuant-400 auto analyzer and its performance characteristics were practically compared with Jaffe’s Kinetic. Effects of some interfering substances like Serum bili...

We describe a novel method for determining serum triglycerides, in which an enzymatic hydrolysis replaces the more commonly used saponification procedure. Under the conditions of the assay, the enzymatic hydrolysis can be completed in less than 10 mm by the combined action of a microbial lipase and a protease. We have been able to demonstrate complete hydrolysis of triglycerides by thin-layer c...

Convenient drug-resistance testing of viral mutants is indispensable to effective treatment of viral infection. We developed a novel fluorometric assay for phenotypic differentiation of drug-resistant mutants of human immunodeficiency virus-I protease (HIV-PR) which uses enzymatic and peptide-specific fluorescence (FL) reactions and high-performance liquid chromatography (HPLC) of three HIV-PR ...

D-Glucuronate is a key metabolite in the process of detoxification of xenobiotics and in a recently constructed synthetic pathway to produce D-glucaric acid, a "top value-added chemical" from biomass. A simple and specific assay of D-glucuronate would be useful for studying these processes, but existing assays are either time-consuming or nonspecific. Using uronate dehydrogenase cloned from Agr...

We use bilirubin oxidase (EC 1.3.3.5) to remove interference by bilirubin in the assay of cholesterol concentration in bile by standard enzymatic methods. Samples are treated for 10 min with nonlimiting amounts of bilirubin oxidase to form biliverdin from bilirubin before the reagent for cholesterol is added. The relatively small interference by biliverdin is easily eliminated by use of sample ...

We report a simple, enzymatic method for determining angiotensin-converting enzyme (ACE; EC 3.4.15.1) in serum. The proposed method features coupling an established reaction catalyzed by gamma-glutamyltransferase (GGT; EC 2.3.2.2) to the ACE reaction, which releases glycylglycine from the artificial substrate hippuryl-glycyl-glycine. The glycyl-glycine released by the ACE reaction becomes rate-...

We describe a sensitive method for quantifying the extent of cholesterol ester cleavage during enzymatic assay of total cholesterol in serum. Lipids are extracted from the assay mixture with chloroform/methanol (1/1 by vol), concentrated, then quantified by "high-performance" thin-layer chromatography. Although with conventional enzymatic reagents for determination of serum total cholesterol th...