A new assay for 3-hydroxy-3-methylglutaryl CoA reductase (mevalonate: NADP oxidoreductase [acylating CoA] , EC 1.1.1.34) is based upon the measurement of released coenzyme A (SH) during the reduction of 3-hydroxy-3-methylglutaryl CoA to mevalonate. Coenzyme A was measured in the presence of dithiothreitol, required for activity, by reaction with 5,5’-dithiobis(2-nitrobenzoic acid). Sodium arsen...

to develop a new more accurate spectrophotometric method for detecting monoamine oxidase inhibitors from plant extracts, a series of amine substrates were selected and their ability to be oxidized by monoamine oxidase was evaluated by the hplc method and a new substrate was used to develop a peroxidase-linked spectrophotometric assay. 4-(trifluoromethyl) benzylamine (11) was proved to be an exc...

A rapid and accurate spectrophotometric assay has been developed for the determination of blood werum levels of gentamicin and related antibiotics. The assay uses a purified enzyme from Escherichia coli JR88/C600 that acetylates gentamicin with the production of coenzyme A, linked to a chemical reaction with a sulfhydryl reagent to produce stoichiometric amounts of a sensitive chromophore, moni...

Purpose: To improve the sensitivity and specificity of spectrophotometric 3-hydroxy-3-methylglutarylcoenzyme A (HMG-CoA) reductase activity assay. Methods: Spectrophotometric HMG-CoA reductase detection in male Wistar rat liver microsomes was optimized by applying different conditions, such as reaction buffer pH, NADPH and protein concentration, and preincubation and reaction times. The optimal...