title: An enzymatic assay for chloramphenicol with partially purified chloramphenicol acetyltransferase.
abstract: In an enzymatic assay for chloramphenicol, chloramphenicol acetyltransferase partially purified by affinity chromatography was used; [3H]acetyl coenzyme A served as a substrate. The purified enzyme was sensitive to p-hydroxymercuribenzoate but insensitive to 5,5'-dithio-bis-2-nitrobenzoic acid. The Michaelis-Menten constant was 10.5 muM. The operating range of the enzymatic assay was 0-30 mug/ml. The coefficient of variation was 1.9% at a concentration of 10 mug/ml. The method correlated well with a microbiological agar-paper disk method for mock unknown sera (r = 0.997) and serum or urine specimens (r = 0.993). The enzymatic assay was unaffected by the presence of any of 12 other antibiotics in tested serum.
mesh_terms: D000123:Acetyltransferases / Q000037:antagonists & inhibitors / Q000302:isolation & purification; D001681:Biological Assay / Q000379:methods*; D002701:Chloramphenicol / Q000032:analysis*; D006801:Humans; D006902:Hydroxymercuribenzoates / Q000494:pharmacology; D007700:Kinetics; D008722:Methods; D012505:Sarcina / Q000378:metabolism
chemical_list: D006902:Hydroxymercuribenzoates; D002701:Chloramphenicol; D000123:Acetyltransferases