title: Determination of norfloxacin, a new nalidixic acid analog, in human serum and urine by high-performance liquid chromatography.
abstract: A high-performance liquid chromatographic method for the analysis of norfloxacin (MK-366) [1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)3-quinolinecarboxylic acid], a new nalidixic acid analog, in human serum and urine is described. A statistical evaluation of the assay data showed acceptable accuracy and precision for 0.1 to 10.0 micrograms of MK-366 per ml of serum and for 1.0 to 500 micrograms of MK-366 per ml of urine. MK-366 was extracted from serum and urine at pH 7.5 with methylene chloride and back-extracted with sodium hydroxide solution. Chromatography was performed on an anion-exchange column with acetonitrile-phosphate buffer as the mobile phase; UV absorbance was monitored at 273 nm. The method was used to measure MK-366 in clinical specimens.
mesh_terms: D000890:Anti-Infective Agents / Q000032:analysis* / Q000097:blood / Q000652:urine; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006801:Humans; D008297:Male; D009268:Nalidixic Acid / Q000031:analogs & derivatives* / Q000032:analysis / Q000097:blood / Q000652:urine; D009643:Norfloxacin
chemical_list: D000890:Anti-Infective Agents; D009268:Nalidixic Acid; D009643:Norfloxacin