title: Rapid and economical high-performance liquid chromatographic method for the determination of norfloxacin in serum using a microparticulate C18 guard cartridge.
abstract: A rapid and economical high-performance liquid chromatographic assay is described for norfloxacin in serum. Samples (100 microliters) containing N-ethylnorfloxacin as the internal standard were extracted into 1 ml of chloroform. Chromatography was performed at 30 degrees C on a 40 x 3.2 mm I.D. C18 guard cartridge (3 microns spherical particles) using a mobile phase of 11% (v/v) acetonitrile in 0.01 M phosphate buffer (pH 2.5) containing 0.001 M triethylamine, and pumped at 1 ml/min. Detection was at 279 nm. The retention times of norfloxacin and internal standard were 1.9 and 2.9 min, respectively. Calibration curves were linear (r > 0.999) from 0.1 mg/l to at least 2.0 mg/l. Within-day and between-day precision (C.V.) were 8.6% or less, and accuracy was 5.3% or less. Absolute assay recovery of norfloxacin was over 70%.
authors.affiliation: Department of Chemistry, University of Queensland, Brisbane, Australia.
authors.forename: S C
authors.initials: SC
authors.lastname: Wallis
authors.forename: B G
authors.initials: BG
authors.lastname: Charles
authors.forename: L R
authors.initials: LR
authors.lastname: Gahan
mesh_terms: D000890:Anti-Infective Agents / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000191:economics / Q000379:methods* / Q000706:statistics & numerical data; D006801:Humans; D008863:Microspheres; D009643:Norfloxacin / Q000097:blood* / Q000493:pharmacokinetics; D012680:Sensitivity and Specificity
chemical_list: D000890:Anti-Infective Agents; D009643:Norfloxacin