title: Development of a method for the determination of ibafloxacin in plasma by HPLC with flourescence detection and its application to a pharmacokinetic study.
abstract: A simple, rapid, and sensitive high-performance liquid chromatographic method is developed for the determination of ibafloxacin in rabbit plasma. Plasma proteins are precipitated with acetonitrile, and after extraction with methylene chloride followed by desecation, ibafloxacin is determined by reversed-phase chromatography with fluorescence detection exciting at 330 nm and emission at 368 nm. Peaks corresponding to ibafloxacin and the internal standard (salycilic acid) are obtained at 9.8 and 5.2 min, respectively. The method is validated for a limit of quantitation of 10 ng/mL. The intraday relative standard deviation ranges from 4.78-7.15%, and the interday precision ranges from 1.32-4.03%. The method shows linearity for the two calibration curves used (10-100 ng/mL and 100-2000 ng/mL). The procedure described is applied successfully to a pharmacokinetics study of ibafloxacin in rabbits.
authors.affiliation: Department of Pharmacology, Faculty of Veterinary Medicine, University of Murcia, Campus de Espinardo, 30.071-Murcia, Spain.
authors.forename: Pedro
authors.initials: P
authors.lastname: Marín
authors.forename: Carlos M
authors.initials: CM
authors.lastname: Cárceles
authors.forename: Elisa
authors.initials: E
authors.lastname: Escudero
authors.forename: Ruperto
authors.initials: R
authors.lastname: Bermejo
authors.forename: Emilio
authors.initials: E
authors.lastname: Fernández-Varón
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D008297:Male; D011807:Quinolizines / Q000097:blood* / Q000493:pharmacokinetics; D011817:Rabbits; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D000900:Anti-Bacterial Agents; D011807:Quinolizines; C049886:ibafloxacin