title: Determination of zafirlukast, a selective leukotriene antagonist, human plasma by normal-phase high-performance liquid chromatography with fluorescence detection.
abstract: A high-performance liquid chromatographic (HPLC) method was developed for the determination of zafirlukast, a selective peptide leukotriene receptor antagonist, in human plasma. Zafirlukast and the internal standard, ICI 198 707, were extracted from deproteinated plasma samples using large reservoir C18 solid-phase extraction columns and analyzed by normal-phase liquid chromatography with fluorescence detection. The method had a lower limit of quantitation of 0.75 ng/ml and a linear calibration curve in the range of 0.75 to 200 ng/ml. The absolute recovery of zafirlukast was > 90%, and the within-day and between-day relative standard deviations were < 9%. The utility of the method in the characterization of the plasma concentration-time profiles of zafirlukast in clinical studies was demonstrated.
authors.affiliation: Drug Disposition and Metabolism Department, ZENECA Pharmaceuticals, Wilmington, DE 19897, USA.
authors.forename: K H
authors.initials: KH
authors.lastname: Bui
authors.forename: C M
authors.initials: CM
authors.lastname: Kennedy
authors.forename: C T
authors.initials: CT
authors.lastname: Azumaya
authors.forename: B K
authors.initials: BK
authors.lastname: Birmingham
mesh_terms: D000284:Administration, Oral; D018927:Anti-Asthmatic Agents / Q000008:administration & dosage / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002940:Circadian Rhythm; D006801:Humans; D007211:Indoles; D020024:Leukotriene Antagonists; D016014:Linear Models; D009994:Osmolar Concentration; D048448:Phenylcarbamates; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence; D013449:Sulfonamides; D013997:Time Factors; D014105:Tosyl Compounds / Q000008:administration & dosage / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics
chemical_list: D018927:Anti-Asthmatic Agents; D007211:Indoles; D020024:Leukotriene Antagonists; D048448:Phenylcarbamates; D013449:Sulfonamides; D014105:Tosyl Compounds; C062735:zafirlukast