title: Simultaneous determination of quinapril and its active metabolite quinaprilat in human plasma using high-performance liquid chromatography with ultraviolet detection.
abstract: A high-performance liquid chromatography (HPLC) procedure for the simultaneous determination of quinapril and its active metabolite quinaprilat in human plasma samples is described. A one-step solid-phase extraction (SPE) with C18 cartridges was coupled with a reversed-phase HPLC system. The system requires two mobile phases composed of tetrabutyl ammonium hydrogensulfate (10 mM adjusted to pH 7)-acetonitrile (62:38, v/v) for quinapril, and (25:75, v/v) for quinaprilat elution through a C18 Symmetry column and detection at a wavelength of 215 nm. Calibration curves were linear over the ranges 20 to 1,000 ng/ml for quinaprilat and 10 to 500 for quinapril. The limits of quantification were 20 and 10 ng/ml for quinaprilat and quinapril, respectively. Extraction recoveries were higher than 90% for quinapril and 80% for quinaprilat. This method has been successfully applied to a bioequivalence study of quinapril in healthy subjects.
authors.affiliation: Laboratoire de Pharmacocinetique, Centre Hospitalier et Universitaire de la Pitié-Salpétrière Assistance-Publique Hĵpitaux de Paris, France.
authors.forename: Ch
authors.initials: Ch
authors.lastname: Abbara
authors.forename: G
authors.initials: G
authors.lastname: Aymard
authors.forename: S
authors.initials: S
authors.lastname: Hinh
authors.forename: B
authors.initials: B
authors.lastname: Diquet
mesh_terms: D000806:Angiotensin-Converting Enzyme Inhibitors / Q000097:blood* / Q000493:pharmacokinetics; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D007546:Isoquinolines / Q000097:blood* / Q000493:pharmacokinetics; D000077583:Quinapril; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D044005:Tetrahydroisoquinolines; D013810:Therapeutic Equivalency
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D007546:Isoquinolines; D044005:Tetrahydroisoquinolines; C054501:quinaprilat; D000077583:Quinapril