title: Simultaneous determination of benazepril hydrochloride and benazeprilat in plasma by high-performance liquid chromatography/electrospray-mass spectrometry.
abstract: An analytical method for simultaneous determination of benazepril and its active metabolite, benazeprilat, in human plasma by high-performance liquid chromatography/electrospray-mass spectrometry was developed and validated. Rutaecarpine was selected as the internal standard. The separation was achieved on a C(18) column with acetonitrile and aqueous solution (0.1% formic acid) as mobile phase with a gradient mode. The quantification of target compounds was using a selective ionization recording at m/z 425.5 for benazepril, m/z 397.5 for benzeprilat and m/z 288.3 for rutaecarpine. The correlation coefficients of the calibration curves were better than 0.992 (n = 6), in the range of 6.67-666.67 ng/ml for benazepril and benazeprilat. The inter- and intra-day accuracy, precision, linear range had been investigated in detail. The method can be used to assess the bioavailability and pharmacokinetics of the drug.
authors.affiliation: Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Hunan Normal University), Ministry of Education, Hunan Normal University, Changsha 410081, PR China.
authors.forename: Weitao
authors.initials: W
authors.lastname: Xiao
authors.forename: Bo
authors.initials: B
authors.lastname: Chen
authors.forename: Shouzhuo
authors.initials: S
authors.lastname: Yao
authors.forename: Zeneng
authors.initials: Z
authors.lastname: Cheng
mesh_terms: D000806:Angiotensin-Converting Enzyme Inhibitors / Q000097:blood* / Q000493:pharmacokinetics; D001552:Benzazepines / Q000097:blood* / Q000493:pharmacokinetics; D001682:Biological Availability; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D001552:Benzazepines; C052133:benazeprilat; C044946:benazepril