title: Quantitative determination of nitrendipine in human plasma using high-performance liquid chromatography-mass spectrometry.
abstract: A sensitive and highly selective liquid chromatography-mass spectrometry (LCMS) method was developed to determine nitrendipine (4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)-3, 5-pyridinedicarboxylic acid ethyl methyl ester, CAS 39562-70-4) in human plasma. The analyte and the internal standard nimodipine (CAS 66085-59-4) were extracted from plasma samples by n-hexane-isopropanol (95:5, v/v), and analyzed on a commercially available column Interfaced with a mass spectrometer. Positive atmospheric pressure chemical ionization (APCI) was empolyed as the ionization source. The samples were detected by the use of selected ion monitoring (SIM) mode. The mobile phase consisted of methanol-water (75:25, v/v). The method has a limit of detection (LOD) of 0.1 ng/ml. The linear calibration curves were obtained in the concentra tions range of 0.3-40 ng/ml (r2 > or = .99). The intra- and inter-day batch precisions were lower than 10% in terms of relative standard deviation (R. S. D.), and the accuracy ranged from 85 to 110% in terms of percent accuracy. The overall extraction recoveries were determined to be about 75% on average. This validated method was successfully applied to the evaluation of the pharmacokinetic profiles of nitrendipine tablets administered to 8 Chinese healthy volunteers.
authors.affiliation: Key Laboratory of Drug Quality Control and Pharmacovigilance (China Pharmaceutical University), Ministry of Education, Nanjing, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Feng-Guo
authors.initials: FG
authors.lastname: Xul
authors.forename: Zun-Jian
authors.initials: ZJ
authors.lastname: Zhang
authors.forename: Rui
authors.initials: R
authors.lastname: Song
authors.forename: Yuan
authors.initials: Y
authors.lastname: Tian
authors.forename: Yun
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000328:Adult; D019540:Area Under Curve; D002121:Calcium Channel Blockers / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid; D006207:Half-Life; D006801:Humans; D013058:Mass Spectrometry; D009568:Nitrendipine / Q000097:blood* / Q000493:pharmacokinetics; D012015:Reference Standards; D015203:Reproducibility of Results
chemical_list: D002121:Calcium Channel Blockers; D009568:Nitrendipine