title: Determination of azelnidipine in human plasma by liquid chromatography-electrospray ionization-mass spectrometry.
abstract: A liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) method for the determination of azelnidipine in human plasma was established. Nicardipine was used as the internal standard (IS). After adjustment to a basic pH with sodium hydroxide solution (0.1 M), plasma samples were extracted with cyclohexane-diethyl ether (1:1, v/v) and separated on a C(18) column with a mobile phase of 20 mM ammonium acetate solution-methanol-formic acid (25:75:0.5, v/v). The electrospray ionization was employed in a single quadrupole mass spectrometer for the determination. The method was linear over the concentration range of 0.05-40 ng/ml. The lower limit of quantification (LLOQ) was 0.05 ng/ml. The intra- and inter-run standard deviations were less than 9.5% and 11.0%, respectively. The method was successfully applied to study the pharmacokinetics of azelnidipine in healthy Chinese volunteers.
authors.affiliation: Department of Pharmaceutical Analysis, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China.
authors.forename: Li
authors.initials: L
authors.lastname: Ding
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Ma
mesh_terms: D000284:Administration, Oral; D000328:Adult; D044466:Asian People; D001383:Azetidinecarboxylic Acid / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics; D002121:Calcium Channel Blockers / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D002681:China; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004095:Dihydropyridines / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D016903:Drug Monitoring / Q000379:methods; D006801:Humans; D016014:Linear Models; D008954:Models, Biological; D015394:Molecular Structure; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D002121:Calcium Channel Blockers; D004095:Dihydropyridines; D001383:Azetidinecarboxylic Acid; C061679:azelnidipine