title: Determination and pharmacokinetics of manidipine in human plasma by HPLC/ESIMS.
abstract: A sensitive HPLC/ESIMS method was established for the determination of manidipine in human plasma and pharmacokinetics study. After basified plasma with ammonia, manidipine and the internal standard (IS) (felodipine) were extracted with n-hexane and separated on a Hypersil ODS2 column with a mobile phase of methanol-5 mm ammonium acetate solution containing 0.1% acetic acid (85:15, v/v). MS determination was performed by electrospray ionization in the selected ion monitoring mode. Manidipine was monitored at m/z 611.4 and IS at m/z 384. The assay had a calibration range from 0.2 to 20 ng/mL and a lower limit of quantification of 0.1 ng/mL. The method has been successfully applied to the pharmacokinetic study in healthy volunteers.
authors.affiliation: Center of Drug Metabolism and Pharmacokinetics, China Pharmaceutical University 24 Tongjiaxiang, Nanjing 210009, Jiangsu, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Jing
authors.forename: Weichao
authors.initials: W
authors.lastname: Ren
authors.forename: Xijing
authors.initials: X
authors.lastname: Chen
authors.forename: Hui
authors.initials: H
authors.lastname: He
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Xuping
authors.initials: X
authors.lastname: Zhu
authors.forename: Ya
authors.initials: Y
authors.lastname: Sun
authors.forename: Guangji
authors.initials: G
authors.lastname: Wang
mesh_terms: D000959:Antihypertensive Agents / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004095:Dihydropyridines / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D006801:Humans; D009578:Nitrobenzenes; D010879:Piperazines; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000959:Antihypertensive Agents; D004095:Dihydropyridines; D009578:Nitrobenzenes; D010879:Piperazines; C054218:manidipine