title: Determination of paeoniflorin in rat plasma by a liquid chromatography-tandem mass spectrometry method coupled with solid-phase extraction.
abstract: A rapid, sensitive and selective liquid chromatography-tandem spectrometry method was developed and validated for determination of paeoniflorin in rat plasma using geniposide as the internal standard. The samples were pretreated with solid-phase extraction using Extract-Clean cartridges. Separation of paeoniflorin and IS was achieved on a reversed-phase C18 column (50x4.6 mm i.d.) with a mobile phase made up of acetonitrile and 0.05% formic acid (25:75, v/v) at a flow rate of 0.5 mL/min. Detection was carried out on a triple quadrupole tandem mass spectrometer by multiple-reaction monitoring and an electrospray ionization source was employed as the ionization source. The lower limit of quantification obtained was 4 ng/mL (n=6) using 200 microL plasma with an accuracy of -3.67% (relative error) and a precision of 4.13% (relative standard deviation). A good linearity was found in the range of 4-1000 ng/mL. The intra- and inter-day relative standard deviations in the measurement of quality control samples 10, 150 and 800 ng/mL ranged from 3.73 to 4.94% and from 4.31 to 6.56%, respectively. The accuracy was from -3.93 to -1.11% in terms of relative error. The analyte and IS were stable in the battery of stability studies. This method was successfully applied to a pharmacokinetic study of paeoniflorin after a single oral administration of 53.36 mg/kg paeoniflorin to rats.
authors.affiliation: The State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100083, People's Republic of China.
authors.forename: Qiao
authors.initials: Q
authors.lastname: Wang
authors.forename: Hanyu
authors.initials: H
authors.lastname: Yang
authors.forename: Weina
authors.initials: W
authors.lastname: Liu
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Feng
authors.forename: Lantong
authors.initials: L
authors.lastname: Zhang
authors.forename: Yanling
authors.initials: Y
authors.lastname: Li
authors.forename: Kaishun
authors.initials: K
authors.lastname: Bi
authors.forename: Dean
authors.initials: D
authors.lastname: Guo
mesh_terms: D000818:Animals; D001565:Benzoates / Q000097:blood* / Q000493:pharmacokinetics; D001952:Bridged-Ring Compounds / Q000097:blood* / Q000493:pharmacokinetics; D002853:Chromatography, Liquid / Q000379:methods*; D005960:Glucosides / Q000097:blood* / Q000493:pharmacokinetics; D008297:Male; D039821:Monoterpenes; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods; D006027:Glycosides
chemical_list: D001565:Benzoates; D001952:Bridged-Ring Compounds; D005960:Glucosides; D039821:Monoterpenes; C015423:peoniflorin; D006027:Glycosides