title: Simultaneous determination of oxymatrine and its active metabolite matrine in dog plasma by liquid chromatography-mass spectrometry and its application to pharmacokinetic studies.
abstract: A simple, rapid and reliable method was developed for the quantification of oxymatrine (OMT) and its metabolite matrine (MT) in beagle dog plasma using a liquid-liquid extraction procedure followed by liquid chromatography-electrospray ionization mass spectrometric (LC-ESI-MS) analysis. Extend-C18 column (2.1 mm i.d. x 50 mm, 5 microm) with a C18 guard column (2.1 mm i.d. x 12.5 mm) was used as the analytical column. Linear detection responses were obtained for OMT concentration ranging from 5 to 4000 ng/ml and for MT concentration ranging from 5 to 2000 ng/ml. The precision and accuracy data, based on intra- and inter-day variations over 5 days, were lower than 5%. The limit of quantitation for OMT and MT were 2 and 1 ng/ml, respectively, and their recoveries were greater than 90%. Pharmacokinetic data of OMT and its active metabolite MT obtained with this method following a single oral dose of 300 mg OMT capsules to six beagle dogs was also reported for the first time.
authors.affiliation: Key Lab of Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, Nanjing 210009, China.
authors.forename: Sujun
authors.initials: S
authors.lastname: Wang
authors.forename: Guangji
authors.initials: G
authors.lastname: Wang
authors.forename: Xiaotian
authors.initials: X
authors.lastname: Li
authors.forename: Jianguo
authors.initials: J
authors.lastname: Sun
authors.forename: Renling
authors.initials: R
authors.lastname: Ma
authors.forename: Longsheng
authors.initials: L
authors.lastname: Sheng
mesh_terms: D000470:Alkaloids / Q000097:blood / Q000493:pharmacokinetics*; D000818:Animals; D000998:Antiviral Agents / Q000097:blood / Q000493:pharmacokinetics*; D002138:Calibration; D004285:Dogs; D005260:Female; D008297:Male; D011807:Quinolizines; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D000093842:Matrines
chemical_list: D000470:Alkaloids; D000998:Antiviral Agents; D011807:Quinolizines; C037573:oxymatrine; D000093842:Matrines