title: Determination of schizandrin in rat plasma by high-performance liquid chromatography-mass spectrometry and its application in rat pharmacokinetic studies.
abstract: A sensitive liquid chromatography-mass spectrometric (LC/MS) method for the quantification of schizandrin in rat plasma was developed and validated after solid-phase extraction (SPE). Chromatographic separation was achieved on a reversed-phase Shimadzu C(18) column with the mobile phase of acetonitrile-sodium acetate (10 micromol/L) and step gradient elution resulted in a total run time of about 11.7 min. The analytes were detected using an electrospray positive ionization mass spectrometry in the selected ion monitoring (SIM) mode. A good linear relationship was obtained in the concentration range studied (0.005-2.000 microg/mL) (r=0.9999). Lower limit of quantification (LLOQ) was 5 ng/mL and the lower limit of detection (LLOD) was 2 ng/mL using 100 microL plasma sample. Average recoveries ranged from 75.85 to 88.51% in plasma at the concentrations of 0.005, 0.100 and 1.000 microg/mL. Intra- and inter-day relative standard deviations were 5.95-12.93% and 3.87-14.53%, respectively. This method was successfully applied for the pharmacokinetic studies in rats.
authors.affiliation: Key Lab of Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, Nanjing 210009, China.
authors.forename: Meijuan
authors.initials: M
authors.lastname: Xu
authors.forename: Guangji
authors.initials: G
authors.lastname: Wang
authors.forename: Haitang
authors.initials: H
authors.lastname: Xie
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Li
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Danni
authors.initials: D
authors.lastname: Zhu
authors.forename: Lei
authors.initials: L
authors.lastname: Yue
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D034242:Cyclooctanes / Q000097:blood* / Q000493:pharmacokinetics*; D004355:Drug Stability; D017705:Lignans / Q000097:blood* / Q000493:pharmacokinetics*; D013058:Mass Spectrometry / Q000379:methods*; D011083:Polycyclic Compounds / Q000097:blood* / Q000493:pharmacokinetics*; D051381:Rats; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D034242:Cyclooctanes; D017705:Lignans; D011083:Polycyclic Compounds; C011105:schizandrin