title: Determination of ginsenoside Rd in dog plasma by liquid chromatography-mass spectrometry after solid-phase extraction and its application in dog pharmacokinetics studies.
abstract: A sensitive liquid chromatography-mass spectrometric (LC/MS) method for the quantification of ginsenoside Rd in dog plasma was developed and validated after solid-phase extraction (SPE). Chromatographic separation was achieved on a reversed-phase Cromosil C(18) column with the mobile phase of acetonitrile-ammonium chloride (500 micromol/L) and step gradient elution resulted in a total run time of about 5.5 min. The analytes were detected by using an electrospray negative ionization mass spectrometry in the selected ion monitoring (SIM) mode. A good linear relationship was obtained in the concentration range studied (0.005-2.500 microg/mL) (r=0.9998). Lower limit of quantification (LLOQ) was 5 ng/mL by using 500 microL plasma sample. Average recoveries ranged from 70.71 to 75.89% in plasma at the concentrations of 0.010, 0.100 and 2.500 microg/mL. Intra- and inter-day relative standard deviations were 8.49-11.71 and 5.71-16.48%, respectively. This method was successfully applied to the pharmacokinetic studies on dogs. The absolute bioavailability of Rd in dogs was 0.26%.
authors.affiliation: Key Laboratory of Pharmacokinetics, Nanjing, Jiangsu, China Pharmaceutical University, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Guang-Ji
authors.initials: GJ
authors.lastname: Wang
authors.forename: Hai-Tang
authors.initials: HT
authors.lastname: Xie
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Sun
authors.forename: Shuai
authors.initials: S
authors.lastname: Zhao
authors.forename: Xi-ling
authors.initials: XL
authors.lastname: Jiang
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Hua
authors.initials: H
authors.lastname: Lv
authors.forename: Mei-Juan
authors.initials: MJ
authors.lastname: Xu
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
mesh_terms: D000818:Animals; D001682:Biological Availability; D002853:Chromatography, Liquid / Q000379:methods*; D004285:Dogs; D036145:Ginsenosides / Q000097:blood* / Q000493:pharmacokinetics; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D036145:Ginsenosides; C049863:ginsenoside Rd