title: Simultaneous rapid quantification of ginsenoside Rg1 and its secondary glycoside Rh1 and aglycone protopanaxatriol in rat plasma by liquid chromatography-mass spectrometry after solid-phase extraction.
abstract: Ginseng saponins isolated from ginseng, have been regarded as the principal constituents responsible for the biological activities. The aim of this study was to set up a liquid chromatography-mass spectrometry (LC-MS) method for simultaneously determine the concentration of Ginsenoside Rg1 and its secondary glycoside Rh1 and aglycone protopanaxatriol (PPT) in rat plasma so as to study the pharmacokinetics of Rg(1) after intraveneous (i.v.) and intragastric gavage (i.g.) administration. One hundred microliters or 1.0 ml of rat plasma samples from i.v. or i.g. treated rats were used respectively for analysis. After solid-phase extraction (SPE) and high performance liquid chromatography (HPLC) separation, the chloride adduct anions [M+Cl]- of Rg1, Rh1 and PPT were analyzed by LC-MS in selected ions monitoring (SIM) mode. Rg(1) could be determined by this LC-MS method over the ranges of 1.56-250 ng/ml and 250-20,000 ng/ml with the correlation coefficients of 0.999 and 0.9998, respectively. The detection limits (LOD) of this method was 20 pg (S/N>3) for Rg1, 100 pg for Rh1 and 10 pg for PPT. Chromatographic separation was achieved in less than 8 mins. The method has been used for the pharmacokinetic study of Rg1 in rats.
authors.affiliation: Key Laboratory of Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, Nanjing 210009, China.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Sun
authors.forename: Guangji
authors.initials: G
authors.lastname: Wang
authors.forename: Xie
authors.initials: X
authors.lastname: Haitang
authors.forename: Li
authors.initials: L
authors.lastname: Hao
authors.forename: Pan
authors.initials: P
authors.lastname: Guoyu
authors.forename: Ian
authors.initials: I
authors.lastname: Tucker
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005615:Freezing; D036145:Ginsenosides / Q000097:blood*; D013058:Mass Spectrometry / Q000379:methods*; D051381:Rats; D012015:Reference Standards; D012680:Sensitivity and Specificity
chemical_list: D036145:Ginsenosides; C425564:ginsenoside Rh1; C035054:ginsenoside Rg1