title: HPLC method for the determination and pharmacokinetic studies of four triterpenoids in rat plasma after oral administration of Ganoderma lucidum extract.
abstract: Four major triterpenoids (ganoderic acids C(2), B, K and H) in rat plasma after oral administration of G. lucidum extract were analyzed quantitatively by high-performance liquid chromatography (HPLC). Plasma samples taken from rats were acidified with hydrochloric acid and extracted with dichloromethane-ethyl acetate (90:10). The chromatographic separation was achieved on an Agilent Zorbax SB-C(18) column (250 x 4.6 mm, 5 microm) at 35 degrees C, with a linear gradient of acetonitrile and 0.03% aqueous phosphoric acid (v/v), at a flow rate of 1.0 mL/min. The four triterpenoids and internal standard (hydrocortisone) were detected at a wavelength 252 nm. All calibration curves showed good linearity (r(2) > 0.99) within test ranges. The relative deviation of this method was less than 10% for intra- and inter-day assays, and the accuracy ranged from 89 to 108%. The extract recovery for the four triterpenoids and internal standard ranged from 95 to 67%, and the QC samples were found to be stable according to the results of the stability study. This is the first report on determination of the major triterpenoids in rat plasma after oral administration of G. lucidum extract and the results provided a firm basis for clarifying the pharmacological effect of G. lucidum and evaluating the clinical applications of this medicinal fungus.
authors.affiliation: Shanghai Research Center for TCM Modernization, Shanghai Institute of Materia Medica, Shanghai Institute for Biological Sciences, Zhangjiang, Shanghai 201203, People's Republic of China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Wang
authors.forename: Rongxia
authors.initials: R
authors.lastname: Liu
authors.forename: Jianghao
authors.initials: J
authors.lastname: Sun
authors.forename: Shuhong
authors.initials: S
authors.lastname: Guan
authors.forename: Min
authors.initials: M
authors.lastname: Yang
authors.forename: Kaishun
authors.initials: K
authors.lastname: Bi
authors.forename: Dean
authors.initials: D
authors.lastname: Guo
mesh_terms: D000818:Animals; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D008297:Male; D010936:Plant Extracts / Q000737:chemistry*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012015:Reference Standards; D020940:Reishi / Q000737:chemistry*; D013729:Terpenes / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D010936:Plant Extracts; D013729:Terpenes