title: Determination of eleutheroside E and eleutheroside B in rat plasma and tissue by high-performance liquid chromatography using solid-phase extraction and photodiode array detection.
abstract: A HPLC method with photodiode array detection (PDA) was developed for the determination and a pharmacokinetic study of eleutheroside E (ELU E) and eleutheroside B (ELU B) in rat plasma and tissue following an eleutherococcus injection. The analysis was performed on a Kromasil C18 column, using water-acetonitrile as the gradient mobile phase and 0.8 mL/min flow rate. Detection wavelengths of ELU E and ELU B were 220 and 206 nm, respectively. Protein from the biological sample was deposited using acetonitrile. ELU E and ELU B were extracted from the biological samples using acetonitrile, separated by solid-phase extraction, and eluted from the cartridge using 60% methanol. The extraction recovery of ELU E and ELU B was 91.2 and 88.8%, respectively. The limit of detection was 37.6 ng/mL for ELU E and 37.0 ng/mL for ELU B (S/N = 3) in plasma. Blood drug level-time cuvers of ELU E and ELU B in Wister rats following administration of an eleutherococcus injection into femoral vein were shown to fit a three-compartment model. The half-life (t1/2) was 4.662 h for ELU E and 2.494 h for ELU B. Following administration of a single eleutherococcus injection, the concentration of ELU E and ELU B in the tissue was Cliver > Ckidney > Cspleen > Cheart and Ckidney > Cliver > Cheart. We believe the method described in the present paper is accurate and reliable and can be used for pharmacokinetic studies of ELU E and ELU B in rats. In addition, the method for sample preparation, using solid phase extraction, is precise, simple and rapid.
authors.affiliation: Department of Pharmacy, Lanzhou University, Lanzhou, Gansu, People's Republic of China. fsllzyxy@public.lz.gs.cn
authors.forename: Shi lan
authors.initials: Sl
authors.lastname: Feng
authors.forename: Fang di
authors.initials: Fd
authors.lastname: Hu
authors.forename: Jian Xiong
authors.initials: JX
authors.lastname: Zhao
authors.forename: Xi
authors.initials: X
authors.lastname: Liu
authors.forename: Y'un
authors.initials: Y
authors.lastname: Li
mesh_terms: D000818:Animals; D019540:Area Under Curve; D002138:Calibration; D002851:Chromatography, High Pressure Liquid; D005260:Female; D005960:Glucosides / Q000097:blood / Q000493:pharmacokinetics*; D006207:Half-Life; D017705:Lignans / Q000097:blood / Q000493:pharmacokinetics*; D008099:Liver / Q000378:metabolism; D008297:Male; D010666:Phenylpropionates / Q000097:blood / Q000493:pharmacokinetics*; D051381:Rats; D017208:Rats, Wistar; D015203:Reproducibility of Results; D013154:Spleen / Q000378:metabolism
chemical_list: D005960:Glucosides; D017705:Lignans; D010666:Phenylpropionates; C421885:eleutheroside E; C028305:syringin