title: Simultaneous determination of vitexin-4''-O-glucoside and vitexin-2''-O-rhamnoside from Hawthorn leaves flavonoids in rat plasma by HPLC method and its application to pharmacokinetic studies.
abstract: The present study was to investigate the pharmacokinetics of the two similar flavonoid glycosides, vitexin-4''-O-glucoside (VGL) and vitexin-2''-O-rhamnoside (VRH) in rats after intravenous administration of hawthorn leaves flavonoids (HLF). Blood samples were collected via tail vein at time intervals after drug administration and the plasma concentrations of the studied ingredients were analyzed by HPLC after the plasma protein was precipitated directly with methanol. VGL and VRH were successfully separated using a C(18) column with a UV detection at 330 nm and a mobile phase of methanol-acetonitrile-tetrahydrofuran-0.5% acetic acid (1:1:19.4:78.6, v/v/v/v). The assay linearities of VGL and VRH were confirmed over the range 0.23-138.42 and 0.36-218.49 microg/ml, respectively. The accuracy and precision of the two analytes at high, medium and low concentration were within the range of -3.13% to 3.51% and below 4%, the mean assay recoveries of them (n=5) ranged from 96.87% to 101.75% and 96.88% to 103.51% for intra- and inter-day assays and the mean extraction recoveries of them (n=5) varied from 92.68% to 95.74% for VGL and 93.45% to 99.26% for VRH, respectively. After intravenous administration of HLF to rats over the doses range of 10-40 mg/kg, the plasma concentration--time curves of VGL and VRH were both conformed to the three-compartment open pharmacokinetic model and linear pharmacokinetic characteristics.
authors.affiliation: Department of Clinical Pharmacy, West China School of Pharmacy, Sichuan University, Key Laboratory of Drug Targeting of Ministry of Education, Chengdu 610041, PR China.
authors.forename: Guo
authors.initials: G
authors.lastname: Ma
authors.forename: Xue-Hua
authors.initials: XH
authors.lastname: Jiang
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Chen
authors.forename: Jing
authors.initials: J
authors.lastname: Ren
authors.forename: Chen-Rui
authors.initials: CR
authors.lastname: Li
authors.forename: Tai-Ming
authors.initials: TM
authors.lastname: Liu
mesh_terms: D000818:Animals; D047310:Apigenin / Q000008:administration & dosage / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D027825:Crataegus / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D004355:Drug Stability; D005260:Female; D005419:Flavonoids / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D005615:Freezing; D006207:Half-Life; D007275:Injections, Intravenous; D016018:Least-Squares Analysis; D008297:Male; D008657:Metabolic Clearance Rate; D000432:Methanol / Q000737:chemistry; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry*; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D013997:Time Factors
chemical_list: D005419:Flavonoids; D010936:Plant Extracts; C021329:vitexin rhamnoside; D047310:Apigenin; C032731:vitexin; D000432:Methanol