title: Simultaneous determination of active xanthone glycosides, timosaponins and alkaloids in rat plasma after oral administration of Zi-Shen Pill extract for the pharmacokinetic study by liquid chromatography-tandem mass spectrometry.
abstract: A sensitive and reliable liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) has been developed and validated for simultaneous determination of active components, i.e., xanthone glycosides (neomangiferin and mangiferin), timosaponins (timosaponin E1, timosaponin B-II and timosaponin B) and alkaloids (palmatine and berberine) in rat plasma after oral administration of Zi-Shen Pill extract. Plasma samples were pretreated by protein precipitation with acetonitrile containing the internal standards ginsenoside Re (for xanthone glycosides and timosaponins) and tetrahydroberberine (for alkaloids). LC separation was achieved on a Zorbax SB-C(18) column (150 mm x 2.1 mm I.D., 3.5 microm) with gradient elution using a mobile phase consisting of acetonitrile-0.1% formic acid in water at a flow rate of 0.25 mL/min. The detection was carried out by a triple-quadrupole tandem mass spectrometer in multiple reaction monitoring (MRM) mode via polarity switching between negative (for xanthone glycosides and timosaponins) and positive (for alkaloids) ionization mode. Linear calibration curves were obtained over the concentration range of 5-1000 ng/mL for mangiferin, 0.5-100 ng/mL for neomangiferin, timosaponin E1, timosaponin B-II and timosaponin B, and 0.05-10 ng/mL for palmatine and berberine. The mean recovery of all the analytes ranged from 64.7 to 93.8%. The intra- and inter-day precision (% R.S.D.) was within 11.7% and accuracy (% bias) ranged from -9.0 to 10.9%. This fully validated method was successfully applied to pharmacokinetic study of the above seven compounds in rats.
authors.affiliation: Department of Pharmacy, Changzheng Hospital, Second Military Medical University, No. 415 Fengyang Road, Shanghai 200003, PR China.
authors.forename: Fei
authors.initials: F
authors.lastname: Cai
authors.forename: Wen
authors.initials: W
authors.lastname: Xu
authors.forename: Hua
authors.initials: H
authors.lastname: Wei
authors.forename: Lianna
authors.initials: L
authors.lastname: Sun
authors.forename: Shouhong
authors.initials: S
authors.lastname: Gao
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.forename: Jin
authors.initials: J
authors.lastname: Feng
authors.forename: Feng
authors.initials: F
authors.lastname: Zhang
authors.forename: Wansheng
authors.initials: W
authors.lastname: Chen
mesh_terms: D000818:Animals; D002853:Chromatography, Liquid / Q000379:methods*; D004355:Drug Stability; D004365:Drugs, Chinese Herbal / Q000008:administration & dosage / Q000493:pharmacokinetics; D005960:Glucosides / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D016014:Linear Models; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D012503:Saponins / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D012680:Sensitivity and Specificity; D013256:Steroids / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D053719:Tandem Mass Spectrometry / Q000379:methods*; D044004:Xanthones / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics
chemical_list: D004365:Drugs, Chinese Herbal; D005960:Glucosides; D012503:Saponins; D013256:Steroids; D044004:Xanthones; C442164:neomangiferin; C013592:mangiferin