title: Liquid chromatographic/mass spectrometry assay of triptolide in dog plasma and its application to pharmacokinetic study.
abstract: A rapid and sensitive method for the determination of triptolide in dog plasma was developed and validated, using high-performance liquid chromatography/atmospheric pressure chemical ionization mass spectrometry (LC/APCI/MS). Sample preparation consisted of liquid-liquid extraction with ethyl acetate from dog plasma. The analytes and internal standard prednisolone were well separated on a Zorbax Extend-C18 analytical column. Detection was performed on a triple quadrupole mass spectrometer using selected-ion monitoring (SIM) mode on the deprotonated ions [M-H]- at m/z 359. Calibration curves were linear over the concentration range of 0.5-200 ng/mL of triptolide with the intra- and inter-day precision (the relative standard deviation values) were being less than 7%. Triptolide was stable under different conditions. The intra-day and inter-day accuracy were 99.3-105.2% and 101.3-107.0%, respectively. The lower limit of quantification was 0.5 ng/mL. The method was successfully applied to a pharmacokinetic study after an intragastric administration (i.g.) of triptolide to dogs with a dose of 0.05 mg/kg. The results confirm that the assay is suitable for the pharmacokinetic study of triptolide.
authors.affiliation: Key Laboratory of Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, Nanjing 210009, Jiangsu Province, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Shao
authors.forename: Guangji
authors.initials: G
authors.lastname: Wang
authors.forename: Jianguo
authors.initials: J
authors.lastname: Sun
authors.forename: Haitang
authors.initials: H
authors.lastname: Xie
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Yan
authors.initials: Y
authors.lastname: Liang
authors.forename: Rong
authors.initials: R
authors.lastname: Zhang
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Zhu
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004224:Diterpenes / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D004285:Dogs; D004852:Epoxy Compounds / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics; D007166:Immunosuppressive Agents / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D007441:Intubation, Gastrointestinal; D013058:Mass Spectrometry; D010616:Phenanthrenes / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D015203:Reproducibility of Results
chemical_list: D004224:Diterpenes; D004852:Epoxy Compounds; D007166:Immunosuppressive Agents; D010616:Phenanthrenes; C001899:triptolide