title: Simultaneous determination of seven flavonoids in dog plasma by ultra-performance liquid chromatography-tandem mass spectrometry and its application to a bioequivalence study of bioactive components in Herba Epimedii and Er-Xian Decoction.
abstract: In this study, a sensitive and specific ultra-performance liquid chromatography-tandem mass method has been developed and validated for the identification and determination of 7 flavonoids in dog plasma for the first time: epimedin A, epimedin B, epimedin C, icariin, sagittatoside B, 2″-O-rhamnosyl icariside II, and baohuoside I. Chromatographic separation was accomplished on an Agilent Zorbax-SB C(18) column (50 mm × 2.1mm, 1.8 μm) with a gradient elution system composed of 0.3% acetic acid and 0.3% acetic acid in acetonitrile at a flow rate of 0.4 mL/min. Detection was based on a triple quadrupole mass spectrometer using a multiple reaction monitoring mode with an electrospray ionization source. All of the calibration curves showed good linearity (r>0.99) within the tested concentration ranges. The lower limits of quantification of the seven analytes were all lower than 0.0654 ng/mL. The relative standard deviations for intra- and inter-batches of the seven analytes were less than 13.7% and 14.9%, respectively, at four concentration levels of quality control samples, and the recoveries were between 92.8% and 114.5%, respectively. In addition, the seven flavonoids were found to be stable in dog plasma samples under short- and long-term storage and processing conditions. The validated method was successfully applied to a bioequivalence study in dog plasma after the oral administration of extracts of Herba Epimedii and Er-Xian Decoction.
authors: Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China.
authors: Caisheng
authors: C
authors: Wu
authors: Jinlan
authors: J
authors: Zhang
authors: Tonghui
authors: T
authors: Zhou
authors: Baolin
authors: B
authors: Guo
authors: Yilin
authors: Y
authors: Wang
authors: Jinfeng
authors: J
authors: Hou
mesh_terms: D000818:Animals; D002626:Chemistry, Pharmaceutical / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002853:Chromatography, Liquid / Q000379:methods*; D004285:Dogs; D004365:Drugs, Chinese Herbal / Q000032:analysis / Q000737:chemistry*; D034181:Epimedium / Q000737:chemistry; D005419:Flavonoids / Q000097:blood / Q000737:chemistry*; D008297:Male; D013058:Mass Spectrometry / Q000379:methods*; D011786:Quality Control; D015203:Reproducibility of Results; D013997:Time Factors
chemical_list: D004365:Drugs, Chinese Herbal; D005419:Flavonoids; C046314:epimedii flavone; C517980:er-xian decoction