title: LC-MS/MS method for the simultaneous determination of icariin and its major metabolites in rat plasma.
abstract: A rapid and sensitive method using liquid chromatography-tandem mass spectroscopy (LC-MS/MS) was developed and validated for the simultaneous quantitative determination of icariin and its two major metabolites, icariside I and icariside II in rat plasma. The analytes were extracted by liquid-liquid extraction with ethyl acetate after internal standard (daidzein) spiked. The separation was performed by a ZORBAX SB-C(18) column (3.5 microm, 2.1 mm x 100 mm) and a C(18) guard column (5 microm, 4.0 mm x 2.0mm) with an isocratic mobile phase consisting of acetonitrile-water-formic acid (50:50:0.05, v/v/v) at a flow rate of 0.25 mL/min. The Agilent G6410A triple quadrupole LC-MS system was operated under the multiple reaction monitoring (MRM) mode using the electrospray ionization technique in positive mode. The nominal retention times for icariin, icariside I, icariside II and daidzein were 1.21, 1.88, 2.34 and 1.35 min, respectively. The lower limits of quantification (LLOQ) of icariin, icariside I and icariside II of the method were 1.0, 0.5 and 0.5 ng/mL, respectively. The method was linear for icariin and its metabolites with correlation coefficients >0.995 for all analytes. The intra-day and inter-day accuracy and precision of the assay were less than 12.5%. This method has been applied successfully to a pharmacokinetic study involving the intragastric administration of icariin to rats.
authors: Department of Natural Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, PR China.
authors: Wen
authors: W
authors: Xu
authors: Yaping
authors: Y
authors: Zhang
authors: Ming
authors: M
authors: Yang
authors: Ziyin
authors: Z
authors: Shen
authors: Xinmin
authors: X
authors: Zhang
authors: Weidong
authors: W
authors: Zhang
authors: Haiyun
authors: H
authors: Li
mesh_terms: D000284:Administration, Oral; D000818:Animals; D002853:Chromatography, Liquid / Q000379:methods; D034181:Epimedium / Q000737:chemistry; D047309:Flavones / Q000097:blood* / Q000302:isolation & purification; D005419:Flavonoids / Q000008:administration & dosage / Q000097:blood* / Q000302:isolation & purification / Q000378:metabolism*; D007529:Isoflavones / Q000097:blood; D008297:Male; D008516:Medicine, Chinese Traditional; D051381:Rats; D017208:Rats, Wistar; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D053719:Tandem Mass Spectrometry / Q000379:methods; D014468:Umbelliferones / Q000097:blood* / Q000302:isolation & purification
chemical_list: D047309:Flavones; D005419:Flavonoids; D007529:Isoflavones; D014468:Umbelliferones; C526898:icariside I; C060988:baohuoside I; C004742:daidzein; C056599:icariin