title: Determination of 25-OH-PPD in rat plasma by high-performance liquid chromatography-mass spectrometry and its application in rat pharmacokinetic studies.
abstract: A sensitive and specific liquid chromatography/tandem mass spectrometry (LC/MS/MS) method was developed for the investigation of the pharmacokinetics of 20(R)-dammarane-3beta,12beta,20,25-tetrol (25-OH-PPD) in rat. Ginsenoside Rh(2) was employed as an internal standard. The plasma samples were pretreated by liquid-liquid extraction and analyzed using LC/MS/MS with an electrospray ionization interface. The mobile phase consisted of methanol-acetonitrile-10 mmol/l aqueous ammonium acetate (42.5:42.5:15, v:v:v), which was pumped at 0.4 ml/min. The analytical column (50 mm x 2.1 mm i.d.) was packed with Venusil XBP C8 material (3.5 microm). The standard curve was linear from 10 to 3000 ng/ml. The assay was specific, accurate (accuracy between -1.19 and 2.57% for all quality control samples), precise and reproducible (within- and between-day precisions measured as relative standard deviation were <5% and <7%, respectively). 25-OH-PPD in rat plasma was stable over three freeze-thaw cycles and at ambient temperatures for 6h. The method had a lower limit of quantitation of 10 ng/ml, which offered a satisfactory sensitivity for the determination of (25-OH-PPD) in plasma. This quantitation method was successfully applied to pharmacokinetic studies of 25-OH-PPD after both an oral and an intravenous administration to rats and the absolute bioavailability is 64.8+/-14.3%.
authors.affiliation: Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang 110016, China.
authors.forename: Xiangrong
authors.initials: X
authors.lastname: Zhang
authors.forename: Dan
authors.initials: D
authors.lastname: Zhang
authors.forename: Jinghua
authors.initials: J
authors.lastname: Xu
authors.forename: Jingkai
authors.initials: J
authors.lastname: Gu
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D036145:Ginsenosides / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics*; D015394:Molecular Structure; D051381:Rats; D017208:Rats, Wistar; D015203:Reproducibility of Results; D053719:Tandem Mass Spectrometry / Q000379:methods*