title: Liquid chromatographic method for simultaneous determination of mycophenolic acid and its phenol- and acylglucuronide metabolites in plasma.
abstract: A simple, sensitive and reproducible HPLC method is presented for the simultaneous determination of mycophenolic acid (MPA) and its metabolites phenolic MPA-glucuronide (MPAG) and acyl glucuronide (AcMPAG) in human plasma. Sample purification requires protein precipitation with 0.1 M phosphoric acid/acetonitrile in the presence of Epilan D as an internal standard (IS). Separation was performed by reversed-phase HPLC, using a Zorbax SB-C18 column, 32% acetonitrile and a 40 mM phosphoric acid buffer at pH 3.0 as mobile phase; column temperature was 50 degrees C, flow rate 1.4 ml/min, and measurement by UV detection was at 215 nm (run time 12 min). The method requires only 50 microl plasma. Detection limits were 0.1 microg/ml for MPA and AcMPAG, and 2.0 microg/ml for MPAG, respectively. Mean absolute recovery of all three analytes was >95%. This analytical method for the determination of MPA and its metabolites is a reliable and convenient procedure that meets the criteria for application in routine clinical drug monitoring and pharmacokinetic studies.
authors.affiliation: Institute of Medical and Chemical Laboratory Diagnostics, University of Graz, Auenbruggerplatz 29, A-8036 Graz, Austria. g.khoschsorur@klinikum-graz.at
authors.forename: GholamAli
authors.initials: G
authors.lastname: Khoschsorur
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Erwa
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D020719:Glucuronides / Q000097:blood*; D006801:Humans; D009173:Mycophenolic Acid / Q000097:blood*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D020719:Glucuronides; D009173:Mycophenolic Acid