title: Quantification of voriconazole in plasma by liquid chromatography-tandem mass spectrometry.
abstract: A convenient liquid chromatography-tandem mass spectrometry method for the quantification of the triazole antifungal agent voriconazole in plasma samples is described. Fenbuconazole is used as an internal standard. After protein precipitation, automated solid-phase extraction is applied. Electrospray ionization in the positive mode is used and the following mass transitions are recorded: voriconazole, 350-->127; and fenbuconazol, 337-->125. The analytical run time is 4 min. The response was linear from 78 to 5000 microg/L. The total coefficient of variation (n=16) was 12.6% for a low-concentration pool (143 microg/L), 4.7% for a medium-concentration pool (419 microg/L), and 5.0% for a high-concentration pool (4304 microg/L). The method is proposed for future investigations that should be performed to test the hypothesis that therapeutic drug monitoring of voriconazole is clinically useful.
authors.affiliation: Institute of Clinical Chemistry, Hospital of the University of Munich, Munich, Germany. michael.vogeser@med.uni-muenchen.de
authors.forename: Michael
authors.initials: M
authors.lastname: Vogeser
authors.forename: Xaver
authors.initials: X
authors.lastname: Schiel
authors.forename: Ute
authors.initials: U
authors.lastname: Spöhrer
mesh_terms: D000935:Antifungal Agents / Q000097:blood*; D001774:Blood Chemical Analysis / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D002853:Chromatography, Liquid / Q000379:methods; D006801:Humans; D011743:Pyrimidines / Q000097:blood*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods; D014230:Triazoles / Q000097:blood*; D065819:Voriconazole
chemical_list: D000935:Antifungal Agents; D011743:Pyrimidines; D014230:Triazoles; D065819:Voriconazole