title: Determination of ondansetron and its hydroxy metabolites in human serum using solid-phase extraction and liquid chromatography/positive ion electrospray tandem mass spectrometry.
abstract: Ondansetron and its hydroxylated metabolites were determined in human serum using solid-phase extraction (SPE) and liquid chromatography/positive ion electrospray tandem mass spectrometry. Pyrimethamine was used as the internal standard. The analytes were eluted from the SPE cartridge using 2 x 1 ml of methanol containing 0.5% triethylamine, evaporated under vacuum and the residue was reconstituted in the mobile phase. The liquid chromatographic separation was achieved on a silica column using a mobile phase of aqueous 20 mM ammonium acetate (pH 4.7)-acetonitrile (85 : 15, v/v) at a flow-rate of 0.4 ml min(-1). The method was linear over the range 1-500 ng ml(-1) for ondansetron and each of the metabolites in human serum. The intra-day accuracy was better than 9.1% and the precision was <10.3%; the inter-day accuracy was better than 9.5% and the precision was <12.6%. The limit of detection was 250 pg ml(-1) based on a signal-to-noise ratio of 3. The absolute recovery from serum for all analytes was >90%.
authors: Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia 30602, USA.
authors: X
authors: X
authors: Xu
authors: M G
authors: MG
authors: Bartlett
authors: J T
authors: JT
authors: Stewart
mesh_terms: D002138:Calibration; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D015394:Molecular Structure; D017294:Ondansetron / Q000097:blood* / Q000737:chemistry / Q000378:metabolism* / Q000493:pharmacokinetics; D011739:Pyrimethamine / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012702:Serotonin Antagonists / Q000097:blood* / Q000737:chemistry / Q000378:metabolism* / Q000493:pharmacokinetics; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013223:Statistics as Topic
chemical_list: D012702:Serotonin Antagonists; D017294:Ondansetron; D011739:Pyrimethamine