title: High-performance liquid chromatographic analysis of ondansetron enantiomers in human serum using a reversed-phase cellulose-based chiral stationary phase and solid-phase extraction.
abstract: A stereospecific HPLC method was developed for the assay of R-(-)- and S-(+)-ondansetron enantiomers in human serum. The method involves the use of solid-phase extraction for sample clean-up and is also free of interference from 6-hydroxyondansetron, 7-hydroxyondansetron and 8-hydroxyondansetron, the three major metabolites of ondansetron. Chromatographic resolution of the enantiomers was performed on a reversed-phase cellulose-based chiral column (Chiralcel OD-R) under isocratic conditions using a mobile phase consisting of 0.7 M sodium perchlorate-acetonitrile (65:35, v/v) at a flow-rate of 0.5 ml/min. Recoveries at 200 ng/ml levels were more than 90% for both ondansetron enantiomers. Intra-day and inter-day precisions calculated as R.S.D.s were in the 0.3-5% and 2-8% ranges for both enantiomers, respectively. Intra-day and inter-day accuracies calculated as percent error were in the 0.3-11.5% and 0-3% ranges for both enantiomers, respectively. Linear calibration curves were obtained for each enantiomer in serum in the concentration range 15-750 ng/ml. The limit of quantitation of each enantiomer was 15 ng/ml. The detection limit for each enantiomer in serum using UV detection at 210 nm was 7 ng/ml (S/N=2).
authors.affiliation: Department of Medicinal Chemistry, College of Pharmacy, University of Georgia, Athens 30602-2352, USA.
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: J T
authors.initials: JT
authors.lastname: Stewart
mesh_terms: D000932:Antiemetics / Q000097:blood*; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D017294:Ondansetron / Q000097:blood*; D011985:Receptors, Serotonin / Q000378:metabolism*; D044406:Receptors, Serotonin, 5-HT3; D012680:Sensitivity and Specificity; D012702:Serotonin Antagonists / Q000097:blood*; D013056:Spectrophotometry, Ultraviolet; D013237:Stereoisomerism
chemical_list: D000932:Antiemetics; D011985:Receptors, Serotonin; D044406:Receptors, Serotonin, 5-HT3; D012702:Serotonin Antagonists; D017294:Ondansetron