title: Sensitive sulphur-specific detection of omeprazole metabolites in rat urine by high-performance liquid chromatography/inductively coupled plasma mass spectrometry.
abstract: The use of high-performance liquid chromatography/inductively coupled plasma mass spectrometry (HPLC/ICPMS) with sulphur-specific detection was investigated as a method for obtaining metabolite profiles for the drug omeprazole administered as a 1:1 mixture of (32)S- and (34)S-labelled material. Analysis based on the monitoring of the chromatographic eluent at either m/z 32 or 34 was not successful due to insufficient sensitivity caused by interferences from polyatomic ions. However, reaction of sulphur with oxygen in the hexapole collision cell, combined with monitoring at m/z 48 (for (32)S) or m/z 50 (for (34)S), provided a facile method for metabolite profiling. Detection of m/z 48 was superior in sensitivity to detection of m/z 50.
authors.affiliation: Department of Drug Metabolism and Pharmacokinetics, AstraZeneca, Mereside, Alderley Park, Macclesfield SK10 4TG, UK.
authors.forename: Berit Packert
authors.initials: BP
authors.lastname: Jensen
authors.forename: Christopher
authors.initials: C
authors.lastname: Smith
authors.forename: Ian D
authors.initials: ID
authors.lastname: Wilson
authors.forename: Lars
authors.initials: L
authors.lastname: Weidolf
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D008297:Male; D013058:Mass Spectrometry / Q000379:methods*; D015394:Molecular Structure; D009853:Omeprazole / Q000737:chemistry / Q000378:metabolism* / Q000652:urine*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012680:Sensitivity and Specificity; D013455:Sulfur / Q000032:analysis*
chemical_list: D013455:Sulfur; D009853:Omeprazole