title: Enantioselective determination of terazosin in human plasma by normal phase high-performance liquid chromatography-electrospray mass spectrometry.
abstract: A sensitive and selective analytical method for the enantioselective determination of terazosin in human plasma has been developed. The chromatography is based on the normal-phase chiral separation utilizing the analogue prazosin as the internal standard. The detection involves the direct introduction of the normal-phase eluent into an electrospray source followed by mass-selective detection. No pre-column derivatization was required prior to analysis. The chiral stationary phase used was Chiralpak AD 100 mm x 2.1 mm I.D. (10 microns particle size). The method was utilized to determine the concentrations of terazosin enantiomers in human subjects following a 5 mg single oral dose. Results were compared with those from an enantioselective HPLC-fluorescence method from the same subject plasma samples. The LC-MS results confirm with confidence that the two terazosin enantiomers have different elimination profiles.
authors.affiliation: Hewlett-Packard (Canada) Ltd., Chemical Analysis Division, Mississauga, Ontario, Canada.
authors.forename: A P
authors.initials: AP
authors.lastname: Zavitsanos
authors.forename: T
authors.initials: T
authors.lastname: Alebic-Kolbah
mesh_terms: D000317:Adrenergic alpha-Antagonists / Q000097:blood*; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D007202:Indicators and Reagents; D013058:Mass Spectrometry; D011224:Prazosin / Q000031:analogs & derivatives* / Q000097:blood; D013050:Spectrometry, Fluorescence; D013237:Stereoisomerism
chemical_list: D000317:Adrenergic alpha-Antagonists; D007202:Indicators and Reagents; C041226:Terazosin; D011224:Prazosin