title: Simultaneous quantitation of paracetamol, caffeine, pseudoephedrine, chlorpheniramine and cloperastine in human plasma by liquid chromatography-tandem mass spectrometry.
abstract: A rapid and sensitive method based on liquid chromatography-tandem mass spectrometry (LC-MS/MS) for the simultaneous quantitation of paracetamol, caffeine, pseudoephedrine, chlorpheniramine and cloperastine in human plasma has been developed and validated. After sample preparation by liquid-liquid extraction, the analytes and internal standard (diphenhydramine) were analyzed by reversed-phase HPLC on a Venusil Mp-C(18) column (50mmx4.6mm, 5microm) using formic acid:10mM ammonium acetate:methanol (1:40:60, v/v/v) as mobile phase in a run time of 2.6min. Detection was carried out by electrospray positive ionization mass spectrometry in the multiple-reaction monitoring mode. The method was linear for all analytes over the following concentration (ng/ml) ranges: paracetamol 5.0-2000; caffeine 10-4000; pseudoephedrine 0.25-100; chlorpheniramine 0.05-20; cloperastine 0.10-40. Intra- and inter-day precisions (as relative standard deviation) were all < or =11.3% with accuracy (as relative error) of +/-5.0%. The method was successfully applied to a study of the pharmacokinetics of the five analytes after administration of a combination oral dose to healthy Chinese volunteers.
authors.affiliation: Research Center for Drug Metabolism, College of Life Science, Jilin University, Changchun 130021, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Jiang
authors.initials: J
authors.lastname: Wang
authors.forename: Yao
authors.initials: Y
authors.lastname: Jiang
authors.forename: J Paul
authors.initials: JP
authors.lastname: Fawcett
authors.forename: Jingkai
authors.initials: J
authors.lastname: Gu
mesh_terms: D000082:Acetaminophen / Q000097:blood*; D002110:Caffeine / Q000097:blood*; D002744:Chlorpheniramine / Q000097:blood*; D002853:Chromatography, Liquid / Q000379:methods; D005069:Evaluation Studies as Topic; D006801:Humans; D008297:Male; D010880:Piperidines / Q000097:blood*; D054199:Pseudoephedrine / Q000097:blood*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D010880:Piperidines; D000082:Acetaminophen; D002110:Caffeine; D002744:Chlorpheniramine; C040282:cloperastine; D054199:Pseudoephedrine