title: Simultaneous determination of enantiomers of structurally related anticholinergic analogs in human serum by liquid chromatography-electrospray ionization mass spectrometry with on-line sample cleanup.
abstract: Trihexyphenidyl, biperiden and procyclidine are anticholinergic drugs produced as racemates for the treatment of Parkinson's disease. This paper describes a simple and sensitive LC-MS method for the simultaneous determination of these compounds in human serum. An on-line sample clean-up procedure was used, where serum samples were directly injected into a "restricted-access media" pre-column. After the exclusion of the serum proteins, the drug molecules were eluted to a beta-cyclodextrin analytical column for chiral separation. The quantitation was done by electrospray ionization MS using diphenidol as an internal standard. The method developed has limits of detection of 1 ng/ml, at least two-orders-of-magnitude linear dynamic ranges (r>0.999), and RSDs of less than 10%. The system can be completely automated for increased sample throughput and unattended analyses.
authors.affiliation: Department of Chemistry, Cleveland State University, OH 44115, USA.
authors.forename: V
authors.initials: V
authors.lastname: Cápka
authors.forename: Y
authors.initials: Y
authors.lastname: Xu
mesh_terms: D018680:Cholinergic Antagonists / Q000097:blood* / Q000737:chemistry; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013237:Stereoisomerism
chemical_list: D018680:Cholinergic Antagonists