title: Simultaneous enantioseparation and sensitivity enhancement of basic drugs using large-volume sample stacking.
abstract: Simultaneous enantioseparation with sensitive detection of four basic drugs, namely methoxamine, metaproterenol, terbutaline and carvedilol, using a 20-mum ID capillary with native beta-CD as the chiral selector was demonstrated by the large-volume sample stacking method. The procedure included conventional sample loading either hydrodynamically or electrokinetically at longer injection times without polarity switching and EOF manipulation. In comparison to conventional injections, depending on the analyte, about several hundred- and a thousand-fold sensitivity enhancement was achieved with the hydrodynamic and the electrokinetic injections, respectively. The simple method developed was applied to the analysis of racemic analytes in serum samples and better recovery was achieved using hydrodynamic injection than electrokinetic injection.
authors.affiliation: School of Materials Science, Toyohashi University of Technology, Toyohashi 441-8580, Japan.
authors.forename: Nerissa L
authors.initials: NL
authors.lastname: Deñola
authors.forename: Noel S
authors.initials: NS
authors.lastname: Quiming
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Saito
authors.forename: Kiyokatsu
authors.initials: K
authors.lastname: Jinno
mesh_terms: D000316:Adrenergic alpha-Agonists / Q000097:blood; D000318:Adrenergic beta-Agonists / Q000097:blood; D002138:Calibration; D002227:Carbazoles / Q000097:blood*; D000077261:Carvedilol; D005591:Chemical Fractionation / Q000295:instrumentation / Q000379:methods; D016903:Drug Monitoring / Q000379:methods; D019075:Electrophoresis, Capillary / Q000379:methods*; D006801:Humans; D007202:Indicators and Reagents; D009921:Metaproterenol / Q000097:blood*; D008729:Methoxamine / Q000097:blood*; D011412:Propanolamines / Q000097:blood*; D018401:Sample Size; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013237:Stereoisomerism; D013726:Terbutaline / Q000097:blood*; D047392:beta-Cyclodextrins / Q000737:chemistry