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Sweeping of alprenolol enantiomers with an organic solvent and sulfated β-cyclodextrin in capillary electrophoresis


Rabanes, HR and Quirino, JP, Sweeping of alprenolol enantiomers with an organic solvent and sulfated β-cyclodextrin in capillary electrophoresis, Electrophoresis, 34, (9-10) pp. 1319-1326. ISSN 0173-0835 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

DOI: doi:10.1002/elps.201200595


Sweeping, an on-line sample concentration technique in CE, is the picking and accumulation of analytes by the pseudostationary phase or complexing additive. In the presence of an electric field, the analytes concentrated at the additive front that initially penetrated the sample zone. Here, we describe the sweeping of cationic alprenolol enantiomers using sulfated β-CD and organic solvent. The separation solution contained the anionic additive while ACN was in the sample solution. With fused silica capillaries, positive polarity, and solutions buffered at pH 3, the direction of the enantiomers' effective electrophoretic mobility was the same as the electrophoretic mobility (or electrophoretic mobility without additive). When the amount of ACN in the sample was increased (i.e. 60%), the interaction between the analytes and additive became negligible. This caused the sweeping boundary to shift from the electrophoretically moving β-CD front to the zone between the sample and separation solution. The equation that described the narrowing of injected sample zone was derived. The performance of sweeping with 60% ACN in the sample was then studied under different operating conditions (e.g. type of injection, injection time, and CD concentration). The low interaction between enantiomers and additive gave only moderate increases in sensitivity (approximately tenfold), but was improved when field enhancement was used during electrokinetic injection. With a conductivity difference (separation/sample solution) of 70 and a short injection time of 30 s at 20 kV, peak improvements of >100-fold was easily achieved.

Item Details

Item Type:Refereed Article
Keywords:sweeping, capillary electrophoresis, enantiomers, organic solvent, sulfated cyclodextrin
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Separation science
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Rabanes, HR (Ms Heide Rabanes)
UTAS Author:Quirino, JP (Associate Professor Lito Quirino)
ID Code:89028
Year Published:2013
Funding Support:Australian Research Council (FT100100213)
Web of Science® Times Cited:15
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2014-02-24
Last Modified:2014-05-09

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