NDLI: Base-induced transient isotachophoretic stacking of acidic drugs in capillary zone electrophoresis.

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Base-induced transient isotachophoretic stacking of acidic drugs in capillary zone electrophoresis.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Quirino, Joselito P.
Description	Country affiliation: Australia Author Affiliation: Quirino JP ( Australian Centre for Research on Separation Science, School of Chemistry, University of Tasmania, Hobart, Australia. jquirino@utas.edu.au)
Abstract	Online sample concentration of acidic drugs by transient isotachophoresis (t-ITP) with the injection of a base is described in capillary zone electrophoresis (CZE). A positively coated capillary was conditioned with background electrolyte (ammonium acetate at pH 6). A long plug of sample solution (S) prepared in ammonium acetate was then hydrodynamically injected followed by the base (tetrapropylammonium hydroxide). A negative voltage was applied and caused the hydroxide ions from the base to penetrate the S zone and created a pH junction that swept through the S zone. The analytes stack at the junction where the mechanism of focusing was transient ITP with the acetate and hydroxide ions as leading and terminating ions, respectively. The concentrated analytes separated in co-EOF CZE once the hydroxide was exhausted. The base stacking strategy was tested using hypolipidemic, nonsteroidal anti-inflammatory, and diuretic drugs, and afforded 19-37 improvements in peak height.
File Format	HTM / HTML
ISSN	16159306
Issue Number	9
Journal	Journal of Separation Science
Volume Number	34
e-ISSN	16159314
Language	English
Publisher	Wiley-VCH
Publisher Date	2011-05-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Analytical Discipline Chemistry Electrophoresis, Capillary Methods Isotachophoresis Pharmaceutical Preparations Chemistry Evaluation Studies Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Filtration and Separation

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