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Effect of drying on the degradation of cationic surfactants and separation performance in capillary zone electrophoresis of inorganic anions

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Harakuwe, AH and Haddad, PR and Davies, NW (1999) Effect of drying on the degradation of cationic surfactants and separation performance in capillary zone electrophoresis of inorganic anions. Journal of Chromatography A, 863 (1). pp. 81-87. ISSN 0021-9673

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Abstract

Tetradecyltrimethylammonium bromide (TTAB) is used in capillary zone electrophoresis (CZE) to control the direction and magnitude of the electroosmotic flow and the migration time of analyte anions. Drying of the hygroscopic TTAB at 100°C overnight has been found to influence the final CZE separation by providing improved resolution, precision of migration times, and enhanced detection response for hydrogenphosphate. Chemical analysis of the dried TTAB using IR and GC–MS indicated the presence of small amounts of an unexpected tertiary alkylamine, tetradecyldimethylamine. This amine appears to contribute to the improved separation, probably by making more effective the masking of silanophilic activity at the capillary surface and/or generating a more stable double-layer.

Item Type: Article
Keywords: Inorganic anions; Surfactants; Tetradecyltrimethylammonium bromide; Tetradecyldimethylamine
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 81-87
ISSN: 0021-9673
Identification Number - DOI: 10.1016/S0021-9673(99)00952-8
Additional Information: The definitive version is available at http:..www.sciencedirect.com
Date Deposited: 31 Oct 2008 06:15
Last Modified: 18 Nov 2014 03:52
URI: http://eprints.utas.edu.au/id/eprint/7933
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