Separation of alkylbenzyl quaternary ammonium compounds by capillary zone electrophoresis with sample stacking injection |
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Authors: | A Viña Orjales M I Turnes Carou M C Prieto Blanco P López Mahía S Muniategui Lorenzo D Prada Rodríguez |
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Institution: | 1. Department of Analytical Chemistry, University of A Coru?a, A Zapateira, 15071, A Coru?a, Spain
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Abstract: | Summary A systematic investigation of operational buffer systems, sample preparation and instrument parameters for achieving the best
possible performance for determinating an homologous series of N-benzyl-N-alkyl-N,N-dimethylammonium chloride compounds by
capillary zone electrophoresis with direct UV detection. The most effective separation was achieved within 3.5 min with the
addition of acetonitrile (40%) in a phosphate buffer (20 mM pH 5.2) using a 40 cm fused-silica capillary operating at 25 KV
and 20°C. Degassing of all electrolyte solutions and samples was very important. The linearity and repeatability for each
compounds were satisfactory. To improve detection limits, on-column sample preconcentration, sample stacking, was investigated
achieving a tenfold enrichment factor and quantitation limits about 10−7M. |
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Keywords: | Capillary zone electrophoresis Sample stacking Alkylbenzyl quaternary ammonium compounds Surfactants |
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