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Separation of multiply charged anions by capillary electrophoresis using alkyl phosphonium pairing agents
Qing Feng1, Eranda Wanigasekara, Zachary S Breitbach
1Department of Chemistry and Biochemistry, The University of Texas, Arlington, TX, USA.
Abstract:
Two newly developed UV transparent phosphonium-based cationic reagents were evaluated as background electrolyte additives for capillary electrophoresis for the separation of multiply charged anions, including several complex anions. These cationic reagents showed moderate suppression of the electroosmotic flow, interacted with the analytes to improve their separation and often improved the peak shape. The effects of the additives and their concentration on the separation were studied, as well as the buffer type, pH, and voltage. The dicationic reagent effectively separated eight divalent anions within 17 min and the tetracationic reagent best separated nine trivalent anions, as well as a mixture of all the anions.
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