Abstract
The capillary electrochromatographic (CEC) separation of a range of pharmaceutical bases was investigated on a commercially available silica stationary phase using aqueous mobile phases. The effects of mobile phase composition, buffer pH, applied voltage, and buffer anion on the retention behaviour of these bases were studied. Promising chromatography was obtained at pH 7.8 but was later found to be irreproducible. However, successful and reproducible chromatography of the bases was achieved at pH 2.3.
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