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The method consists of (i) an electrophoretic separation based on micellar electrokinetic capillary chromatography, which uses sodium dodecyl sulfate (SDS) as surfactant; (ii) a sample stacking technique called reverse electrode polarity stacking mode (REPSM); and (iii) direct UV detection. The background electrolyte that gave complete separation contained 20\u00a0m<jats:sc>M<\/jats:sc> sodium borate buffer and 60\u00a0m<jats:sc>M<\/jats:sc> SDS. The sensitivity of the method was improved by an enrichment step that used on\u2010column stacking. 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