Abstract
A mixture of 22 phenylthiohydantoin-amino acids was separated by electrokinetic chromatography with a sodium dodecyl sulphate (SDS) solution and a 650 × 0.05 mm I.D. fused-silica tube. This chromatography is based on micellar solubilization and electrokinetic migration in an open-tubular capillary. The retention times of the solutes could be controlled by changing the SDS concentration, the applied voltage or the length of the separation tube. Dodecyltrimethylammonium bromide (DTAB) solutions were also employed. The separation characteristics with SDS solutions were completely different from those with DTAB solutions. The resolutions were better with the former than with the latter solution, but for some solutes the latter gave better results.
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