SEARCH Articles Figures Tables Cationic surfactants chromatography Further purification of the microbubble surfactant mixture by gel-filtration column chromatography High performance liquid chromatography anionic surfactants High performance liquid chromatography cationic surfactants High-performance liquid chromatography surfactants Micellar electrokinetic chromatography surfactant Micellar electrokinetic chromatography surfactants used Polymeric surfactant electrokinetic chromatography