SEPARATION OF NONIONIC SURFACTANTS OF THE POLYOXYETHYLENE TYPE BY CAPILLARY ELECTROPHORESIS

Nonionic surfactants are widely used in commercial formulations as com plex mixtures requiring efficient and selective separation methods. Ca pillary electrophoretic separations were carried out in electrolytes c ontaining high amounts of organic solvents and anionic surfactants bas ed on the formation of association complexes between analytes and anio nic surfactants without micelle formation. Octyl- and nonylphenol poly ethoxylates were separated as their ethoxylate homologues. Influences of the electrophoretic conditions like electrolyte concentration and p H, type and content of anionic surfactant and organic solvents were in vestigated.