STARBURST DENDRIMER-SUPPORTED PSEUDOSTATIONARY PHASES FOR ELECTROKINETIC CHROMATOGRAPHY

Pseudo-stationary phases for electrokinetic chromatography were prepar ed by the alkylation of starburst dendrimers (SBDs), The SBD-supported pseudo-stationary phase with dodecyl groups showed higher efficiency than short-alkyl derivatives, and maintained the hydrophobic property in the presence of methanol, The dodecyl-modified SBD provided,vide mi gration time windows at high methanol content to effect the separation of sixteen aromatic hydrocarbons, the priority pollutants designated by EPA, in 65% methanol, The selectivity of polymer-supported pseudo-s tationary phase can be varied simply by changing the length of the alk yl groups, The dodecyl SBD showed relatively similar selectivity as so dium dodecyl sulfate micelle, whereas short alkyl derivatives showed p reference toward rigid and planar compounds based on the rigid polymer backbones, The selectivity of SBD-supported pseudo-stationary phases was dominated by the chain length of the alkyl groups, with the minor effect of the structure of the core and the generation of the SBD wher e alkyl groups were attached.