MICELLE POLYMERS AS PSEUDOSTATIONARY PHASES IN MEKC - CHROMATOGRAPHICPERFORMANCE AND CHEMICAL SELECTIVITY

Two micelle polymers, sodium polyundecenyl sulfate and sodium polyunde cylenate, have been synthesized, purified, and characterized as pseudo stationary phases for micellar electrokinetic chromatography, The poly mers have been characterized by size exclusion chromatography, laser l ight scattering, and electrokinetic chromatography, When employed as p seudostationary phases, the micelle polymers were found to provide sel ective and efficient separations, In aqueous buffers, the chromatograp hic properties of the polymers were similar to those of sodium dodecyl sulfate (SDS) micelles, The efficiency was found to be similar to tha t of SDS micelles, The electrophoretic mobility of the polymers was gr eater than SDS micelles, providing an extended migration time range, T he chemical selectivity of the two polymers was found to be very simil ar, However, both of the polymers are more polar than SDS micelles, In buffers modified with high concentrations of organic solvents, the ch romatographic properties of sodium polyundecenyl sulfate were found to be superior to those of SDS micelles, Separations of polynuclear arom atic hydrocarbons in acetonitrile- and methanol-modified buffers are m uch improved using the sulfate polymer relative to SDS micelles, The s tructural selectivity of the undecenyl sulfate polymer pseudostationar y phase for the separation of polynuclear aromatic hydrocarbons in org anic-modified buffer media was found to be affected by the organic mod ifier used.