DOUBLE-CHAIN SURFACTANT AS A NEW AND USEFUL MICELLE-FORMING REAGENT FOR MICELLAR ELECTROKINETIC CHROMATOGRAPHY

Disodium l)-4,7,10,13-tetraoxa-1,16-hexadecanedisulphonate, a surfacta nt with two ionic groups and two lipophilic chains, was first utilized in micellar electrokinetic chromatography (MEKC). A good linear relat ionship was obtained between the capacity factors of several model ana lytes tested and the concentrations of the surfactant. Compared with w idely used sodium dodecyl sulphate, this new surfactant exhibited rema rkably different selectivity for several substituted naphthalene and b enzene derivatives and gave a wider migration time window. MEKC could be performed at surfactant concentrations at most one order of magnitu de lower, because of the low critical micelle concentration.