Capillary electrochromatography: normal-phase mode using silica gel and cellulose-based packing materials

Cellulose-based packings and native silica gel have been employed as stationary phases in normal-phase capillary electrochromatography. The electroosmotic flow produced with non-aqueous mobile phases (acetonitrile, methanol, hexane-ethanol-methanol) is sufficiently high (mobility up to mu(eo)=0.152 cm(2) s(-1) kV(-1)) and stable for chromatographic separations. Only electroosmotic flow has been used for the propulsion of the mobile phase through the chromatographic packings. The elution order obtained with a mixture of test solutes corresponds to the elution order expected for normal-phase chromatography. (C) 1997 Elsevier Science B.V.