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A diol-bonded silica monolith capillary column as polar stationary phase was successfully prepared for capillary electrochromatography. The preparation of monolithic stationary phase was based on the individual silica matrix forming and subsequent chemical bonding by (3-glycidoxypropyl) trimethoxysilane to produce the desired function. The diol-bonded silica monolith has been successfully employed in the electrochromatographic separation of alkaloids. The effects of experimental parameters, such as the volume fraction of the organic modifier, pH value, and ionic strength of the buffer on the retention behavior of the solutes were investigated. Column efficiencies greater than 110,000 plates/m for separation of basic compounds were obtained. It was observed that retention of alkaloids on the diol-bonded silica monolith was mainly contributed to a reversed-phase and cation-exchange mechanism, and electrophoresis of basic compounds also played a role in separation.

Electrochromatographic Evaluation of Diol-Bonded Silica Monolith Capillary Column for Separation of Basic Compounds