Abstract
AbstractA novel mixed‐mode stationary phase for open tubular capillary electrochromatography (CEC) was prepared. With 3‐aminopropyltrimethoxysilane as the spacer, the chemical reagent in conjunction with the fullerene played an important role in the electrochromatographic separation of the plant phenols. The fullerene C 60‐based column has the properties of both hydrophilic and hydrophobic interaction sites and provides a positively charged capillary surface responsible for the reversed electroosmotic flow (EOF) in the column during CEC operation. Comparative studies for the fullerene‐bonded phase, the intermediate phase with amino group and the bare fused‐silica were carried out. Under the conditions of acetate buffer (20 mM, pH 5.0) and applied voltage of −15 kV, the separation of catechin, salicylic acid, myricetin, quercetin, gallic acid, caffeic acid and p‐coumaric acid could be achieved. The proposed method was also applied to the analysis of plant phenols in grape juice.
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