A simultaneous determination of (-) epictechin, (+) catechin, gentisic acid, ferulic acid, quercetin and gallic acid in red wine by capillary zone electrophoresis with electrochemical detection(CE ED) was reported. The effects of potential of working electrode, pH and concentration of running buffer, separation voltage and injection time on CE ED were investigated. Under the optimum conditions, these six analytes could be separated in a 100 mmol/L borate buffer(pH=9 24) within 30 min. A 300 μm diameter carbon disk electrode has a good response at +0 85 V( vs . SCE) for all analytes. The responses were linear over two orders of magnitude with detection limit( S/N =3) ranged from 7×10 -8 g/mL to 1 4×10 -7 g/mL for all six analytes. This method has been used for the determination of these analytes in red wine without enrichment, and the assay result was satisfactory.
