关键词: 毛细管电泳, 电化学检测, 红葡萄酒, 多元酚

Abstract: Asimultaneous 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, pHand concentration of running buffer, separation voltage and injection time on CE EDwere investigated. Under the optimum conditions, these six analytes could be separated in a 100 mmol/Lborate buffer(pH=924) within₃₀ min. A 300 μm diameter carbon disk electrode has a good response at +085 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/mLto 14×10^-7 g/mLfor 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.

Key words: Capillary zone electrophoresis, Electrochemical detection, Red wine, Phenols