银微盘电极上L－半胱氨酸的伏安行为研究

Studies on Voltammetric Behavior of L-Cysteine at Silver Microdisk Electrode

银微盘电极上Ｌ－半胱氨酸的伏安行为研究方宾，方惠群，陈洪渊（南京大学化学系，南京，２１００９３）关键词银微盘电极，Ｌ－半胱氨酸，循环伏安法由碳纤维、金、铂、铱等材料制成微电极的研究国内、外报道甚多［１～５］，但以银为材料制成的电极在生化物质方面的研究...

In this paper, the voltammetric behavior of L-cysteine at silver microdisk elelectrode in 0.2 mol/L HAc-NaAc buffer solution was investigated. The mechanism of electrode reaction was discussed. The possibility of the determination of L-cysteine by cathodic stripping voltammetry was examined experimentally. The dependence of reduction peak current of Ag(L-Cys) on the L-Cys concentration in the range of 5. 0x10-5～2.0x 10-3 mol/L is linear.The method has been used for determination of mixed samples with satisfactory results.