抗坏血酸在2-氨基吡啶修饰电极上的电催化氧化及其应用

Electrocatalytic Oxidation of Ascorbic Acid on 2-Pyridinamine Modified Glass Carbon Electrode and Its Analytical Application

研究了 2 -氨基吡啶聚合膜修饰玻碳电极的制备及其电化学性质 ,修饰电极对抗坏血酸 ( AA)的氧化有明显的催化作用 ,其氧化电位负移 2 72 m V。在 p H5 .7的B.R.缓冲溶液中 ,以 1 5 0 m V为工作电位 ,AA在修饰电极上的响应电流与 AA的浓度在 4× 1 0 - 6～ 1 0 - 3 mol/ L范围内呈良好的线性关系 ,检出限为 1 .3× 1 0 - 6mol/ L。在此条件下 ,多巴胺 ( DA)对 AA无干扰 ,电极重现性良好 ,可用于实际样品中

The preparation and electrochemical characteristics of electrode modified by 2 pyridinamine are described. The 2 pyridinamine polymer modified electrode has strong electro catalytic effect on the oxidation of ascorbic acid. The anodic peak potential of ascorbic acid shifted negatively by 272 mV. A sensitive amperometric response for ascorbic acid was obtained which covered a linear range from 4.0×10 -6 to 1.0×10 -3 mol/L. The modified electrode showed good stability and reproducibility. The electrode was used to the determination of ascorbic acid in vitamin C tablet and tomato, and the analytical results coincides well with conventional methods.