中文摘要：

通过电聚合的方法构置了桑色素功能化碳纳米管修饰电极（morin／MwNTs／GcE），以多巴胺（DA）和抗坏血酸（AA）为模型化合物，考察了该修饰电极的电催化作用与机理。结果表明：DA与AA在Morin／MWNTs／GCE上的峰电流比裸电极、碳纳米管修饰电极明显增大，氧化峰电位差达210mV，可实现多巴胺的灵敏测定。AA存在下，DA在1．0×10^-7～5．0×10^-4mol／L浓度范围内与峰电流有良好的线性关系，方法检出限2．0×10^-8mol／L。

英文摘要：

A novel modified electrode （morin/MWNTs/GCE） was constructed by electro-polymerizing morin onto multi-walled carbon nanotubes on the surface of glassy carbon electrodes. Taking dopamine （DA） and ascorbic acid （AA） as model compounds, the modified electrode showed good electro- catalytic effect, at the same time the mechanism was studied. The oxidation peak current of DA and AA were the biggest than that at bare and MWNT modified electrodes, with the anodic peak potential difference （AEp.） was 210 mV. A differential pulse voltammetric technique for measurement of dopa- mine over the range of 1.0×10^-7～5.0×10^-4mol/L had been developed in the presence of AA. The detection limit was 2.0× 10^-8 mol/L.