多巴胺在聚3,4-吡啶二羧酸修饰电极上的电化学行为及其测定

The Electrochemical Behavior of Dopamine on Poly (cinchomeronic acid) Modified Glassy Carbon Electrode and Its Detection

制备了聚3,4-吡啶二羧酸修饰电极,研究了多巴胺在修饰电极上的电化学行为。结果表明聚3,4-吡啶二羧酸聚合物膜对多巴胺的氧化具有明显的催化作用,并且可以消除抗坏血酸对多巴胺测定中的干扰。多巴胺的浓度在2.0×10-6～4.0×10-5mol/L内与其氧化电流呈线性关系,相对标准偏差为3.2%(n=10),检出限为8.0×10-8mol/L。将该修饰电极用于分析模拟样品和注射液样品中的多巴胺,分析结果表明,该修饰电极有望用于实际样品分析。

Poly(cinchomeronic acid) modified glassy carbon electrode was fabricated through electropolymerization. The electrochemical behavior of dopamine (DA) on the modified electrode was investigated. Results showed that the polymer exert an apparent catalytic effect on oxidation of DA. The oxidation current of DA is in linear relationship with its concentration in a range of 2.0×10-6～4.0×10-5mol/L.The detection limit and detection precision for DA are 8.0×10-8mol/L and 3.2% RSD (n=10) respectively. The modified electrode was applied to the synthesized sample and injection sample analysis. The results are in good agreement with the standard values, which suggests it is hopeful for this modified electrode to be used in real sample analysis.