研究了聚L_天冬氨酸修饰电极的制备及其电化学性质。实验表明 ,该修饰电极对神经递质多巴胺的电化学氧化有显著的催化作用 ,使电极反应过程的可逆性变好 ,峰电流明显增大。采用差示脉冲伏安法对多巴胺进行定量分析 ,线性范围为 1 0× 10 - 7～ 1 0× 10 - 4 mol L ,检出限为 5 0× 10 - 8mol L。该聚合物修饰电极具有良好的选择性 ,能有效地排除抗坏血酸对测定的影响 ,用于合成样品分析 ,结果令人满意。 The preparation and electrochemical properties of poly (L-aspartic acid) modified electrode were studied. Experiments show that the modified electrode has a significant catalytic effect on the electrochemical oxidation of neurotransmitter dopamine, the reversibility of the electrode reaction process becomes better, and the peak current is significantly increased. Dopamine was quantitatively analyzed by differential pulse voltammetry with a linear range of 10 × 10 -7 -1 0 × 10 -4 mol L and a detection limit of 50 × 10 -8 mol L -1. The polymer modified electrode has good selectivity, can effectively exclude the impact of ascorbic acid on the determination for the synthesis of sample analysis, the results are satisfactory.