左旋多巴在单层碳纳米管修饰电极上的电化学行为

Electrochemical behavior of L-3,4-dihydroxyphenylalanine at the SWNT-modified electrode

单层碳纳米管修饰电极对左旋多巴的电化学氧化还原具有很高的催化活性。在pH4.6的0.1mol/LHAc NaAc缓冲溶液中,可得到一对峰形很好的氧化还原峰。电极反应受扩散控制,反应过程中电子的得失伴随着等量的质子参与。氧化峰电流与左旋多巴浓度在2.1×10-4～5.0×10-6mol/L范围内成线性关系,检出限为2.0×10-6mol/L。

The single-wall carbon nanotube(SWNT)-modified electrode showed high electrocatalytic activity toward oxidation of L-3,4-dihydroxyphenylalanine(LDA). The electrode reaction was a diffusion-controlled process and the peak potential was shown to be pH dependent. The peak current was found to increase linearly with the LDA concentration in the range of 2.1×10^(-4)～5.0×10^(-6) mol/L with the detection limit of 2.0×10^(-6) mol/L.