黄嘌呤在多壁炭纳米管化学修饰的玻炭电极上伏安行为的研究

On Voltammetric Determination of Xanthine at Glassy Carbon Electrode Modified by Multi-wall Carbon Nanotubes

研究了黄嘌呤在多壁炭纳米管化学修饰的玻炭电极上的伏安行为,其结果表明,在0.1mol·L-1磷酸盐(pH=6.5)介质中,修饰电极对黄嘌呤具有强力的吸附催化作用,其催化电流与黄嘌呤浓度在310-8～610-5mol·L-1范围内线性关系,检出限为110-8mol·L-1. 利用本法测定了人体血清中黄嘌呤的含量,效果颇佳.

The voltammetric behavior of Xanthine at the multi-wall carbon nanotubes modified glassy carbon electrode is studied. The results show that the modified electrode exhibits electrocatalyticactivity to Xanthine in 0.1 mol·L-1 phosphate buffer (pH=6.5). The oxidation peak current is linear with the concentration of Xanthine over the range from 3 10-8 mol·L-1 to 6?0-5 mol·L-1. The detection limit was 1×10-8 mol·L-1. The proposed procedure was successfully applied to detect XA in human serum without any preliminary treatment.