黄嘌呤在离子液体-纳米金-碳纳米管复合物修饰电极上的电化学行为

Electrochemical Behaviors of Xanthine at a Carbon Nanotuble-Ionic Liquids-Nanogold Complex Modified Electrode

研究了黄嘌呤在离子液体-纳米金-碳纳米管修饰玻碳电极上的电化学行为。结果表明,在0.1mol/L磷酸盐(pH=4.4)介质中,修饰电极对黄嘌呤氧化具有强的电催化作用,黄嘌呤在0.9V(vs.SCE)左右产生一灵敏的氧化峰。在优化的实验条件下,用此峰测定黄嘌呤的线性范围为1.5×10-7～1.0×10-5mol/L,检出限为3.5×10-8mol/L。该修饰电极具有良好的重现性和稳定性。

The electrochemical behavior of xanthine on the multi-wall carbon nanotuble（MCNT）-ionic liquids-nanogold modified electrode was investigated. The results showed that the modified electrode exhibited electrocatalysis to xanthine oxidation in 0.1 mol/L phosphate buffer（pH=4.4）. The oxidation peak potential was about 0.9 V（vs.SCE）. The oxidation peak current was linear to the concentration of xanthine in the range of 1.5×10-7～1.0×10-5 mol/L. The detection limit was about 3.5×10-8 mol/L. This method was applied to the determination of xanthine in simulant samples with satisfactory results.