基于聚L-精氨酸修饰玻碳电极的抗坏血酸电化学传感器的研究

Electrochemical sensor of ascorbic acid based on glassy carbon electrode modified with poly( L-arginine)

研究了电化学方法制备聚L-精氨酸修饰电活化玻碳电极（PLA／GCME）即抗坏血酸电化学传感器及抗坏血酸（AA）在该传感器上的电化学行为。结果表明，传感器对AA具有较好的催化作用。AA的氧化峰电流与其浓度在1．0×10-2～1．0×10-5mol／L范围内呈现良好的线性关系，检出限为6．71×10-6mol／L。传感器具有良好的重现性和稳定性。该方法用于实际样品的测定，回收率在98．3％～104．1％之间。

A poly （L-arginine） modified electrochemically activated glassy carbon electrode （PLA/CME） is prepared through cyclic voltammetry （CV）, named as ascorbic acid （AA） electrochemical sensor. The electrochemical behavior of AA on this sensor is studied. The results indicate that electrochemical oxidative process of AA is catalyzed by the sensor. The oxidative peak current is linearly increased with the concentration of AA in the range of 1.0 × 10 -2 ～ 1.0 × 10-5 mol L-1. The detection limit for AA is 6. 71 × 10-6 mol L-1. The sensor turns out to have good stability and reproduction quality. The proposed method is used in the analysis of practical samples with recovery rate in the range of 98.3% - 104. 1%.