咖啡酸甲酯的电化学行为

Electrochemical Behavior of Methyl Caffeate

采用循环伏安法研究了咖啡酸甲酯在玻碳电极上的电化学行为。在pH 4.8的乙酸-乙酸钠缓冲溶液中,咖啡酸甲酯在0.342 V和0.331 V处呈现出一对氧化还原峰,电化学过程中咖啡酸甲酯的电子转移数为2,参与反应的质子数也为2。咖啡酸甲酯的还原峰峰电流与其浓度在1.8×10^-7-5.9×10^-6mol·L^-1范围内呈线性关系,检出限（3S/N）为1.0×10^-7mol·L^-1。对3.0×10^-6mol·L^-1咖啡酸甲酯溶液连续6次测定的相对标准偏差为2.4%。

Electrochemical behavior of methyl caffeate at glassy carbon electrode was studied by cyclic voltammetry.In an HOAc-NaOAc buffer solution of pH 4.8,a pair of oxidation and reduction peaks were observed at 0.342 V and 0.331 V（vs.SCE） respectively.The number of electronic transfer was found to be 2,and the number of protons takenpart in the reaction was also 2 in the electrochemical process of methyl caffeate.Linear relationship between values of reduction peak current and concentration of methyl caffeate was found in the range of 1.8×10^-7-5.9×10^-6mol·L^-1,and the detection limit（3S/N） was 1.0×10^-7mol·L^-1.Test for precision was performed with 3.0×10^-6mol·L^-1 methyl caffeate solution,and the value of RSD（n=6） found was 2.4%.