碳纳米管修饰电极对阿魏酸的电化学分析测试研究

摘要

研究了阿魏酸在碳纳米管修饰玻碳电极上的电化学行为,优化了测定参数,建立了一种测定阿魏酸的电化学分析测试方法。阿魏酸在碳纳米管修饰玻碳电极上于醋酸盐缓冲溶液中在-0.2~0.8 V处产生一对氧化还原峰,氧化峰电流与阿魏酸的浓度在1×10-5~1×10-3 mol/L 之间有良好的线性关系,线性回归方程为： Ip=8.7788+0.8561C,相关系数R为0.9995,检出限为1×0-6 mol/L,适用于中成药及中药材中阿魏酸含量的测定。%The electrochemical behaviors of ferulic acid were investigated at the glassy carbon electrode modified with multi-walled carbon nanotube. In HAc-NaAc buffer solution, ferulic acid exhibited a pair of stable and sensitive redox signals at the modified electrode. The reaction mechanism was explored. Through the cyclic voltammetry, trace amount of ferulic acid was detected quantitatively. In the range of 1í10-5 to 5í10-3 mol·L-1 , the oxidation peak currents of ferulic acid had a linear relationship to the concentrations, the limit of detection was estimated to be 1í10-6 mol·L-1 ( S/N=3 ) . The method could be used to detect the trace amount of ferulic acid in medicament.