多壁碳纳米管修饰铅笔芯电极测定五倍子中单宁酸

Determination of Tannic Acid in Chinese Gall by the MWCNT-Modified Pencil Graphite Electrode

以功能化多壁碳纳米管修饰铅笔芯电极,B-R缓冲溶液为支持电解质,建立了示差脉冲伏安法测定单宁酸(TA)的新方法.TA浓度在0.05~8.00μmol/L范围内,与其峰电流具有良好的线性关系,检测限为0.02μmol/L.该方法具有价格便宜、制备简单、灵敏度高、稳定性好和抗干扰能力强等优点,并成功应用于五倍子中TA浓度的测定.

A sensor for determining tannic acid(TA)was developed,based on functionalized multiwall carbon nanotubes(MWCNTs)onto the pencil graphite electrode(PGE)and using differential pulse voltammetry(DPV)in B-R buffer solution.With a linear range of 0.05~8.00μmol/L for TA concentration,the lowest detection limit was 0.02μmol/L.The method has the advantages of low price,simple preparation,high sensitivity,good stability and strong anti-interference ability,and has been applied to the determination of TA in Chinese gall with satisfactory results.