极谱催化波法测定甘草酸

Determination of Glycyrrhizic Acid Based on Its Polarographic Catalytic Wave

作者发现在乙酸盐缓冲溶液中有H2O2存在时，甘草酸产生了极谱催化波。基于这一发现，拟定了测定甘草酸的新方法。在0．1mol／LNaAc－HAc（pH4．3）最佳废液中，甘草酸极谱催化波峰高与其浓度在8．0×10-7～1．0×10－5mol／L范围内有线性关系。本方法的灵敏度比相同介质无H2O2存在的方法高5倍。

A polarographic catalytic wave of glycyrrhizic acid (GA) is observed when H2O2 is present in acetate buffer solution. Based on this observation, a new method for the determination of GA is established. In 0.1 mol/L NaAc-HAc(pH 4. 3)-0.012 mol/L H2O2 support ing electrolyte solution, the peak height of the first derivative wave of GA is proportional to its concentration in the range of 8.0×10-7～1.0×10-5mol/L. The sensitivity is 5-fold high er in the presence of H2O2 than that without H2O2.