电化学分析法测定中药中虎杖苷

Electrochemical detection of polydatin in traditional chinese medicine

建立了虎杖苷在碳纳米管修饰玻碳(CNT/GC)电极上的电化学检测方法。在0.2 mol/L HCl溶液中,用方波溶出伏安法研究了虎杖苷在CNT/GC电极上的电化学行为。虎杖苷在+0.83V(vs.Ag/AgCl)电位处产生一个阳极氧化峰,峰电流与虎杖苷的浓度在7.0×10-7～4.0×10-5mol/L范围内呈良好的线性关系,最低检测限达4.57×10-7mol/L。方法可用于生药材和中成药中虎杖苷的测定。

A simple, quick and sensitive method for THE detection of polydatin on a carbon nanotube modified glassy carbon （CNT/GC） electrode by square wave stripping voltammetry was developed. The electrochemical oxidation of polydatin on a CNT/GC electrode was investigated. In 0. 2 mol/L HC1, one well-defined oxidation peak of polydatin was obtained, and the peak potential was ＋ 0. 83V （vs. Ag/AgC1）. The peak current was proportional to the concentration of polydatin over the range of 7.0 ×10 -7 - 4.0 × 10 -5 mol/L by square wave stripping voltammetry. The detection limit was 4. 57 × 10-7mol/L. Thus, a quantitative analysis of polydatin in two real samples was established based on the electrochemical behavior of polydatin. The method was applied to the determination of polydatin in Chinese herb and medicine.