聚苏氨酸修饰铅芯电极同时测定尿酸、黄嘌呤和次黄嘌呤

Poly (threonine) Modified Pencil Electrodes for the Simultaneous Determinations of Uric Acid, Xanthine and Hypoxanthine

制备一种简单、低成本的聚合膜修饰电极,用于黄嘌呤(XA)、次黄嘌呤(HX)和尿酸(UA)的同时测定。单线扫描伏安法。在聚苏氨酸修饰铅芯电极上,XA,HX和UA的电化学氧化信号均得到显著增强,氧化过电位不同程度降低。同时在UA、XA和HX共存时,PT/PGE可以选择性、无干扰的测定每一种嘌呤,且其氧化峰电流与XA、HX和UA的浓度在一定范围内均呈良好线性关系。该电极对UA、XA和HX的电化学检测具有优异的电催化特性,可用于实际样品中XA、HX和UA的同时测定。

A simple and low-cost polymer film modified electrode was prepared for simultaneous determination of xanthine(XA), hypoxanthine (HX) and uric acid (UA). The linear sweep voltammeter method.The oxidation peak current for UA, XA and HX on PT/PGEwere increased significantlyand the oxidation overpotential was decreased with different degrees. At the same time, when UA, XA and HX coexist, PT/PGE can selectively determine each purine without interference, oxidation peak current were linearly related to the concentrations of UA, XA and HX. PT/PGE displays superior electro catalytic activity toward the electrochemical oxidations of UA, XA and HX. Poly (threonine) modified pencil electrodes could be used for the simultaneous determination of UA, XA and HX in practical samples.