纳米氧化锌修饰的涂丝型γ-氨基丁酸选择电极的研制与应用

Preparation and application of coated wire polyvinyl chloride membrane γ-aminobutyric acid selective electrode modified with ZnO nanoparticles

制备了一种以纳米材料氧化锌（ ZnO）为修饰剂的涂丝型γ-氨基丁酸选择电极,对其各项性能进行考察,并与普通涂丝型γ-氨基丁酸选择电极进行比较。该ZnO修饰电极的Nernst响应范围为8．9×10-7～1．0×10-1 mol·L-1,极差电位为61mV/pC,检测限为6．2×10-7mol·L-1。与普通电极相比,此修饰电极的各项性能都显示出更佳的效果,检测下限更低,检测范围更广,响应时间更短,并能够更加快速、准确的检测发芽糙米中γ-氨基丁酸的含量,并且与分光光度法测得的结果相符。

A new coated wire polyvinyl chloride membrane-γ-aminobutyric acid selective electrode modified with ZnO nanoparticles was prepared,and compared with ordinary coated wire polyvinyl chloride membrane-γ-aminobutyric acid selective electrode in per-formance. The ZnO nanoparticles modified electrode showed Nernst response toγ-aminobutyric acid in the range of 8. 9＆#215;10-7-1. 0＆#215; 10-1mol＆#183;L-1 with a slope of 61 mV/pC. The detection limit was 6. 2＆#215;10-7mol＆#183;L-1. By comparison to the ordinary electrode,the modified electrode showed a better performance,it had a lower detected limit,wider detected range and a shorter response time. The ZnO nanoparticles modified electrodes can be used to determine the concentration of γ-aminobutyric acid in the brown rice more rapidly and accurately,and the reseults obtained agree with those of spectrophotometer determination.