碱性品红／纳米金／聚碱性品红修饰电极的制备及其对抗坏血酸的催化氧化  

A Novel Modified Electrode Based on Poly(fuchsin basic)/Nano-Au/Fuchsin Basics and Its Application to Ascorbic Acid

作　　者：王晋芬[1] 袁若[2] 柴雅琴[1] 曹淑瑞[1] 殷冰[1] 

机构地区：[1]西南大学化学化工学院,重庆400715 [2]重庆市现代分析重点实验室,重庆400715

出　　处：《西南大学学报（自然科学版）》2008年第3期42-46,共5页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20675064);重庆市自然科学基金资助项目(CSTC-2004BB4149,2005BB4100);西南师范大学博士基金资助项目(SWNUB2004021);西南大学高新技术培育基金资助项目(XSGX02)

摘　　要：采用电聚合法将带正电的碱性品红（FB）电聚合到玻碳电极（GCE）表面，利用静电吸附作用吸附带负电的纳米金，然后再吸附带正电的碱性品红，从而制备了FB／nano-Au／pFB修饰电极,用循环伏安法和计时电流法考察该修饰电极的电化学特性，发现该修饰电极对抗坏血酸（AA）的氧化有良好的电催化作用。结果表明：室温下，在0.10mol／LpH为7.0的PBS缓冲溶液中，该修饰电极有一良好的氧化还原峰，用其测定AA的线性范围为6.44×10^-7—1.31×10^-3mol／L，检测限为4.30×10^-7mol／L，并具有选择性高，线性范围宽，响应快等优点。In this study, a new approach to mensurate ascorbic acid （AA） was developed by means of elec- tropolymerizing fuchsin basic on a glassy carbon electrode （GCE）. At first, the glassy carbon electrode was modified with nano-Au by chemical adsorption, and then fuchsin basic was adsorbed on the nano-Au surface. The electrochemical characteristics of the stable electrode based on nano-Au/fuchsin basics/poly （fuchsin basic） were studied extensively in 0.10 mol/L phosphate buffer （pH=7.0）. The electrode exhib- ited high sensitivity, fast response, and linear in the range of 6.44×10^-7-1.31×10^-3mol/L, with a cal- culated limit of 4.30×10^-7mol/L.

关 键 词：碱性品红 纳米金 修饰电极 抗坏血酸 

分 类 号：O657.1[理学—分析化学]