食品科学 ›› 2006, Vol. 27 ›› Issue (12): 601-603.

• 分析检测 • 上一篇    下一篇

基于多金属氧酸盐电化学传感器对水果中抗坏血酸的测定

 王力, 王芳, 蔡慧农, 吴永沛, 黄志勇   

  1. 集美大学生物工程学院; 泉州师范学院化学与生命科学学院;
  • 出版日期:2006-12-15 发布日期:2011-11-23

Detemination of Ascorbic Acid in Fruits by Electrochemistry Senser of Polyoxometalate Modified Electrode Based on Polyoxomolybdate

 WANG  Li, WANG  Fang, CAI  Hui-Nong, WU  Yong-Pei, HUANG  Zhi-Yong   

  1. 1.School of Bioengineering, Jimei University, Xiamen 361021, China; 2.Chemistry and Life Science School, Quanzhou Teachers College, Quanzhou 362000, China
  • Online:2006-12-15 Published:2011-11-23

摘要: 用循环伏安法研究了多金属氧酸盐V18修饰电极的电化学行为,研究结果表明在多金属氧酸盐V18-聚丙烯酸碳酸酯膜中V4+/V5+的氧化还原过程发生的同时对抗坏血酸的氧化具有催化作用。用恒电位安培法考察了测定抗坏血酸的最佳条件:工作电位为+0.5V(Vs.SCE);支持电解质为缓冲溶液(pH4.5);线性范围是:4×10-8~1×10-4mol/L,最低检测下限为1.5×10-8mol/L(信噪比为3)。该方法不仅适用于分析无色样品,而且也适用于分析有颜色的、粘稠的和浑浊的水果、蔬菜及生物样品,并且无需对样品做繁琐的前处理。把该电极应用于水果样品的分析,回收率为96.9%~102.1%,获得令人满意的结果。

关键词: 多金属氧酸盐, 电化学性能, 修饰电极

Abstract: The electrochemical behavior of polyoxometalate modified electrode is studied by cyclic voltammetry. The results show that :optimal conditions are obtained and the mechanism of catalytic oxidization is inferred. 4×10-8 ~1×10-4mol/Lof the linear range, 1.5×10-8 of the detection limit and 96.9%~102.1% of recovery for ascorbic acid are obtained in the optimal conditions. The proposed method is simplicity, rapidity, sensitivity, and high selectivity, and offer great practical interest for the periodic control of ascorbic acid in fruits and vegetables.

Key words: polyoxometalate, electrochemical behavior, modified electrode