食品科学 ›› 2008, Vol. 29 ›› Issue (2): 284-286.

• 分析检测 • 上一篇    下一篇

N2-苯浮选三元缔合物间接光度法测定食品中VC的研究

 陈敏, 闫永胜, 王言, 余龙, 李国芳   

  1. 江苏大学化学化工学院; 江苏大学化学化工学院 江苏镇江212013; 江苏镇江212013;
  • 出版日期:2008-02-15 发布日期:2011-08-24

Determination Study on VC in Food with Ternary Complexes by N2-benzene Floatation Indirect Spectrophotometry

 CHEN  Min, YAN  Yong-Sheng, WANG  Yan, YU  Long, LI  Guo-Fang   

  1. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
  • Online:2008-02-15 Published:2011-08-24

摘要: 依据I3-与孔雀绿易发生等离子对缔合反应生成三元配位缔合物,该缔合物具有在水中不稳定,而在苯等有机溶剂中稳定且极易溶于有机溶剂的特性,建立了N2-苯浮选三元缔合物间接光度法测定食品中VC的新方法。本法灵敏度高(ε=5.02×105L/mol·cm),精密度好(n=10,测定10μgVC,RSD%=3.4%),选择性强,测定了食品(蔬菜)中VC含量,结果令人满意。

关键词: 氮气, 苯, 浮选, 三元缔合物, 间接光度法, VC, 食品

Abstract: A new analytical method with nitrogen-benzene floatation ternary complex spectrophotometry for determination of VC was developed. Its principle is that I3-can react with malachite green to form ternary complex, which is insoluble and instable in water, but can be dissolved steadily in organic solvent. The method exhibits high sensitivity (ε= 5.02×105 L/mol·cm) and good selectivity and excellent accuracy (RSD=3.4 %, n=10, m=10μg). It can be used to determine of VC in food (vegetable) with satisfactoryr esult.

Key words: N2, benzene, floatation, ternary complex, indirect spectrophotometry, VC, food