食品科学 ›› 2008, Vol. 29 ›› Issue (3): 403-405.

• 分析检测 • 上一篇    下一篇

邻二氮菲亚铁指示剂法测定茶叶中茶多酚的含量

 袁勇, 张素芳, 双少敏, 董川   

  1. 山西大学化学化工学院; 大同大学化学化工学院; 山西大学化学化工学院 山西太原030006 山西省雁北教育学院; 山西大同037000; 山西大同037009; 山西太原030006;
  • 出版日期:2008-03-15 发布日期:2011-08-24

Determination of Tea Polyphenols in Tea by 1.10-phenanthroline-iron(Ⅱ) Indicator

 YUAN  Yong, ZHANG  Su-Fang, SHUANG  Shao-Min, DONG  Chuan   

  1. 1.School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China; 2.Shanxi Yanbei Educational College, Datong 037000, China; 3.School of Chemistry and Chemical Engineering, Datong University, Datong 037009, China
  • Online:2008-03-15 Published:2011-08-24

摘要: 本研究建立了以邻二氮菲亚铁为指示剂测定茶叶中茶多酚含量的定量分析方法。在硫酸强酸性介质中,以高锰酸钾为氧化剂、邻二氮菲亚铁为指示剂,用待测样品试液进行滴定,滴定终点颜色变化敏锐。该法的RSD在1.01%~1.40%(n=5),平均回收率在99.9%~101.1%,方法准确、简便,可用于茶叶中茶多酚含量的测定。

关键词: 邻二氮菲亚铁, 高锰酸钾, 茶多酚

Abstract: A new method for the determination of tea polyphenols (TP) by 1.10-phenanthroline-iron(Ⅱ) indicator is described in the study. The titration was accomplished with the sample solution as titrant and Potassium permanganate as the oxidizing agent in strong sulfuric acid medium. The end point of titration was determined with1.10-phenanthroline-iron(Ⅱ) indicator. The terminal color change of titration is sharp. The RSD of the method is 1.01%~1.40% (n=5)and the average recovery rate is 99.9%~101.1%.The proposed method was accurate and simple and has been successfully applied to the determination of tea polyphenols in tea.

Key words: 1.10-phenanthroline-iron(Ⅱ), potassium permanganate, tea polyphenols