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

Abstract

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

YUAN Yong, ZHANG Su-Fang, SHUANG Shao-Min, DONG Chuan. Determination of Tea Polyphenols in Tea by 1.10-phenanthroline-iron(Ⅱ) Indicator[J]. FOOD SCIENCE, 2008, 29(3): 403-405.

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

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