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Citation: Ge Yizhang, Jin Hong. Extraction of Tea-Polyphenols by Precipitation Method[J]. Chinese Journal of Applied Chemistry, ;1995, 12(2): 107-109. shu

Extraction of Tea-Polyphenols by Precipitation Method

Ge Yizhang ,
Jin Hong

Hefei Research Institute, Central Coal Mining Research Institute, Hefei 230001

Received Date: 3 July 1994
Revised Date: 2 November 1994

The conditions of extraction of tea-polyphenols (TP) from tea dusts by precipita-tion method using metal ions Ca²⁺,Mg²⁺,Ba²⁺,Fe³⁺,Zn²⁺ and Al³⁺ as precipitating agents have been investigated. The influences of pH value,temperture,time,type and content of basic solutions used to regulate the pH value on the extraction rate of TP were examined. It is shown that the extraction rate of TP could reach 10.5% and the content of the effective in-gredients of TP could reach 99.5% by the proposed method.
- tea-polyphenol,
- metal ion,
- extraction,
- precipitation method
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