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Citation: LONG Chun-Mei, LI Jing-Jing, JIANG Wen-Wei. Complex Agent Recycle and Effect of Iron(Ⅲ) on Tea Polyphenols Yield in Complexing Precipitation Process[J]. Chinese Journal of Applied Chemistry, ;2005, 22(12): 1387-1389. shu

Complex Agent Recycle and Effect of Iron(Ⅲ) on Tea Polyphenols Yield in Complexing Precipitation Process

1.
College of Chemical Engineering, Sichuan University, Chengdu 610065

Corresponding author: JIANG Wen-Wei,
Received Date: 26 December 2004
Available Online: 18 July 2005

Tea polyphenols(TP) were prepared by a complexing precipitation processs with an aluminium salt as the complexing agent.This study mainly focuses on the recycle of the complex agent,and the effect of Fe³⁺ content on the product yield was investigated.At 30~50℃ and pH 5~6,the TP in 200 g of green tea formed complex with 65 g of hydrous aluminium chloride.The precipitate obtained was washed with deionized water thoroughly,acidified with 10% hydrochloric acid, and then extracted with an equivalent volume of ethyl acetate.The ethyl acetate solution of TP was concentrated to produce crude TP with a yield of up to 11.94% and a purity of 90%.The experimental data also show great reduction in TP yield when Fe(Ⅲ) was involved in the precipitation process of the aluminium salt.In the absence of ferric iron,the aluminium complex agent can be recycled at least 3 times with TP yields of more than 10% and the purity higher than 88%.
- tea polyphenols,
- complexing precipitation process,
- recycle of complex agent
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