武夷岩茶中茶多酚的提取及工艺研究

A Research on Extraction of Tea-Polyphenls in Wuyi Rock Tea and Its Technology

用离子沉淀、微波＋离子沉淀、有机溶剂直接苹取三种方法提取武夷岩茶中茶多酚，提取率分别是4．41±0．43％、6．53±1．37％、5．83±0.08％。沉淀法提取的粗品纯度为21．12％（水溶解）和14.54％（乙酸乙酯溶解）；有机溶剂直接萃取的粗品纯度为69．88％（水溶解）和83．88％（乙酸乙酯溶解）。茶多酚粗品红外光谱分析的结果为单宁酸；紫外光谱分析的结果吸收峰在270～273．5nm之间。

The paper shows that three methods can be used in exrrction of tea- polyphenols in Wuyi rock tea by ion precipitation seperation, microwave ± ion precipitation seperation and direct extrcfion with organic solvent. The extrction rate is respectively 4.41 ± 0.43 %, 6.53 ± 1.37 %, 5.83 ± 0. 08 %. The purity of rough product by precipitation seperation is 21.12 % （ in distilled water ） and 14.54 % （ in ethyl acetate ）, and the purity of rough product by direct extretion with organic solvent is 69.88 % （ in distilled water ） and 83.88 % （ in ethyl acetate）. The infrared spectnan analysis on rough tea - polyphenols is tannic acid, and the maximum of absorb is between 270- 273.5nm by ultraviolet spectrum analysis on it.