Studies on the Extract Technology of Tea Polyphenolsfrom Green Tea by Orthogonal Test Method

The extraction of tea polyphenols was investigated with orthogonal test method. The results show that the optimum conditions for extracting tea polyphenols from green tea are as follows: (1) For productivity of tea polyphenols, extraction solvent is 95% alcohol solution, extraction time is 1.5 hours, extraction number with chloroform is 2 and extraction number with CH_3COOC_2H_5 is 1.(2) For content of tea polyphenols, extraction solvent is 95% alcohol solution,extraction time is 1.0 hours, extraction number with chloroform is 3 and extraction number with CH_3COOC_2H_5 is 3.The results has supplied with experimental basis for improving extiaction method of tea polyphenols.