Study on extraction process of the tea polyphenols

Using ethanol 80% as a solvent and extracting the tea polyphenols from the tea by ultrasonic wave auxiliary method was studied in this paper.Comparing the advantages and disadvantages of the traditional organic solvent extraction,Soxhlet extraction,ultrasonic extraction of three kinds of process was also studied too.Obtained by single factor and orthogonal tests,Under the same conditions in organic solvents,ultrasonic extraction rate and the highest content of polyphenols,the ultrasonic extraction have the many advantages,for example the time-saving,the high efficiency,the low cost,the easy to operate,the improving product quality etc.The optimum conditions of ultrasonic method for extracting tea polyphenols from leaf of Indocalamus were as follow:the mass percentage of alcohol 80%,ultrasonic power 260 W,extracting time 25 min.expects the fluid to compare 1:8,the number of extraction 2 times.Ultrasonic power and ultrasonic time are small influence and play a supporting role.