Study on the technology of tea polysaccharide extracting from Xinyang red tea by enzymatic method

To improve the extraction rate of tea polysaccharide, the technology of tea polysaccharide extracting from Xinyang red tea by enzymatic method was studied.The effect of hydrolysis temperature, hydrolysis time, dosage, pH and other factors of compound enzyme (the ratio of cellulase and pectinase was 1:1) on the extraction rate of tea polysaccharide were discussed and the enzymatic extraction process was optimized.Results showed that hydrolysis temperature, hydrolysis time, dosage, pH of compound enzyme had a significant impact on the extraction rate of tea polysaccharide and the optimum parameters for the tea leaves were given as follows:the dosage of compound enzyme was about 0.5%, the pH was about 5.5, the hydrolysis temperature was about 40℃ and the hydrolysis time was about 3h.The extraction rate of tea polysaccharide in best conditions was 3.69% and that was 1.92 times that of water extraction.