Abstract:

Abstrct The ultrosonic extraction method was used to study the extraction technique of the polysaccharide from Oolong tea and its hpyerglycemic activity. A single-factor experiment with L9（34）orthogonal test was carried out to analyse the influence of solid-liquid ratio, ultrosonic time, ultrosonic power and ultrosonic temperature on the hpyerglycemic activity of tea polysaccharides. The results showed that the four factors had significant effects on the hpyerglycemic activity of tea polyccharides. the optimal extraction conditions were as follows: solid-liquid ratio 1∶40, ultrosonic power 160 W, ultrosonic time 40min and ultrosonic temperature 65℃. Under these conditions, the hpyerglycemic activity of tea polyccharides was up to 26.18%.