Their characteristics such as the polysaccharide yield, polysaccharide content, protein content, infrared spectra were determined, and antioxidant
activities were investigated on the basis of hydroxyl radical, DPPH free radical, ABTS free radical and
reducing power. The results showed that five extracts exhibited antioxidant activities in a concentration dependent
manner. Compared with other methods, the compound enzymes extraction method was found
to present the highest polysaccharides yield (17.44%).