MurrillPolysaccharides were extracted with hot water (1: 30 ratio ofraw material to water, w/v) for 3 h at 95◦C. The extract was filtered and the filtrate was condensed in a rotary evaporator underreduced pressure at 60◦C, and was then precipitated by adding ethanol (12 h, 4◦C) to a final concentration of 80% (v/v). The precipitates were collected by centrifugation (4200 rpm, 15 min) and washed three times by dehydrated alcohol. Then the precipitates were lyophilized to obtain crude polysaccharides.