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