Efficient methods for deproteinizing and decolorizing polysaccharides demonstrated.
Polyamide chromatography is the most efficient deproteinization method.
Resin S-8 is the most efficient decolorization method.
Salt-eluted polysaccharide has more significant immunostimulatory effects.
Polysaccharide fraction SPS-3 showed the most immunostimulatory activity.