Plebopus portentosus sporocarp polysaccharide and extraction, separation and purification method thereof

The invention discloses a phlebopus portentosus sporocarp polysaccharide and an extraction, separation and purification method thereof. The phlebopus portentosus sporocarp polysaccharide is composed of mannose Man, glucose Glc, galactose Gal and L-fucose Fuc. The extraction, separation and purification method comprises the following steps: drying phlebopus portentosus sporocarp at low temperature, and then smashing the phlebopus portentosus sporocarp; preparing crude polysaccharide by adopting a water extraction and alcohol precipitation method, removing protein by adopting a Sevage reagent, removing pigment by adopting SP825 macroporous adsorption resin, separating and purifying by adopting DEAE-52 cellulose column chromatography, dialyzing by adopting a dialysis bag to remove inorganic salt and small molecular impurities, and further separating and purifying by using propylene sephadex S-400HR to prepare refined polysaccharide. The polysaccharide is prepared from the sporocarp of the phlebopus portentosus,