A method for extracting
water soluble beta-
glucan from
inonotus obliquus sporophore comprises the following steps: 1,
inonotus obliquus crude
polysaccharide preparation, to be more specific, taking
inonotus obliquus sporophore, crushing to obtain
powder, extracting the
powder with lye, filtering to remove a residue, adding
ethanol into filtrate, standing, filtering to obtain a precipitate to obtain inonotus obliquus crude
polysaccharide; 2, inonotus obliquus beta-
glucan preparation, to be more specific, taking the inonotus obliquus crude
polysaccharide,
drying, adding water, mixing, adding alpha-
amylase for
hydrolysis, filtering
hydrolysate, removing filtrate to obtain a residue to obtain inonotus obliquus beta-
glucan; and 3,
water soluble beta-glucan preparation, to be more specific, taking the inonotus obliquus beta-glucan, adding lye for stirring and extraction, adjusting pH of the extracting solution to 2.0-6.8, heating for
hydrolysis, filtering
hydrolysate, adding
ethanol into filtrate, standing, separating a precipitate and
drying to obtain the soluble beta-glucan. According to the method, the yield of inonotus obliquus polysaccharide is improved, water
solubility is increased, and the
water soluble beta-glucan is more conducive to body absorption.