The invention relates to a method for extracting dietary fibers, in particular to a method for extracting dietary fibers from
suaeda salsa. The method comprises the following steps: S1, collecting
suaeda salsa residues, cleaning the collected
suaeda salsa residues,
drying the cleaned suaeda salsa residues, crushing the dried suaeda salsa residues, and screening the crushed suaeda salsa residues so as to obtain suaeda salsa reside
powder; S2, weighing the suaeda salsa residue
powder, adding
sterile water, and performing flash extraction so as to obtain a
solid-liquid mixture; S3, adjusting the pH value of the
solid-liquid mixture, inoculating mixed microorganisms bacterial liquor a, and performing culturing so as to obtain
fermentation liquor; S4, taking the
fermentation liquor, adjusting the pH value of the taken
fermentation liquor, inoculating mixed microorganisms bacterial liquor b, performing culturing, performing sterilization, performing cooling to obtain cooled fermentation liquor, and performing
centrifugal separation so as to obtain upper-layer clear liquor and lower-layer
precipitation; S5, taking the upper-layer clear liquor, adding
anhydrous ethanol, performing standing, performing
centrifugation, performing
precipitation, and performing
drying so as to obtain suaeda salsa soluble dietary fibers; and S6, taking the lower-layer
precipitation, and
drying the taken lower-layer precipitation so as to obtain suaeda salsa insoluble dietary fibers. According to the method disclosed by the invention, the dietary fibers are extracted by a fermentation method,
reaction conditions are mild, the method is safe and efficient, the extraction rate of the dietary fibers is increased, the purity of the dietary fibers is improved, and the water-holding capacity and the swelling force of the dietary fibers are improved.