Disclosed is a method for extracting useful substances from
shrimp shells. The method comprises: crushing the
shrimp shells, mixing the crushed
shrimp shells and water, then heating same to 28° C.-35° C., adjusting the pH value to 6.8-7.5, preferably 6.8-7, then adding an
alkaline protease and mixing same, heating same to 42° C.-48° C., performing constant-temperature enzymolysis for 50-70 min, and performing sieving to obtain an enzymatic
hydrolysate and
solid residues; performing
centrifugal separation treatment on the enzymatic
hydrolysate to obtain a shrimp
protein deposit containing
astaxanthin; mixing the shrimp
protein deposit and water, performing heating while stirring, adjusting the pH value to 6.8-7.0, performing heating to 58° C.-60° C., adding
vegetable oil, and performing emulsification for 50-70 min under stirring to obtain an
emulsion; and performing
centrifugation on the
emulsion, and performing
delamination to obtain
astaxanthin-containing oil in an upper layer, water in a middle layer, and a shrimp
protein in a lower layer. The method of the present invention uses waste
biomass obtained after shrimps processed as a
raw material, and can simultaneously extract several high-value substances, thereby not only improving the
utilization rate of the
raw material, but also shortening the
production cycle; and no
organic solvent is added, such that the method is clean, green and
environmentally friendly.