Method for extracting useful substances from shrimp shells

Abstract

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.

Dependencies are inferred from the claim text.