The invention relates to an extraction method of
chondroitin, particularly to an extraction process of shark
chondroitin, and belongs to the technical field of
natural product extraction. According to the extraction process, an enzymic method, membrane separation and
carbon dioxide supercritical extraction are integrated. The extraction process comprises the steps as follows: taking fresh
shark cartilage, washing the
shark cartilage clean, crushing the
shark cartilage into
fine powder, and extracting the
fine powder in a NaOH solution to obtain an extract liquid; adjusting the pH of the extract liquid, and then adding
trypsin for enzymolysis to obtain enzymatic
hydrolysate; performing
enzyme deactivation on the enzymatic
hydrolysate, filtering the enzymatic
hydrolysate with an ultra-
filtration membrane to obtain an ultra-
filtration permeate, and filtering the permeate with a
nanofiltration membrane to obtain a concentrated solution; and spray-
drying the concentrated solution into
powder, feeding the
powder into an extraction kettle for
carbon dioxide supercritical extraction to obtain
chondroitin solids. An integrated extraction process of the shark chondroitin is adopted, and the extraction process has the characteristics of high yield and high product purity.