Separation extraction method for chitin

Abstract

The invention relates to a separation extraction method for processing and generating protein hydrolysate and chitin by taking crustacean wastes. The method comprises: drying shrimp shells or crab shells, crushing into 40-80 mesh, putting in an enzyme digestion pot, adding water, stirring, standing at normal temperature for swelling; heating the enzyme digestion pot to 51-55 DEG C, adding mixed enzyme accounting for 0.6% by weight of the shrimp shell adding amount, adjusting the pH value to 6.5-7.5, stirring, performing enzyme digestion and pressure filtering to obtain an enzyme fine filtrate and clean shrimp shell powder; performing centrifugation separation on the fine filtrate, performing decoloring and secondary fine filtration on the lower-layer residual liquid, desalting, and performing vacuum concentration and spraying drying to obtain the protein hydrolysate product; and adding a hydrochloric acid solution into clean shrimp shell power, immersing and performing decalcification, adding sodium hydroxide to neutral, and performing filtration, clean and drying to obtain chitin. According to the method, the technological route is reasonable, the technology is easily controllable, the production efficiency is high, the product quality is good, and the method is suitable for industrialized production, and the environmental pollution is small and the cost is low.

Description

Technical field: [0001] The invention belongs to the technical field of separation and extraction of natural products, and relates to a process for producing hydrolyzed protein and chitin using crustacean processing waste as raw materials, in particular to a clean extraction process for chitin. Background technique: [0002] As we all know, aquatic animal protein has high nutritional value. A large number of animal experiments have shown that: aquatic animal protein has obvious immune regulation, anti-fatigue, anti-radiation, liver protection, etc., and the hydrolyzed protein produced by biological methods is easier to be absorbed and utilized by the human body, and has good water solubility and water retention. It is widely used in food, medicine and other industries, and has high economic value. Our country is rich in crustacean resources, and the amount of breeding and processing of crustaceans is huge. At the same time, there is a large amount of processing waste. The w...

AI Technical Summary

Problems solved by technology

[0003] At present, the utilization of crustacean processing wastes has the following problems: backward processing technology, single product (only chitin), high cost, resulting in waste of resources, and a large number of strong acids and alkalis have caused serious pollution, resulting in high concentration, high Salinity organic wastewater whose polluting components include large amounts of CaCl 2 , NaCl and other salts, a large amount of animal protein (shrimp, crab shell protein) and its degradation products, shrimp (crab) shell pigment, oil, impurities brought by the raw material itself, a small amount of chitin and chitosan, etc.

Untreated water is black, smelly, and eutrophic, causing serious pollution to aquaculture and water environment, and can even induce red tides

At present, in the treatment of chitin production sewage, a simple terminal treatment method is adopted, which requires a large one-time investment, high operating costs, and it is difficult to achieve discharge standards

There are hundreds of chitin processing industries in my country's coastal areas. Due to the limited consumption of chitin in China, a large number of products still rely on exports to make profits. However, the disorderly competition of a large number of manufacturers makes the chitin industry profitable, and some are in trouble.