Process engineering for extracting fishes processing offal fish oil by enzymolysis process

Abstract

A process technology using enzymolysis method to extract leftover fish oil from fish processing comprises the following steps: preliminary treatment, in which the leftovers from the fish processing are cleaned and minced; protease hydrolysis, in which neutral protease and papain are hydrolyzed simultaneously; oil-water separation, in which hydrolysate is centrifugally filtered to remove residues, and filtrate undergoes oil-water separation via a centrifuge, thereby obtaining the fish oil and hydrolyzed protein; and fish oil refinement, in which refined fish oil can be obtained after the fish oil is degummed, depickled, decolored and deodorized. The leftovers from the fish processing can be hydrolyzed with the proteases to destroy the associative relation of protein and fat, thereby releasing axunge which undergoes oil-water separation by the tubular centrifuge to obtain the fish oil with high quality, and meanwhile, the protein therein can be fully utilized to produce hydrolyzed protein, so as to change wastes into valuables and synthetically and efficiently utilize the resources of the fish and the processing leftovers.

Description

technical field [0001] The invention relates to the field of biotechnology application and comprehensive utilization of fish resources, in particular to a technology for extracting fish oil from fish processing waste by enzymatic hydrolysis. Background technique [0002] In the process of fish processing, especially fish fillet processing, a large amount of leftovers will be produced. Tuna, known as "ocean gold", is mainly processed as sashimi and canned fish. The leftovers produced by processing account for about 10% of the total weight 50% to 70% of tilapia; my country is a big tilapia breeding country, accounting for 69% of the world's tilapia production in 2005. Frozen tilapia fillets are the main products of tilapia exported from my country, and every 1 ton of tilapia fillets processed , About 2 tons of leftovers will be produced. The leftovers of fish processing include fish heads, viscera, fish rafts, gills, etc. These leftovers contain a large amount of protein, fat a...

AI Technical Summary

Problems solved by technology

Due to the fact that the quality of domestically produced fish oil cannot meet the demand for raw materials for health care products and the large decline in the resources of the main raw material of domestically produced fish oil, the import of fish oil has increased significantly in recent years.