Method of preparing protein powder through solid-phase fermentation by mixing salmon fat line and soybean meal

Abstract

The invention relates to a method of preparing protein powder through solid-phase fermentation by mixing salmon fat line and soybean meal, wherein the method includes following processes: (1) uniformly mixing the soybean meal and minced salmon fat line surimi with a nutrient supply solution according to the ratio of 1:0.5-2.5 and regulating the initial pH value to 7.0-8.0; (2) performing high-temperature solid-phase fermentation to the mixture at 40-57 DEG C for 4-15 days; (3) performing water-extraction, wherein the ratio of the mixture to water is 1:10-25 and the extraction time is 0.5-2 h; (4) performing filtration to separate insoluble substances and clear liquid after the extraction is finished; and (5) concentrating and spray-drying a filtrate to obtain the protein powder. The protein powder is prepared from the soybean meal obtained through microorganism fermentation and the salmon fat line, so that the method is complete in degradation, is free of pollution and is low in production cost. The prepared protein powder is a yellow powder which can be re-dissolved completely, has both a soybean fragrance and a fresh taste of fish and is almost free of fishy taste.

Description

technical field [0001] The invention relates to a fermentation method for preparing protein powder, in particular to a method for preparing protein powder by solid-state fermentation of salmon fat line and soybean meal. Background technique [0002] In recent years, the sales of salmon sashimi have been rising steadily, and with it, the treatment of its processing by-product—fat line has become an urgent problem to be solved. The fat line refers to the part of the fish located on the side of the salmon body. The mass accounts for about 5% of the total mass of the fish body. Salmon fat line has a high protein content (about 65%) and is rich in essential amino acids needed by the human body. It is a good raw material for fermentation to prepare protein powder. But now the fat thread is only directly crushed and dried to make feed fish meal, which fails to realize effective resource utilization. [0003] Soybean meal is the product of soybean oil extracted from soybean, which...

AI Technical Summary

Problems solved by technology

Among them, the essential amino acid composition and structure of soybean protein are very suitable for the needs of the human body, but most of the proteins contained in it are water-insoluble macromolecular proteins, and as plant proteins, it is difficult to be degraded and absorbed by the human body.