Technology of extracting soybean protein isolate

Abstract

A process for extracting soybean protein includes such steps as grinding with water, lixiviation, acidity settlement, separation, press filter, special dispensing and airflow drying. Its advantages are low cost, and high productivity, quality and viscosity of product.

Description

(1) Technical field [0001] The invention relates to the field of soybean deep processing, in particular to a method for extracting soybean protein isolate. (2) Technical background [0002] Soybean is one of the crops with higher protein content. The isolated protein extracted from soybean is rich in eight essential amino acids such as lysine, tryptophan, valine and other amino acids. It is a good basic raw material for a variety of food processing. At present, the conventional process of "dry crushing, heating extraction, centrifugal separation, and spray drying" is generally used in the production of soybean protein isolate at home and abroad. The main content of this process and its shortcomings are as follows: [0003] 1. Dry pulverization and extraction: The conventional process is to directly pulverize the soybean meal, and then add water, heat and alkali for extraction. There are following deficiencies in this way: [0004] (1) Since the crushed soybean meal is a d...

AI Technical Summary

Problems solved by technology

[0004] (1) Since the crushed soybean meal is a dry powder, it needs a water absorption and swelling process. In order to promote its water absorption and dissolution, the extraction water must be heated to about 60°C, which consumes a lot of energy

[0005] (2) The leaching time of each batch still needs 2 to 4 hours, and the leaching containers required for continuous operation must be many, which increases the investment in equipment

[0006] (3) Soybean meal powder will inevitably start to oxidize after contacting with the solvent, and the conventional process usually has no preventive measures, which will directly affect the quality of the product

[0007] (4) The produced product has poor viscosity and insufficient protein dissolution

[0014] In CN1282525A, an invention patent titled "a process for extracting soybean protein isolate" is disclosed. Although it can increase the output of products, it has not been substantially improved in terms of equipment investment and production energy consumption, and the production cost is still high