Process for preparing white cross-linked protein powder from silkworm pupa

Abstract

A process for preparing non-odour white silkworm pupa protein from the degreased silkworm pupa powder includes dissolving saponizing, separation, regulating isopotential point, separating, washing, deodouring and cross-linking. Its advantages are high extracting rate, and high quality of product.

Description

1. Technical field [0001] The invention belongs to the technical field of silkworm chrysalis protein manufacturing technology. 2. Technical Background [0002] Silkworm chrysalis is one of the main by-products of the silk reeling industry. Silkworm chrysalis is rich in protein with high nutritional value. Silkworm chrysalis protein is widely used in food industry and animal feed. . For example, the process for extracting silkworm chrysalis disclosed in "a spinning solution containing silkworm chrysalis protein" in the patent No. ZL 95111330.5 is to dry, degrease, soak, and dissolve fresh silkworm chrysalis in an alkaline solution. Finally, it is filtered, molecular sieve is used to control the molecular weight, and then decolorized to adjust the isoelectric point, washed with water, and finally dehydrated and dried to obtain silkworm chrysalis protein. This manufacturing process has the following disadvantages: [0003] 1. Extract protein from the complete silkworm chrysa...

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Problems solved by technology

[0005] 3. Due to the drying method used in this process, the dried product is in the form of lumps, and after being crushed, it becomes black particles, which need to be soaked and softened for a long time to dissolve, and the silk made of this protein is yellowish brown, which cannot be used for light colors. fabric;

[0006] 4. Since this manufacturing process has no separation and removal of residual fat except for the degreasing of silkworm chrysalis, this process is only suitable for dried silkworm chrysalis with a very low fat content (≤1%), not for those with a fat content higher than 3%. Silkworm chrysalis (the fat content of commercially available defatted silkworm chrysalis ≥ 3%)

If this process is used to process the commercially available defatted silkworm chrysalis and the silkworm chrysalis protein is used for spinning, it is easy to block the filter cloth when filtering, and it is easy to block the silk holes when spinning; when it is used in the food industry and animal feed, it is easy to become rancid and produce unpleasant smell. Odor, affecting food quality and appetite

In fact, when the fat content of dried silkworm chrysalis drops to about 3%, reducing its fat content will consume a large amount of solvent oil, and the efficiency is extremely low, which is very uneconomical