A purely neutral method for enzymatic degumming and unwinding of tussah silkworm cocoons

Abstract

The invention discloses a method for purely-neutral enzyme-degumming and reelability of tussah cocoons. The method comprises the following steps of 1, pre-treatment in a neutral environment: immersing tussah cocoon shells in clear water of which the weight is 10-50 times weight of the tussah cocoon shells for 12-24h, carrying out heating to a temperature of 90-100 DEG C, and carrying out heat preservation for 1-4h, and 2, enzyme treatment: carrying out cooling to a temperature of 45-60 DEG C, adding 2079 alkaline protease and / or trypsin, wherein the weight of the 2079 alkaline protease and / or trypsin is 5-20% of that of the tussah cocoon shells, and carrying out heat preservation until raw silk degum content is less than or equal to 3%. The method abandons the existing alkaline degumming technology or other chemical technologies, does not use any chemical reagents, does not produce alkaline waste water, improves an alkaline biological enzyme method, and realizes thorough neutral degumming. The sericin hydrolysate obtained by the method can be recovered and used for foods, health products, cosmetics, forage or organic fertilizer. The method realizes zero discharge and is a purely-neutral, green and environmentally-friendly production technology.

Description

technical field [0001] The invention relates to a pure neutral enzymatic degumming and unwinding method of tussah silkworm cocoons, belonging to the fields of enzyme engineering and textile engineering. Background technique [0002] Tussah shells are mainly composed of sericin and silk fibroin, and silk fibroin is used in silk production. The first step in silk production is to remove sericin. The traditional degumming of tussah silkworm cocoons mostly adopts the soap-alkali method, which uses chemical reagents such as sodium carbonate and sodium silicate to promote the swelling and hydrolysis of sericin protein through high pH, ​​so as to realize the removal of sericin. This method has the following disadvantages: 1. Uneven degumming, rough raw silk and poor luster; 2. A large amount of alkaline sewage is produced, which seriously pollutes the environment; 3. The sericin protein hydrolyzate cannot be recycled because it is mixed with various chemical reagents. [0003] Th...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: 1. Uneven degumming, rough raw silk and poor luster; 2. A large amount of alkaline sewage is produced, which seriously pollutes the environment; 3. Sericin protein hydrolyzate cannot be recycled because it is mixed with various chemical reagents

[0007] To sum up, the method of degumming and relaxing tussah silkworm cocoons in the prior art is generally understood by those skilled in the art to be carried out in an alkaline environment, so the problem that arises——environmental pollution