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Silk antibacterial finishing method based on enzyme-catalyzed conversion and grafting

An antibacterial finishing and silk technology, applied in enzyme/microbial biochemical treatment, biochemical fiber treatment, fiber treatment, etc., can solve the problems of finishing waste liquid discharge to pollute the environment, release and migrate to the surface of the body skin, and silk fibers are not firmly bonded, etc. , to achieve the effect of mild treatment conditions, good antibacterial performance and high antibacterial performance

Active Publication Date: 2019-01-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While these finishing agents endow the silk with a certain antibacterial effect, some of them are not firmly bonded to the silk fiber, are easily released from the surface of the fiber and migrate to the surface of the skin, or the strength of the silk is damaged during baking, and the fiber turns yellow. Disadvantages such as liquid discharge polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Gram weight is 70g / m after removing sericin with the method mentioned in the present invention 2 Antibacterial finishing of silk fabrics;

[0025] (1) Enzymatic conversion of amino acids in silk: silk is treated with serine hydroxymethyltransferase;

[0026] Treatment process prescription and conditions: Serine hydroxymethyltransferase 2.5U / mL, pyridoxal 5-phosphate 0.25mmol / L, tetrahydrofolate 2mmol / L, formaldehyde 5mmol / L, pH 7.5, temperature 30°C, treatment time 2 hours; after the treatment, the silk fabric is washed;

[0027] (2) Laccase-TEMPO catalyzed oxidation of silk grafted with polylysine: the silk treated in step (1) was catalyzed and oxidized by a laccase-TEMPO system, and grafted with polylysine; treatment process prescription and conditions: laccase 5U / mL, TEMPO 2g / L, ε-polylysine (molecular weight 3500) 2.5g / L, pH 4.5, temperature 30°C, time 3 hours; after the treatment, the silk was washed and dried.

[0028] Sample 1: without step (1), (2) treatment...

Embodiment 2

[0033] Carry out the antibacterial finishing of the mulberry silk fiber after removing sericin with the method mentioned in the present invention;

[0034] (1) Enzymatic conversion of amino acids in silk: silk is impregnated with serine hydroxymethyltransferase;

[0035] Treatment process prescription and conditions: Serine hydroxymethyltransferase 10U / mL, pyridoxal 5-phosphate 1mmol / L, tetrahydrofolate 10mmol / L, formaldehyde 12.5mmol / L, pH 8.5, temperature 37°C, treatment time 8 hours ;Wash the silk fabric after the treatment;

[0036] (2) Laccase-TEMPO catalyzed oxidation of silk grafted with polylysine: the silk treated in step (1) was catalyzed and oxidized with laccase-TEMPO system, and grafted with polylysine; treatment process prescription and conditions: laccase 50U / mL, TEMPO15g / L, ε-polylysine (molecular weight 4800)9g / L, pH 5.5, temperature 40°C, time 12 hours; after the treatment, the silk was washed and dried.

[0037] Sample 4: without step (1), (2) treatment; ...

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Abstract

The invention discloses a silk antibacterial finishing method based on enzyme-catalyzed conversion and grafting. Glycine in protein fiber macromolecules is catalyzed by utilizing serine hydroxymethyltransferase to be converted into serine, the number of serine in silk fibers can be increased, then the serine in the silk fibers is catalytically oxidized by utilizing laccase and a 2,2,6,6-tetramethyl pyridine-nitrogen-oxide (TEMPO) system to generate an aldehyde group, the aldehyde group is cross-linked with polylysine to perform the silk antibacterial finishing treatment. The silk antibacterial finishing method comprises the following steps: (1) enzymatically converting amino acid in silk; and (2) catalytically oxidizing silk grafted polylysine by virtue of laccase-TEMPO. Compared with thetraditional chemical cross-linking method antibacterial finishing treatment, the silk treated in the method of the invention has good antibacterial performance, mild enzyme treatment condition, and higher physical and mechanical properties compared with an un-treated sample.

Description

technical field [0001] The invention relates to an antibacterial finishing method of real silk based on enzymatic transformation and grafting, and belongs to the field of textile biotechnology. Background technique [0002] Silk fiber is composed of sericin and silk fibroin. During the degumming process, the sericin component with a spherical protein structure is dissolved by alkaline agent or hydrolyzed by protease, while silk fibroin with high chemical stability is effectively retained. Silk fiber is a protein-based fiber product. Under appropriate temperature and humidity conditions, it is easy to become a nutrient for bacteria, molds and other microorganisms, which will cause mildew in the fabric and may even become a carrier for disease transmission. Therefore, in order to improve the performance of real silk as a high-grade fiber product, it is necessary to carry out antibacterial finishing processing to real silk fiber or real silk fabric. [0003] At present, the co...

Claims

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Application Information

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IPC IPC(8): D06M16/00D06M15/59D06M101/10
CPCD06M15/59D06M16/00D06M16/003D06M2101/10
Inventor 王平王琳袁久刚余圆圆邓超
Owner JIANGNAN UNIV
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