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Method for preparing water-soluble chitosan through radiation process

A water-soluble chitosan and chitosan technology, applied in the field of new materials, can solve problems such as complex fermentation processes, unsuitable food and agricultural uses with strict cost requirements, and environmental pollution

Inactive Publication Date: 2012-05-30
DALIAN CHUANGDA TECH TRADE MARKET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the acid degradation method or oxidation method often uses concentrated acid or alkali, which causes a certain degree of environmental pollution. It is not suitable to be advocated today when environmental protection is valued.
The enzymatic degradation method that has appeared recently has the characteristics of high efficiency and low environmental pollution, but the cost of the enzyme used for degradation is too high, and it involves a very complicated fermentation process, which is not suitable for food and agricultural applications that have strict requirements on cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The refined high molecular weight chitosan (molecular weight Mn=5.8×10Sgmol -1 , deacetylation degree DA ≥ 90%, nitrogen content N% = 7.47, provided by Zhejiang Yuhuan Marine Biology Co., Ltd.) put the solid into a polyethylene plastic bag, seal it directly or fill it with nitrogen after vacuuming, 60 Coγ-ray irradiation degradation, dose 200kGy, dose rate 9.0 kGyh -1 . The irradiated solid is dissolved with acetic acid or hydrochloric acid solution, and post-treated to obtain low molecular weight chitosan, molecular weight M. =5.6×104 gmol -1 Yield 90. O%, N%=6.10. Infrared spectra and WAXD curves before and after irradiation are shown in Figures 2 and 3.

Embodiment 2

[0026] High molecular weight chitosan (with embodiment 1) is made into 5% (w) acetic acid solution, and the concentration of acetic acid is 1.5% (w). at room temperature 60 Co gamma-ray irradiation degradation, dose 100kGy, dose rate 7. ikB -1 Post-treatment to obtain water-soluble low molecular weight chitosan, molecular weight M. =1.7×104 gmol -1 Yield 60%, N%=6.90. Infrared spectra and WAXD curves before and after irradiation are shown in Figures 2 and 3.

Embodiment 3

[0028] High molecular weight chitosan (with embodiment 1) is made into 5% (w) acetic acid solution, and acetic acid concentration is 1.5% (w), adds hydrogen peroxide to its content and is 5.0% (w), room temperature Degradation under γ-ray irradiation, dose 25kGy, dose rate 0.35 kGyh -1 Water-soluble low-molecular-weight chitosan obtained after post-treatment, molecular weight Mn=1.2×104 gmol -1 Yield 60%, N%=6. oo. Infrared spectra and WAXD curves before and after irradiation are shown in Figures 2 and 3.

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Abstract

The invention belongs to a method for preparing water-soluble chitosan through a radiation process. Small molecular weight or water-soluble chitosan is obtained by carrying out radiation degradation on a refined solid or solution of high molecular weight chitosan by using 60Cogamma rays, and carrying out post-processing steps of a degradation product, such as dissolving, decolourizing and the like. The method is convenient to operate, rapid, simple, convenient, high in yield, good in repeatability, easy to control molecular weight, environment-friendly, low in pollution and low in cost. The method not only can be used for rapidly preparing a few water-soluble chitosan samples but also has further industrial possibility. The obtained chitosan is multifunctional and can be used as an agricultural output increasing agent, a food drying agent, a natural antibacterial material, a biomedical material and the like.

Description

technical field [0001] The invention belongs to the field of new materials, in particular to a method for preparing water-soluble chitosan by radiation method. Background technique [0002] Chitosan is the deacetylated product of the natural product chitin, and its chemical structure is a polysaccharide linked by 2-amino-2-deoxy-D-glucose with β-1,4 glycosidic bonds. Chitosan molecule contains active amino groups, which can be positively charged, and is the only natural alkaline polysaccharide. There are active hydroxyl groups on the sugar ring, so chitosan has good hydrophilicity and water retention. In recent years, people have conducted extensive research on the properties and functions of chitosan, and found that chitosan has important applications in industries such as agriculture, environment, food, biology, medicine, and materials. [0003] Low-molecular-weight chitosan or oligosaccharide has obvious antibacterial activity and water retention, as well as the biolo...

Claims

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Application Information

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IPC IPC(8): C08B37/08
Inventor 王爽
Owner DALIAN CHUANGDA TECH TRADE MARKET
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