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Preparing water soluble chitosan or in small molecular weight through radiation method

A technology for water-soluble chitosan and chitosan, which is applied in the field of preparing low-molecular-weight water-insoluble or low-molecular-weight water-soluble chitosan, and can solve the problems of environmental pollution, unsuitable cost, food and agricultural purposes with strict requirements, and high cost of enzymes. question

Inactive Publication Date: 2005-01-12
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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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

[0025] Refined high molecular weight chitosan (molecular weight M η =5.8×10 5 gmol -1 , deacetylation degree DA ≥ 90%, nitrogen content N% = 7.47, provided by Zhejiang Yuhuan Marine Biology Co., Ltd.) the solid is put into a polyethylene plastic bag, sealed directly or filled with nitrogen after vacuuming, 60 Co γ-ray irradiation degradation, dose 200kGy, dose rate 9.0kGyh -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 η =5.6×10 4 gmol -1 , yield 90.0%, N%=6.10. Infrared spectra and WAXD curves before and after irradiation are shown in Figures 2 and 3.

Embodiment 2

[0027]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). Degradation by γ-ray irradiation at room temperature, dose 100kGy, dose rate 7.0kGyh -1 . Post-treatment to get water-soluble low molecular weight chitosan, molecular weight M η =1.7×10 4 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

[0029] 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), under room temperature gamma-ray Irradiation degradation, dose 25kGy, dose rate 0.35kGyh -1 . Post-treatment to get water-soluble low molecular weight chitosan, molecular weight M η =1.2×10 4 gmol -1 , yield 60%, N%=6.00. 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 small molecular weight or water-solubility chitosan by using radiation process. It is characterized by that a refined high molecular weight chitosan solid or solution can be irradiated by using 60 Co gamma-rays and degraded, and the degradation product is undergone the after-treatment steps of dissolution and decolouration, etc. so as to obtain the invented small molecular weight or water-solubility chitosan. Said chitosan has several purposes, can be used as agricultural production-increasing agent, food drying agent, natural anti-bacterial material and bio-medicine material, etc.

Description

technical field [0001] The present invention involves the use of radiation methods ( 60 Co gamma-ray) method for preparing low molecular weight water-insoluble or small molecular weight water-soluble chitosan. 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 a...

Claims

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Application Information

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IPC IPC(8): C08B37/08
Inventor 景遐斌于海军陈学思徐效义吕常海
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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