Supercharge Your Innovation With Domain-Expert AI Agents!

Basic solvent for dissolving chitosan and using method thereof

An alkaline solvent, chitosan technology, applied in the field of solvent for dissolving chitosan, can solve the problems of chitosan molecular weight reduction, polydispersity, chitosan instability, etc., to avoid performance degradation, simple preparation process, The effect of avoiding degradation problems

Inactive Publication Date: 2011-08-24
ZHEJIANG UNIV
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan is extremely unstable in an acidic solution. When the acid dissolves chitosan, the long chain of chitosan will be partially hydrolyzed and the glycosidic bond will be broken, forming many fragments with different molecular weights. The molecular weight reduction and polydispersity of polysaccharides lead to insufficient performance of processed products, which limits the application of chitosan

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 20 grams of sodium hydroxide and 5 grams of potassium hydroxide were mixed, and then 975 grams of water were added to obtain an alkaline solvent.

[0017] Disperse 20 grams of chitosan powder with a deacetylation degree of 70% and a molecular weight of 420,000 in the above-mentioned alkaline solvent, let it stand until it is fully swollen, and then repeatedly freeze and thaw the fully swollen suspension at -20°C to 0°C 4 times to obtain a transparent chitosan solution. Gained solution is vacuum-filtered with 400 order microporous filter membrane, and solution can be filtered completely, and gained solution does not exist without naked eye visible insoluble matter, shows that chitosan can dissolve completely in the alkaline solvent that this example makes. The solution was placed for 1 month, and there was no obvious thinning phenomenon, indicating that the chitosan alkaline solution was relatively stable.

Embodiment 2

[0019] First add 2 grams of sodium hydroxide to 948 grams of water to form a solution, then add 50 grams of potassium hydroxide to obtain an alkaline solvent. Disperse 36 grams of chitosan powder with a deacetylation degree of 40% and a molecular weight of 380,000 in the above-mentioned alkaline solvent, let it stand until it is fully swollen, and then repeatedly freeze and thaw the fully swollen suspension at -20°C to 0°C 5 times to obtain a transparent chitosan solution. Gained solution is vacuum-filtered with 400 order microporous filter membrane, and solution can be filtered completely, and gained solution does not exist without naked eye visible insoluble matter, shows that chitosan can dissolve completely in the alkaline solvent that this example makes. The solution was placed for 1 month, and there was no obvious thinning phenomenon, indicating that the chitosan alkaline solution was relatively stable.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a basic solvent for dissolving chitosan, and the components and the content of percentage by weight are that caustic soda 0.2-2%, caustic potash 0.1-5% and others are water. The process for the solvent to dissolve chitosan comprises dispersing chitosan powder whose deacetylation degree is 40-70% and molecular weight is 200 thousand to 600 thousand in basic solvent, standing till the solvent is completely swelling, and repeatedly freezing the suspending liquid which is completely swelling under the temperature of below 20 DEG C to 0 DEG C, unfreezing for many times to get transparent chitosan solution. The solvent of the invention which is utilized to dissolve chitosan can get stable solution, thereby avoiding the problem that the chitosan is degraded in acid, performance reduction which is caused by the degradation of chitosan products is avoided, the solution can be applied in researching the relationship of the dissolving action and molecular structure of the chitosan, and the invention can be widely applied in contour machining of the products such as chitosan film, chitosan fiber and the like.

Description

technical field [0001] The invention relates to a solvent for dissolving chitosan, in particular to an alkaline solvent for dissolving chitosan and its usage. Background technique [0002] Chitosan is the only natural alkaline polysaccharide existing in nature, and it is one of the largest biological resources in nature. It has excellent biological activity, biocompatibility and degradability, antibacterial, antiseptic, hemostasis and can promote wound healing, and can be widely used in medical care and environmental protection. Chitosan molecules have special regularity, and there are strong hydrogen bonds between molecules, which make them have good film-forming and fiber-forming properties. It is a popular research object for biomaterials in recent years. High value-added products are currently hot spots in the deep processing of natural resources. However, like other polysaccharide macromolecules with strong hydrogen bonds between molecules, chitosan is easy to dehydra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08
Inventor 胡巧玲樊敏沈家骢
Owner ZHEJIANG UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com