Method for synthesizing polymer of amphoteric chitosan

A technology of chitosan polymer and synthesis method, applied in the field of analytical biology, can solve the problem of single performance of chitosan derivatives, and achieve the effect of wide application range and improved pH value stability

Inactive Publication Date: 2007-10-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The performance of chitosan can be improved in varying degrees by the above modification methods, but because chitosan is chemically modified by a single method, the performance of chitosan derivatives obtained is often relatively single, which cannot make chitosan Simultaneously have two or more performance

Method used

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  • Method for synthesizing polymer of amphoteric chitosan

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Embodiment 1

[0018] The preparation method of amphoteric chitosan polymer of the present invention adopts following processing steps:

[0019] 100g degree of deacetylation is dissolved in 90% chitosan in 1000ml 5% acetic acid solution, and dissolves into chitosan solution while stirring. Pass N at 90°C 2 Add 0.5mmol / L initiator cerium ammonium nitrate solution and DMDAAC aqueous solution 20g successively under gas and stirring conditions, and react for 3h to obtain cerium ammonium nitrate solution. The cerium ammonium nitrate solution obtained above was cooled at 40°C, precipitated with 70% ethanol, washed with methanol for 3 times, filtered with a vacuum pump, and dried in vacuo to obtain a crude product, then the crude product was extracted with 50ml of acetone in a Soxhlet extractor After extracting for 6 hours to remove the homopolymer, dry for 10 hours at 70° C. and a vacuum of 0.5 MPa to obtain quaternized chitosan. Add 100 g of quaternized chitosan to 1000 ml of isopropanol as a s...

Embodiment 2

[0023] The preparation method of amphoteric chitosan polymer of the present invention adopts following processing steps:

[0024] 100g degree of deacetylation is dissolved in 90% chitosan in 1000ml 8% acetic acid solution, dissolve while stirring, and pass N at 90°C 2 Add 0.7mmol / L initiator cerium ammonium nitrate solution and 60 g of DMDAAC aqueous solution successively under gas and stirring conditions, and react for 7 hours to obtain cerium ammonium nitrate solution. The cerium ammonium nitrate solution obtained above was cooled at 45°C, precipitated with 80% ethanol, washed with methanol for 4 times, filtered with a vacuum pump, and dried in a vacuum to obtain a crude product, which was then extracted with acetone in a Soxhlet extractor. After removing the homopolymer by extraction for 14 hours, dry it for 12 hours at 80° C. and a vacuum of 0.8 MPa to obtain quaternized chitosan. Add 100 g of quaternized chitosan to 1000 ml of isopropanol as a solvent, add 40% sodium hyd...

Embodiment 3

[0026] The preparation method of amphoteric chitosan polymer of the present invention adopts following processing steps:

[0027] 100g degree of deacetylation is dissolved in 90% chitosan in 1000ml 10% acetic acid solution, dissolve while stirring, and pass N at 90°C 2 Add 1.0 mmol / L initiator cerium ammonium nitrate solution and 100 g of DMDAAC aqueous solution successively under gas and stirring conditions, and react for 10 h to obtain cerium ammonium nitrate solution. Cool at 50°C, precipitate with 80% ethanol, wash with methanol for 5 times, filter with a vacuum pump, and dry in a vacuum to obtain a crude product, then extract the crude product with acetone in a Soxhlet extractor for 20 hours to remove the homopolymer Finally, dry at 100° C. for 15 hours under the condition of a vacuum of 1.0 MPa to obtain quaternized chitosan. 100g of quaternized chitosan is added to 1000ml of solvent isopropanol, and a concentration of 50% sodium hydroxide is added, and alkalized at 60°...

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Abstract

This invention relates to a method for synthesizing amphiphilic chitosan. The method comprises: dissolving chitosan, reacting, precipitating, cooling, washing, vacuum-filtering, vacuum-drying, alkalizing, carboxymethylating, desalting, dehydrating and drying to obtain amphiphilic chitosan. The method introduces electrically negative carboxymethyl group and electrically positive quaternary ammonium group onto the molecular chain of chitosan, thus the molecular chain of chitosan contains substituents with two different charge types. After modification, the quaternization degree and the carboxymethylation degree of chitosan are 80% and 70%, respectively. Amphiphilic chitosan has higher apparent viscosity, higher solubility, lower pH value, better pH stability, and wider applications than chitosan.

Description

technical field [0001] The invention relates to a synthesis method of amphoteric chitosan polymer, which belongs to the technical field of analytical biology. Background technique [0002] Organic matter in living things is the main expression form of life on earth and the basis of today's biological science and technology. They are composed of three major components: carbohydrates, proteins and ribose. The organic matter that exists in nature and is produced the most every year is carbohydrates or polysaccharides. The largest number of polysaccharides is cellulose, followed by chitin, and then starch. Chitin exists in a large amount in solid wastes after processing crustaceous aquatic products such as shrimp shells and crab shells. If these wastes are piled up for two or three days, they will become rancid and cause environmental pollution. Chitosan is obtained by deacetylation of chitin and is the only alkaline polysaccharide in nature. Chitin and chitosan are widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 龙柱张荣于丽娜
Owner JIANGNAN UNIV
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