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Method for preparing 6-O-carboxymethyl chitin by using imidazole ionic liquid

A technology of carboxymethyl chitin and imidazole ionic liquid, which is applied in the field of preparation of 6-O-carboxymethyl chitin, can solve the problems of low degree of substitution, large pollution, uneven substitution, etc., and achieve uniform substitution and high degree of substitution high effect

Inactive Publication Date: 2018-07-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a homogeneous method for preparing 6-O-carboxymethyl chitin, which solves the problems of large pollution, low degree of substitution and uneven substitution in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix 0.05g chitin with a particle size of 60 mesh, 0.057g sodium chloroacetate and 1g 1-ethyl-3-methylimidazolium acetate ([Emim]OAc) evenly, and heat at 80°C for 3 hours to obtain a clear viscous thick solution. Add hydrochloric acid solution with a mass concentration of 5%, and stir at room temperature for 3 hours to obtain a flocculent white precipitate, which is centrifuged to obtain a white solid, washed with distilled water, and dried to obtain 6-O-carboxymethyl chitin with a yield of 95%. .

Embodiment 2

[0020] After mixing 0.05g chitin with a particle size of 120 mesh, 0.057g sodium chloroacetate and 1g 1-ethyl-3-methylimidazole acetate ([Emim]OAc) evenly, heat at 80°C for 3 hours to obtain a clear viscous thick solution. Add hydrochloric acid solution with a mass concentration of 5%, and stir at room temperature for 3 hours to obtain a flocculent white precipitate, which is centrifuged to obtain a white solid, washed with distilled water, and dried to obtain 6-O-carboxymethyl chitin with a yield of 95%. .

Embodiment 3

[0022] After mixing 0.05g chitin with a particle size of 60 mesh, 0.057g sodium chloroacetate and 5g 1-ethyl-3-methylimidazole acetate ([Emim]OAc), heat at 80°C for 3 hours to obtain a clear viscous thick solution. Add hydrochloric acid solution with a mass concentration of 5%, and stir at room temperature for 3 hours to obtain a flocculent white precipitate, which is centrifuged to obtain a white solid, washed with distilled water, and dried to obtain 6-O-carboxymethyl chitin with a yield of 97%. .

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Abstract

The invention relates to a method for preparing 6-O-carboxymethyl chitin by using imidazole ionic liquid. The method comprises the following steps: evenly mixing chitin, sodium chloroacetate and ionicliquid according to a certain ratio and then dissolving at a certain temperature for a certain period of time so as to obtain a clear and bright mixed solution; adding a dilute hydrochloric acid aqueous solution into the mixed solution, and stirring for a certain period of time at the room temperature so as to obtain white flocculent precipitate; carrying out centrifugal separation to obtain a white solid, washing the obtained white solid with distilled water, and drying to obtain the product of 6-O-carboxymethyl chitin. The method realizes homogeneous phase preparation of the 6-O-carboxymethyl chitin by using the ionic liquid as a solvent, and increases the reaction efficiency; furthermore, the ionic liquid used in the method is not easily volatilized, so that the method is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of marine chemical engineering and relates to a method for preparing 6-O-carboxymethyl chitin by using imidazolium ionic liquid. Background technique [0002] Chitin is a biological polysaccharide widely present in crustacea shrimp, crab shells, insect shells, seaweed and fungal cell walls. It has good biocompatibility, biodegradability, antibacterial properties and promotes wound healing. properties such as healing. However, chitin has a large number of intermolecular and intramolecular hydrogen bonds, making it insoluble in conventional organic solvents, which limits its use. Therefore, chemical modification of chitin to improve its solubility can expand its application range. Among them, 6-O-carboxymethyl chitin is a common chitin derivative, which has good biocompatibility, biodegradability, antibacterial properties, etc., and is widely used in textiles, medicine, cosmetics and food processing and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
CPCC08B37/003Y02P20/54
Inventor 吕兴梅冯咪张杰石春艳周清侯丹峰张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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