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Solvent composition for dissolving chitin

A solvent composition and a technology for chitin, which are applied in the fields of agricultural engineering and natural polymers, can solve the problems that chitin solution is easy to form gel, and achieve the effects of being conducive to environmental protection, rapid dissolution and low price

Active Publication Date: 2013-04-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, NaOH / urea aqueous solution is used as a solvent, chitin powder must be mixed with NaOH / urea aqueous solution and go through a freeze-thaw cycle process to dissolve chitin, and the obtained chitin solution is easy to form a gel, which limits its large-scale application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Add 0.5g of chitin powder to 9.5g of 2wt% KOH aqueous solution, stir evenly, freeze overnight in the refrigerator, and then thaw at room temperature to obtain a chitin solution with a concentration of 0.5wt%. There are no visible particles in the solution, and chitin is completely dissolved.

Embodiment 2

[0070] Add 2g of chitin powder to 98g of 8wt% KOH aqueous solution, stir evenly, freeze in the refrigerator for 4 hours, and then thaw at room temperature to obtain a chitin solution with a concentration of 2wt%. There are no visible particles in the solution, and chitin is completely dissolved.

Embodiment 3

[0072] Precool 94g of 15wt% KOH aqueous solution to -15°C, add 6g of chitin powder and stir for 3 minutes, and the chitin is directly dissolved to obtain a chitin solution with a concentration of 6wt%. Use an ultracentrifuge at 10,000 rpm and 10°C for 30 minutes, pour out the chitin solution, there are no visible particles in the solution, no micelles precipitate at the bottom of the centrifuge tube, and the chitin is completely dissolved. The resulting chitin solution is very stable and can be placed at room temperature for more than one week.

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PUM

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Abstract

The invention discloses a novel solvent for dissolving chitin by a freezing-unfreezing method or a direct dissolving method, and a use of the solvent composition. The solvent is a KOH aqueous solution, and further comprises any combination of LiOH, NaOH, urea or thiourea. The chitin and the solvent are mixed and then frozen to a point lower than a freezing point, and unfrozen at a point higher than the freezing point to obtain the chitin solution; or, the solvent is pre-cooled to the freezing point of 0 DEG C, and then the chitin is added to the cooled solvent for continuous stirring for more than 3 minutes, so that the chitin is quickly dissolved to form a transparent chitin solution. The chitin solution prepared in the invention can be processed into a chitin finished product of any form, for example, a film type, a plate type, a tubular type, a block type, a granulate type and a fiber type, and further can be processed into various chitin derivatives. The solvent composition is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to a solvent composition for dissolving chitin and a method for dissolving chitin by using the solvent composition, which belongs to the field of natural macromolecules and also belongs to the field of agricultural engineering. Background technique [0002] Chitin is a 1,4-linked 2-acetylamino-2-deoxy-β-D-glucan widely present in the cell walls of insects, crustaceans and fungi. Every year, chitin biosynthesized on the earth can reach tens of billions of tons, and it is the second largest renewable natural polymer after cellulose in nature. A large number of studies have shown that chitin has properties such as biocompatibility and biodegradability, as well as properties such as hemostasis, analgesia, promotion of wound healing, antibacterial, and adsorption of heavy metal ions. However, due to the high crystallinity of chitin, a large number of intramolecular and intermolecular hydrogen bonds, and insolubility in water and commo...

Claims

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Application Information

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IPC IPC(8): C08J3/03C08L5/08
Inventor 蔡杰黄俊超张俐娜
Owner WUHAN UNIV
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