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Method for hydrolyzing chitin and chitosan

A technology of chitosan and chitin, which is applied in the production of sugar, fructose, sugar and other directions, can solve the problems of long production cycle of biological hydrolysis method, pollution of chemical reagents, high price of enzymes, etc., and achieves high yield, The effect of accelerating the reaction rate and improving the hydrolysis efficiency

Active Publication Date: 2011-07-27
苏州九一高科无纺设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is aimed at the low yield and poor quality of the existing physical hydrolysis of chitin and chitosan; the long production cycle of the biological hydrolysis and the high price of enzymes; the presence of chemical reagents in the chemical law will cause pollution to the environment Insufficient, provide an efficient, green, high yield method for hydrolyzing chitin and chitosan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In the reaction vessel, 0.15 g of chitosan was added to 5 g of binary mixed ionic liquid (BMImCl:HMImCl=9:1, w / w), and heated to 110° C. under mechanical stirring for a period of time until the solution was transparent. Then 0.015 g of water, 1.8 g of dimethyl sulfoxide, and 1.4 g of acid-functionalized ionic liquid 1-methyl-3-(3-sulfopropyl)imidazolium bisulfate were added, and stirring was continued at 110° C. for 0.5 h. Then, the reaction container was placed in a microwave oven, 800W microwave was used for 1 min, and the reaction was quenched with cold water. The analysis results showed that the yield of total reducing sugar was 88.8%.

Embodiment 2

[0034] In the reaction vessel, the chitosan of 0.15g was added in 5g binary mixed ionic liquid (AMImCl:HMImCl=9:1, w / w, AMImCl is 1-allyl-3-methylimidazolium chloride salt), mechanically stirred Heat to 110°C for a period of time until the solution becomes transparent. Then 0.015 g of water, 1.8 g of dimethyl sulfoxide, and 1.4 g of acid-functionalized ionic liquid 1-methyl-3-(3-sulfopropyl)imidazolium bisulfate were added, and stirring was continued at 110° C. for 0.5 h. Then, the reaction container was placed in a microwave oven, 800W microwave was used for 1 min, and the reaction was quenched with cold water. Analysis results showed that the yield of total reducing sugars was 92.7%.

Embodiment 3

[0036] In the reaction vessel, 0.15 g of chitosan was added to 5 g of binary mixed ionic liquid (AMImCl:HMImCl=9:1, w / w), and heated to 110° C. under mechanical stirring for a period of time until the solution was transparent. Then 0.015 g of water, 1 g of dimethyl sulfoxide, and 1.4 g of acid-functionalized ionic liquid 1-methyl-3-(3-sulfopropyl)imidazolium bisulfate were added, and stirring was continued at 110° C. for 0.5 h. Then, the reaction container was placed in a microwave oven, 800W microwave was used for 1 min, and the reaction was quenched with cold water. The analysis results showed that the yield of total reducing sugar was 73.5%.

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Abstract

The invention relates to a method for hydrolyzing chitin and chitosan, in particular to a method for jointly hydrolyzing chitin and chitosan through a physical method and a chemical method. The method for hydrolyzing chitin and chitosan comprises the following steps that: the chitin or chitosan is taken as a raw material, binary mixed ionic liquid is taken as a solvent for the chitin or chitosan,acid functionalized ionic liquid is taken as a catalyst for hydrolysis, a water and strong polar co-solvent is added, and hydrolysis reaction is performed under the microwave reaction condition; and the obtained product is analyzed through ion chromatography, gel permeation chromatography and infrared, and the content of total reducing sugar is measured by an Imoto method. The method for hydrolyzing chitin and chitosan has the advantages of high efficiency, environmental friendliness, and high yield.

Description

technical field [0001] The invention relates to a method for hydrolyzing chitin and chitosan, in particular to a combined method for hydrolyzing chitin and chitosan by comprehensive physical and chemical methods. Background technique [0002] Chitin is a polysaccharide linked by N-acetyl-2-amino-D-glucose in the form of β-1,4 glycosidic bonds, widely present in the shells of crustaceans, shrimps, crabs, insects, fungi (yeast, in the cell walls of fungi) and in the cell walls of plants such as mushrooms. As a renewable resource, the annual biosynthesis of chitin is about 1.0×10 10 t, second only to cellulose column. After treatment, chitin becomes deacetylated into chitosan, and chitosan has one more active amino group than chitin. [0003] Chitin and chitosan have relatively large molecular weight and poor solubility. They cannot be directly dissolved in water, and are not easily absorbed in the human body. Generally, inorganic acids are used as solvents, which cause harm...

Claims

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Application Information

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IPC IPC(8): C13K13/00C13K1/00C13K5/00C13K7/00C13K11/00
CPCY02P20/54
Inventor 吴廷华肖文军陈沁
Owner 苏州九一高科无纺设备有限公司
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