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A method for preparing moderately deacetylated water-soluble chitin from shrimp and crab shells

A technology of deacetylated chitin and water-soluble chitin is applied in the field of preparation of chitin polysaccharide and can solve the problems of low reaction temperature and the like

Inactive Publication Date: 2020-06-05
TAIZHOU INST OF SCI &TECH NUST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that deacetylation is carried out under homogeneous conditions, the existing technology is to carry out the reaction at 25°C. Due to the low reaction temperature, it takes as long as 48-72 hours for the degree of deacetylation of chitin to reach 50%.

Method used

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  • A method for preparing moderately deacetylated water-soluble chitin from shrimp and crab shells
  • A method for preparing moderately deacetylated water-soluble chitin from shrimp and crab shells

Examples

Experimental program
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Effect test

Embodiment 1

[0077] (1) Decalcification: After crushing the net shrimp and crab shells, gradually add 6% hydrochloric acid for decalcification. After adding hydrochloric acid, the solid particles will no longer produce bubbles, and when the pH of the system drops to 3-4, stop adding hydrochloric acid. After standing for 2 hours, separate The solid is obtained to obtain decalcified shrimp and crab shell powder;

[0078] (2) Decolorization: mix the decalcified shrimp and crab shell powder obtained in step (1) with 80% concentrated formic acid solution, the mass ratio of solid to liquid is 1:10, and after stirring to dissolve the pigment, it is separated from solid and liquid, washed with water, and dried, and the obtained The solid is decolorized shrimp and crab shell powder;

[0079] (3) Dissolving: the decolorized shrimp and crab shell powder obtained in step (2) is mixed with the mixed caustic aqueous solution of sodium hydroxide and lithium hydroxide, the solid-liquid mass ratio is 1: 70...

Embodiment 2

[0085] (1) Decalcification: After crushing the net shrimp and crab shells, gradually add 6% hydrochloric acid for decalcification. After adding hydrochloric acid, the solid particles will no longer produce bubbles, and when the pH of the system drops to 3-4, stop adding hydrochloric acid. After standing for 2 hours, separate The solid is obtained to obtain decalcified shrimp and crab shell powder;

[0086] (2) Decolorization: Mix the decalcified shrimp and crab shell powder in step (1) with 85% concentrated formic acid solution, the solid-to-liquid ratio is 1:9, stir to dissolve the pigment, and then separate solid-liquid, wash with water, and dry to obtain a solid It is decolorized shrimp and crab shell powder;

[0087] (3) Dissolving: the decolorized shrimp and crab shell powder obtained in step (2) is mixed with the mixed caustic aqueous solution of sodium hydroxide and lithium hydroxide, the solid-liquid mass ratio is 1: 60, and the composition of the mixed caustic aqueous...

Embodiment 3

[0093] (1) Decalcification: After crushing the net shrimp and crab shells, gradually add 6% hydrochloric acid for decalcification. After adding hydrochloric acid, the solid particles will no longer produce bubbles, and when the pH of the system drops to 3-4, stop adding hydrochloric acid. After standing for 2 hours, separate The solid is obtained to obtain decalcified shrimp and crab shell powder;

[0094] (2) Decolorization: Mix the decalcified shrimp and crab shell powder in step (1) with 90% concentrated formic acid solution, the solid-to-liquid ratio is 1:15, stir to dissolve the pigment, and then separate solid-liquid, wash with water, and dry to obtain a solid It is decolorized shrimp and crab shell powder;

[0095] (3) Dissolving: the decolorized shrimp and crab shell powder obtained in step (2) is mixed with the mixed caustic aqueous solution of sodium hydroxide and lithium hydroxide, the solid-liquid mass ratio is 1: 65, and the composition of the mixed caustic aqueou...

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Abstract

The invention discloses a method of preparing moderate deacetylation water-soluble chitin by using shrimp-and-crab shells as raw material. The method comprises the steps that i, mixed caustic alkali of sodium hydroxide and lithium hydroxide is used to prepare into aqueous solution to dissolve the shrimp-and-crab shells, wherein the mixed caustic alkali aqueous solution comprises by mass 8-18% of NaOH, 1-4% of LiOH, and the rest being unavoidable impurities and water; and ii, freezing operation is conducted on the obtained solution from i at lower than the freezing point temperature of the aqueous solution. The method of preparing moderate deacetylation water-soluble chitin by using shrimp-and-crab shells as raw material is expected to be widely used in industry, particularly can be potentially applied to acid alkalis irritate sensitive occasions.

Description

Technical field: [0001] The invention relates to a preparation method of chitin polysaccharide. Specifically, it relates to a method for preparing moderately deacetylated water-soluble chitin by dissolving it in a solution and simultaneously performing deproteinization and deacetylation reactions in a dissolved state by using shrimp and crab shells as raw materials, which belongs to aquatic product processing waste Take advantage of technical areas. Background technique [0002] Chitin is a polysaccharide formed by N-acetyl-2-amino-2-deoxy-D-glucose connected by β-1,4-glycosidic bonds, and is the main component of the cell wall of fungi and the exoskeleton of arthropods. An important class of natural polymer materials, which have certain applications in the fields of industry, medicine, clothing, cosmetics, and environmental protection. However, due to the existence of a large number of intramolecular and intermolecular hydrogen bonds, chitin has poor solubility and cannot...

Claims

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Application Information

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IPC IPC(8): C08B37/08
CPCC08B37/0003C08B37/003
Inventor 陈冬年徐开泉刘显明马静顾焰波游余海汤小芳夏昊云
Owner TAIZHOU INST OF SCI &TECH NUST