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Method for preparing high deacetylate degree and high viscosity chitosan by using shrimp shell

A technology of high deacetylation degree and chitosan, which is applied in the field of preparing high deacetylation degree and high viscosity chitosan by using shrimp shells, can solve the problems of low utilization rate of shrimp shells, low product purity and high production cost, and achieves The effect of good decolorization effect, high viscosity and short reaction time

Inactive Publication Date: 2008-06-18
湖北东方天琪生物工程股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problems of low utilization rate of shrimp shells, low product purity and high production cost when preparing chitin and other bioactive substances from existing shrimp shells.
[0005] The invention also solves the technical problems of existing shrimp shells such as difficulty in fresh keeping and storage

Method used

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  • Method for preparing high deacetylate degree and high viscosity chitosan by using shrimp shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: After washing and draining the fresh shrimp shells, place them in a microwave oven, control the temperature at 80°C, and heat for 15 minutes; then break the shrimp shells and immerse them in a concentration of 10 at a ratio of material to liquid weight ratio of 1:15. % NaOH solution, put it in a microwave oven, control the temperature at 100°C, take it out and filter after heating for 10 minutes, rinse the shrimp shell with water until it is neutral and dry it to obtain a deproteinized shrimp shell; Immerse in 2mol / L HCl solution and soak for 24 hours according to the ratio of feed-to-liquid weight ratio of 1:12, then filter and spin dry to obtain decalcified shrimp shells; The decalcified shrimp shell is treated once again with 10% NaOH solution, filtered, rinsed with clear water until neutral, placed in 1mol / L HCL solution according to the ratio of material to liquid weight ratio of 1:12, soaked for 24 hours, Filter, rinse the shrimp shells until neutral an...

Embodiment 2

[0024] After washing and draining the fresh shrimp shells, place them in a microwave oven, control the temperature at 80°C, and heat for 10 minutes; then break the shrimp shells and immerse them in a 5% NaOH solution at a ratio of 1:10 by weight of material to liquid Then put it in a microwave oven, control the temperature at 100°C, take it out and filter after heating for 15 minutes, rinse the shrimp shell with clean water until it is neutral and dry it to obtain the deproteinized shrimp shell; Ratio of 1:12 was immersed in 2mol / L HCl solution and soaked for 24 hours, then filtered and dried to obtain decalcified shrimp shells; The ratio is treated once more with 5% NaOH solution, filtered, rinsed with clear water until neutral, placed in 1mol / L HCL solution according to the ratio of material to liquid weight ratio of 1:12, soaked for 24 hours, filtered, and the shrimp shell Rinse the body until it is neutral and dry it; decolorize the above-mentioned shrimp shells in the sun...

specific Embodiment 3

[0025] After washing and draining the fresh shrimp shells, place them in a microwave oven, control the temperature at 100°C, and heat for 12 minutes; then break the shrimp shells and immerse them in an 8% NaOH solution at a ratio of 1:12 by weight of material to liquid Then put it in a microwave oven, control the temperature at 100°C, take it out and filter after heating for 12 minutes, rinse the shrimp shell with clean water until it is neutral and dry it to obtain the deproteinized shrimp shell; Ratio of 1:12 was immersed in 2mol / L HCl solution and soaked for 24 hours, then filtered and dried to obtain decalcified shrimp shells; The ratio is treated once more with 8% NaOH solution, filtered, rinsed with clear water until neutral, placed in 1mol / L HCL solution according to the ratio of material to liquid weight ratio of 1:12, soaked for 24 hours, filtered, and the shrimp shell Rinse the body until it is neutral and dry it; decolorize the above-mentioned shrimp shells in the s...

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Abstract

A preparation method of chitosan with high deacetylation degree and high viscosity through shrimp shell includes the following steps: microwave drying and fresh-keeping are carried out on the raw materials; the deproteinization reaction between the shrimp shell and alkali solution with 5 to 10 percents concentration should be heated by microwave; the deacetylation reaction between chitin and NaOH solution with 45 to 50 percents concentration should be heated by microwave. After all the reactions, ethanol solution of the chitosan and the NaOH is obtained in the present invention for further deacetylation reaction. The present invention has the advantages of less acid and alkali use, short reaction time, economy, environmental protection, etc. The chitosan prepared by the present invention is the white or light yellow powder with high deacetylation degree and high viscosity, which can be widely applied in the fields of environmental protection, food, medicine, etc.

Description

technical field [0001] The invention relates to a method for preparing chitosan, in particular to a method for preparing chitosan with high deacetylation degree and high viscosity by using shrimp shells. Background technique [0002] Chitin is a polymer polysaccharide with a chemical structure similar to that of fiber. It is widely found in the hard shells of insects and crustaceans and the cell walls of fungi. After deacetylation of chitin, the product is chitosan. Chitosan has good biodegradability, biocompatibility, and no toxic side effects. Due to the higher degree of deacetylation and viscosity of chitin, the stronger its functionality, such as the production of high-quality flocculants, the immobilization of living cells and enzymes, and the production of reverse osmosis membranes and ultrafiltration membranes often require high deacetylation. Acetyl degree and high viscosity chitosan. However, in the traditional chitosan production process, due to the difficulty i...

Claims

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Application Information

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IPC IPC(8): C08B37/08
Inventor 黄代勇刘雯蔡永刚
Owner 湖北东方天琪生物工程股份有限公司
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