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Rtechnique for extracting chitin in high molecular weight

A high molecular weight, chitin technology, applied in the fields of bioengineering, polymer compounds and chemical industry, can solve the problems of low relative molecular weight of chitin, high cost of EDTA, cumbersome production process, etc., and achieve mild performance and simplified production process. , the effect of reducing costs

Inactive Publication Date: 2007-07-25
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the cost of EDTA is relatively high. Although it can be recycled in the production process, it makes the production process more complicated, the equipment cost increases, and the relative molecular weight of the obtained chitin is not high.

Method used

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  • Rtechnique for extracting chitin in high molecular weight

Examples

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Effect test

Embodiment 1

[0013] 10 kg of separated, screened and cleaned shrimp shells were air-dried at about 80°C for 5-8 hours, then soaked in 8% citric acid solution at room temperature for 22 hours, filtered, washed with water until neutral, and dried. Then add 8% NaOH solution, boil and stir for 2 hours, filter, wash with water until neutral, and spin dry. Add 8% citric acid solution again, soak at room temperature for 22 hours, filter, spin dry, wash with water until neutral, and blow dry at 80°C to obtain white or slightly flesh-colored chitin finished product. Add the resulting chitin product into 45% NaOH solution, soak and stir at 65°C for 15 hours, carry out deacetylation treatment twice, filter, wash with water until neutral, spin dry, and blow dry at 80°C to obtain white, Translucent, slightly pearly chitosan products, the degree of deacetylation DD is greater than 80%, and the molecular weight is higher than 180,000.

Embodiment 2

[0015] 10kg of separated, screened and cleaned shrimp shells were air-dried at about 80°C for 5-8 hours, then soaked in 16% citric acid solution at room temperature for 12 hours, filtered, washed with water until neutral, and dried. Then add 8% NaOH solution, boil and stir for 3 hours, filter, wash with water until neutral, and spin dry. Add 16% citric acid solution again, soak at room temperature for 12 hours, filter, spin dry, wash with water until neutral, and blow dry at 80°C to obtain white or slightly flesh-colored chitin finished product. Add the resulting chitin product into 45% NaOH solution, soak and stir at 65°C for 15 hours, carry out deacetylation treatment twice, filter, wash with water until neutral, spin dry, and blow dry at 80°C to obtain white, Translucent, slightly pearly chitosan products, the degree of deacetylation DD is greater than 80%, and the molecular weight is higher than 180,000.

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Abstract

This invention discloses a new technique for extracting high molecular weight chitin. This invention utilizes shrimp shell as the raw material, and adopts citric acid decalcification technique to obtain chitin, which does no harm to the molecular chain of chitin, and can keep the natural state of chitin. Compared with the present HCl and EDTA decalcification techniques, this new technique can obtain high molecular weight (higher than 180000) chitin with a yield increased by more than 12%.

Description

technical field [0001] The invention relates to a high-molecular-weight chitin extraction technology, which belongs to the technical fields of bioengineering, high molecular compound and chemical industry. Background technique [0002] Chitin is a natural high-molecular-weight biological polysaccharide that widely exists in the shells of crustaceans such as shrimps and crabs, the shells of insects, the cell walls of fungi (yeast, mold) and the cell walls of plants (such as mushrooms). It exists in nature The quantity of chitin is second only to cellulose, and the quality of chitin varies greatly due to different sources of raw materials and production process conditions. [0003] At present, the following two processes are generally used for the extraction of chitin: one is to screen, wash, and crush shrimp and crab shells, and then process them through dilute HCl decalcification and NaOH deproteinization. In this kind of process, the raw materials undergo multiple pickling...

Claims

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Application Information

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IPC IPC(8): C08B37/08
Inventor 李思东钟杰平欧春艳章超桦何四凤
Owner GUANGDONG OCEAN UNIVERSITY
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