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Method for preparing chitosan by using shrimp shells

A technology of chitosan and shrimp shells, which is applied in the field of food processing, can solve the problems of difficult control of the reaction process, high lye concentration and high reaction temperature, and achieve the effects of narrow molecular weight distribution range, simple equipment and safe operation

Inactive Publication Date: 2012-12-12
ZHONGSHAN FLASHLIGHT POLYTECHNIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method overcomes the long reaction time, it still adopts the traditional strong alkali high temperature method, which has problems such as high alkali concentration and reaction temperature, and difficult control of the reaction process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Collect 100kg of shrimp shells, wash the shrimp shells with tap water, dry and pulverize them to obtain 40-mesh sieved shrimp shell powder, add 25kg of tap water to adjust the moisture content of the shrimp shell powder to 20%, put the shrimp shell powder with adjusted moisture into the extrusion In the explosion spraying equipment, extrude, spray, explode and extrude the extruded shrimp shell powder with a feed rate of 25kg / h, a screw speed of 240r / min, and a spray explosion temperature of 110°C, and then crush the expanded shrimp shell powder to 80 mesh and sieve it before adding it. Tap water was dissolved to a solid content of 20% to obtain a shrimp shell powder slurry, and the pH value of the slurry was adjusted to 4.0 with citric acid and sodium hydroxide, and 100 U / g of blue plow enzyme fermentation liquid was added, and the shrimp shell powder was prepared at 40 ° C. Enzyme hydrolyze the shrimp shell powder slurry at the enzymatic hydrolysis temperature for 6 hou...

Embodiment 2

[0060] Collect 100kg of shrimp shells, wash the shrimp shells with tap water, dry and crush them to obtain 40-mesh sieved shrimp shell powder, add 31.6kg of tap water to adjust the moisture content of the shrimp shell powder to 24%, put the adjusted moisture into the squeezed In the pressure spraying and explosion equipment, the extruding, spraying and exploding puffing is carried out at a puffing feed rate of 28kg / h, a screw speed of 260r / min, and a spraying explosion temperature of 120°C. Add tap water to dissolve to a solid content of 25% to obtain a slurry of shrimp shell powder, adjust the pH value of the slurry to 5.0 with citric acid and sodium hydroxide, add 150 U / g of blue plowshare enzyme fermentation broth, Enzymolyze the shrimp shell powder slurry at 50°C for 7 hours, add compound protease 600U / g to the slurry of shrimp shell powder with deacetylase, and enzymolyze it at 60°C for 3 hours, and deproteinize the shrimp shell powder Add citric acid with a mass concentr...

Embodiment 3

[0063] Collect 100kg of shrimp shells, wash the shrimp shells with tap water, dry and pulverize them to obtain 40-mesh sieved shrimp shell powder, add 39kg of tap water to adjust the moisture content of the shrimp shell powder to 28%, put the shrimp shell powder with adjusted moisture into the extrusion In the explosion spraying equipment, extrude, spray, explode and expand with the feed rate of 25kg / h, the screw speed of 240r / min, and the explosion temperature of 130°C. The expanded shrimp shell powder is crushed to 80 mesh and sieved for the second time before adding Tap water was dissolved to a solid content of 30% to obtain a slurry of shrimp shell powder. The pH value of the slurry was adjusted to 5.5 with citric acid and sodium hydroxide, and 200 U / g of blue plow enzyme fermentation liquid was added. Enzymolyze the shrimp shell powder slurry at ℃ for 8 hours, add complex protease 400U / g to the deacetylase shrimp shell powder slurry, and enzymolyze it at 60°C for 4 hours, ...

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PUM

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Abstract

The invention discloses a method for preparing chitosan by using shrimp shells. The method comprises the following steps: collecting shrimp shells; successively flushing, drying and crushing the shrimp shells; adjusting water content in shrimp shell powder to 20 to 30% with tap water; carrying out extrusion explosion puffing; crushing the puffed shrimp shell powder again and adding tap water to dissolve the shrimp shell powder; adjusting a pH value of an obtained slurry to 4.0 to 5.5; carrying out enzymatic hydrolysis on the shrimp shell slurry with bio-enzyme fermentation broth so as to remove acetylenzyme; then adding protease for enzymatic hydrolysis to remove proteins; carrying out rinsing; then adding organic acid and carrying out stirring for 2 to 3 h so as to remove a calcium salt in the shrimp shells; carrying out rinsing; adding a hydrogen peroxide solution for immersion decoloring; carrying out rinsing until a product becomes white; and finally carrying out vacuum drying until water content is less than 5%. The method provided by the invention has the characteristics of a simple and mature process, simple equipment, short preparation time, convenient operation, good continuity, high production efficiency, an ideal product form, no pollution, suitability for industrial production, widely and easily available raw materials, conservation of energy and convenience in popularization and popularization.

Description

【Technical field】 [0001] The invention relates to a method for preparing chitosan, in particular to a method for preparing chitosan by utilizing shrimp shells, and belongs to the field of food processing. 【Background technique】 [0002] Chitin, also known as chitin, its chemical name is (1,4)-2-acetylamino-2-deoxy-β-D-glucose, which is composed of N-acetylamino-D-glucopyranose monomer through β→1 , a straight-chain polymer compound formed by 4 glycosidic bonds. It is the nitrogen-containing natural organic polymer substance with the largest amount in nature except protein, and widely exists in crustaceans, arthropods and bacterial cell walls, and is praised by European and American academic circles after protein, fat, sugar, vitamin and inorganic salt The sixth element of life. [0003] Chitosan (chitosan), also known as chitosan, deacetylated chitin, its chemical name is β-(1,4)-2-amino-2-deoxy-D-glucan, it is white amorphous, translucent , A solid with a slight pearl lu...

Claims

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Application Information

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IPC IPC(8): C12P19/04C08B37/08
Inventor 肖丽凤邬海雄吴小禾
Owner ZHONGSHAN FLASHLIGHT POLYTECHNIC
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