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Process for producing chitosan

A chitosan and shell technology, applied in the field of chitosan preparation, can solve the problems of low viscosity and high impurities

Inactive Publication Date: 2003-08-20
广东梅雁蓝藻有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Existing extraction of chitin and chitosan not only uses shrimp and crab shells, but also uses fly maggots, fly pupae, fly shells, silkworm pupae, duster insects, cockroaches and fungal mushrooms, which generally have the problems of high impurities and low viscosity

Method used

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Examples

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Embodiment 2

[0008] Take 1 kg of dried crab legs that have been cut into flakes and put them into a reactor filled with 10 kg of 2% hydrochloric acid solution, turn them intermittently, soak for 12 hours, wash with water until neutral and centrifuge; take out all the crab legs and put them into In 8 kg of 6% sodium hydroxide solution, at 80°C, stir constantly, boil for 5 hours, wash with water until neutral, repeat this acid-base process alternately twice, wash with water until neutral, and obtain chitin. After the second acid leaching, it can be washed with 0.1% sodium hydroxide until the pH is 6, then washed with water until neutral, and centrifuged. Put the above-mentioned chitin into 8 kg of 65% sodium hydroxide solution, stir continuously at 85°C, react for 2 hours, wash twice with water, and boil for 30 minutes after the last wash, repeat the same alkali treatment twice in this way, Wash with water after each alkali treatment, that is, there are two water washes in the middle. Final...

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Abstract

A process for preparing chitosan used in food, textile and medicine fields features use of shrimps shell and crab leg as raw materials, and includes such steps as selecting raw material, alkali and acid treating three times, and deacetylating while water washing twice for thoroughly removing protein, fat, colour and calcium to obtain macro-molecular high-viscosity chitosan. Its advantage is high yield up to 94.6%.

Description

technical field [0001] The invention relates to a method for preparing chitosan, in particular to a method for preparing chitosan from dried shrimp shells or dried crab legs. Background technique [0002] Existing extraction of chitin and chitosan not only uses shrimp and crab shells, but also uses fly maggots, fly pupae, fly shells, silkworm pupae, duster insects, cockroaches and fungal mushrooms, which generally have the problems of high impurities and low viscosity. . Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing chitosan with high yield, high degree of dehexylation and high viscosity. [0004] The present invention can be realized in the following manner, and its preparation method is: (1) take 1 part (parts by weight) of dried shrimp shell or dried crab leg, cut off the sharp claws, and cut the tubular shape into flakes; (2) dry the dried shrimp The shell or dried crab legs are put into 8-10 parts (parts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08
Inventor 李江平王成祥丘增萍王建勇
Owner 广东梅雁蓝藻有限公司
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