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Method for extracting chitin from shrimp and crab shells by using eutectic ionic liquid

A technology of deep eutectic melting of shrimp and crab shells, applied in the application field of chemical industry, can solve the problem of no application of chitin extraction, achieve the effects of easy control of reaction, mild conditions, and reduction of environmental pollution

Active Publication Date: 2016-06-01
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has no application in the extraction of chitin

Method used

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  • Method for extracting chitin from shrimp and crab shells by using eutectic ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Pre-treatment of lobster shells: remove foreign matter on the inner and outer surfaces of lobster shells, rinse with water, soak in ethanol solution, rinse with water several times, dry, grind, and sieve, and take powder below 100 mesh for use;

[0020] (2) Preparation of deep eutectic ionic liquid: mix choline chloride and thiourea in a molar ratio of 1:1 in a reaction vessel, and stir in a water bath with a reaction temperature of 90°C until all become colorless transparent liquids , to obtain the eutectic ionic liquid;

[0021] (3) Add the shrimp shell powder obtained in step (1) to the eutectic ionic liquid synthesized in step (2) in a mass ratio of 1:15, and continue stirring for 2 hours when the reaction temperature is 90° C.;

[0022] (4) Cool the reactant obtained in step (3) to room temperature, pour it into a centrifuge tube and centrifuge at a speed of 4000r / min for 5min, take the supernatant and add distilled water as a reverse solvent for washing, and c...

Embodiment 2

[0024] (1) Pre-treatment of lobster shells: remove foreign matter on the inner and outer surfaces of lobster shells, rinse with water, soak in ethanol solution, rinse with water several times, dry, grind, and sieve, and take powder below 100 mesh for use;

[0025] (2) Synthesis of deep eutectic ionic liquid: mix choline chloride and thiourea in a molar ratio of 1:1 in a reaction vessel, stir in a water bath with a reaction temperature of 90° C. until all become colorless transparent liquids , to obtain the eutectic ionic liquid;

[0026] (3) Add the shrimp shell powder obtained in step (1) to the deep eutectic ionic liquid synthesized in step (2) at a liquid-to-material ratio of 20:1, and stir for 2 hours when the reaction temperature is 110° C.;

[0027] (4) Cool the reactant obtained in step (3) to room temperature, pour it into a centrifuge tube and centrifuge at a speed of 4000r / min for 5min, take the supernatant and add distilled water as a reverse solvent for washing, an...

Embodiment 3

[0029] (1) Pre-treatment of lobster shells: remove foreign matter on the inner and outer surfaces of lobster shells, rinse with water, soak in ethanol solution, rinse with water several times, dry, crush, and sieve, and take powder below 100 mesh for use;

[0030] (2) Synthesis of deep eutectic ionic liquid: mix choline chloride and thiourea in a molar ratio of 1:1 in a reaction vessel, stir in a water bath with a reaction temperature of 90° C. until all become colorless transparent liquids , to obtain the eutectic ionic liquid;

[0031] (3) Add the shrimp shell powder obtained in step (1) into the eutectic ionic liquid synthesized in step (2) at a liquid-to-solid ratio of 20:1, and stir for 4 hours when the reaction temperature is 110° C.;

[0032] (4) Cool the reactant obtained in step (3) to room temperature, pour it into a centrifuge tube and centrifuge at a speed of 4000r / min for 5min, take the supernatant and add distilled water as a reverse solvent for washing, and cent...

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Abstract

The invention relates to a method for extracting chitin from shrimp and crab shells by using eutectic ionic liquid. The method comprises the following steps: clearing the shrimp and crab shells, soaking in ethanol, cleaning, drying, crushing and the like to obtain shrimp and crab shell powder; mixing choline chloride and thiourea according to a certain proportion, adding into a reaction container, heating in a water bath, and stirring to obtain the eutectic ionic liquid; adding the shrimp and crab shell powder into the eutectic ionic liquid according to a certain mass ratio, heating, stirring and reacting for a certain period of time, taking water as a reverse-phase solvent, centrifugating, separating and drying to obtain the chitin. The method has the characteristics as follows: by virtue of a synergistic effect of the cheap, non-toxic and easily-prepared eutectic ionic liquid prepared from the choline chloride and the thiourea, the solvent and a catalyst, the chitin in the shrimp and crab shells is separated and extracted at an atmospheric pressure, so that the method has the characteristics of a mild treatment condition, a simple extraction process, and high easiness in controlling the reaction; meanwhile, the eutectic ionic liquid is recyclable, so that environment pollution and energy consumption are reduced.

Description

technical field [0001] The invention relates to the field of chemical industry application, in particular to a method for extracting chitin from shrimp and crab shells with a deep eutectic ionic liquid. Background technique [0002] As the second largest renewable resource in nature, chitin is second only to cellulose, with an annual output of more than 1 billion tons. It is widely found in lower algae, fungus cells, shells of shrimp, crabs and insects in nature, and in the shells of plants. Cell wall, etc., are the only natural alkaline polysaccharides that exist in large quantities in nature, and its derivative chitosan is praised by scientists as the sixth life element after proteins, sugars, fats, vitamins, and minerals. Because chitin has many unique advantages, such as biodegradable, safe and non-toxic, good biocompatibility and stable chemical properties, etc., it has been widely used in food industry, environmental protection, medicine, agriculture, textile, function...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
CPCC08B37/003C08B37/0003C08L5/08
Inventor 连海兰朱萍孙香陈玲潘明珠杨蕊黄润洲梁星宇顾忠基颉盼盼
Owner NANJING FORESTRY UNIV
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