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Method for extracting chitin from snail shells

A technology of chitin and snail shell, which is applied in the field of comprehensive utilization of aquatic product processing waste, can solve the problems of low extraction rate and low purity of chitin, improve the purity and extraction rate, avoid deacetylation and glycosidic bond breakage, protect The effect of molecular structure

Inactive Publication Date: 2019-07-26
广西桂螺农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for extracting chitin from snail shells in view of the lack of chitin extraction method from snail shells and the problems of low chitin purity and low extraction rate in existing chitin extraction methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for extracting chitin from snail shells, comprising the following steps:

[0047] a. Powdering: Take 1 part of the snail shell from which the snail meat has been removed, wash with water to remove the remaining viscera, drain the water, and pulverize into snail shell powder according to the weight ratio;

[0048] b. Deproteinization: Take the snail shell powder, add 10 parts of sodium hydroxide solution with a mass fraction of 3% by weight, soak at 60°C for 4 hours, then filter, collect the filter residue I, and then wash the filter residue I with water until medium property, to obtain deproteinized snail shell powder;

[0049] c. Decalcification: take deproteinized snail shell powder, add 10 parts of hydrochloric acid solution and 20 parts of guanidine ionic liquid with a mass fraction of 1% by weight, stir evenly and let stand for 10 hours, then add 5 parts of acid mixture, Then filter, collect the primary filter residue and primary filtrate, then add 10 par...

Embodiment 2

[0058] A method for extracting chitin from snail shells, comprising the following steps:

[0059] a. Powdering: according to the weight ratio, take 8 parts of the snail shell from which the snail meat has been removed, wash with water to remove the remaining viscera, drain the water, and pulverize into snail shell powder;

[0060] b. Deproteinization: Take the snail shell powder, add 40 parts of sodium hydroxide solution with a mass fraction of 10% according to the weight ratio, soak at 90 ° C, after soaking for 2 hours, add 13 parts of protective solution, stir evenly, and then Continue soaking so that the total soaking time is 10 hours, then filter, collect the filter residue I, then wash the filter residue I with water until neutral, and obtain deproteinized snail shell powder;

[0061] Wherein, the protective solution includes raw materials in the following weight ratios: 3 parts of sodium alginate, 4 parts of diethyl carbonate, 8 parts of cyclomethicone and 21 parts of ac...

Embodiment 3

[0071] A method for extracting chitin from snail shells, comprising the following steps:

[0072] a. Powdering: according to the weight ratio, take 2.5 parts of the snail shell from which the snail meat has been removed, wash with water to remove the remaining viscera, drain the water, and pulverize into snail shell powder;

[0073] b. Deproteinization: take snail shell powder, add 15 parts of sodium hydroxide solution with a mass fraction of 5% in proportion by weight, soak at 65 ° C, after soaking for 1.5 hours, add 5.5 parts of protective solution, stir evenly, and then Continue soaking so that the total soaking time is 6 hours, then filter, collect the filter residue I, then wash the filter residue I with water until neutral, and obtain deproteinized snail shell powder;

[0074] Wherein, the protective solution includes raw materials in the following weight ratios: 1.5 parts of sodium alginate, 2.5 parts of diethyl carbonate, 4 parts of cyclomethicone and 15 parts of aceto...

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Abstract

The invention provides a method for extracting chitin from snail shells and particularly relates to the technical field of aquatic product processing waste comprehensive utilization. The method includes: grinding, removing protein, removing calcium, decoloring and drying. The method has the advantages that the coordination of guanidine ion liquid and acid mixed liquid in the calcium removing and decoloring steps is beneficial to chitin structure protection and the removing of metal compound impurities such as calcium and pigment impurities; meanwhile, the ionic liquid for dissolving the chitincan be recycled, and greenness and environment protection are achieved; the chitin extraction rate of the method is more than twice of that of a conventional extraction method, the deacetylation degree of the extracted chitin is more than 30% lower than that of chitin extracted by the conventional extraction method, and the purity of the chitin is increased evidently; the method is simple to operate, controllable in process and easy to achieve large-scale production; the waste snail shells after snail meat production can be sufficiently utilized, and environment protection and resource savingare benefited.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of comprehensive utilization of aquatic product processing waste, in particular to a method for extracting chitin from snail shells. [0003] 【Background technique】 [0004] Chitin is a kind of acetylglucosamine polymer widely present in crustaceans, insects and fungi. In organisms, it is often covalently linked with proteins and mixed with inorganic salts and pigments. The deacetylation product of chitin is chitosan, so the degree of deacetylation can be used to characterize the purity of chitin. Generally, the degree of deacetylation below 50% is called chitin. Chitin is stable in nature and insoluble in water, dilute acid, dilute alkali and general organic solvents, but long-term exposure to acid and alkali will still cause certain damage to its molecular structure, and it will remove acetyl groups under concentrated alkali conditions. Under strong oxidizing conditions, glycosidic bonds will be b...

Claims

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Application Information

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IPC IPC(8): C08B37/08
CPCC08B37/0003C08B37/003
Inventor 梁延军
Owner 广西桂螺农业科技有限公司
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