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Method for extracting chitin from waste shrimp shells

A technology for chitin and shrimp shells, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve the problem that inorganic calcium and protein are difficult to be extracted, high-concentration acid-base waste liquid treatment is difficult, chitin Problems such as low yield, to achieve the effect of improving utilization value, low processing cost, improving purity and extraction rate

Inactive Publication Date: 2020-09-11
江苏美鑫食品科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing chitin extraction process uses a large amount of acid and alkali to remove inorganic calcium and protein in shrimp shells or crab shells to obtain chitin. Inorganic calcium and protein are difficult to be extracted and utilized, resulting in waste of resources; at the same time, it is very difficult and costly to treat high-concentration acid-base waste liquid, which leads to very low chitin production and high prices, resulting in chitin Low sugar yields prevent it from being widely used

Method used

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  • Method for extracting chitin from waste shrimp shells
  • Method for extracting chitin from waste shrimp shells
  • Method for extracting chitin from waste shrimp shells

Examples

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Effect test

Embodiment 1

[0025] The invention provides a method for extracting chitin from discarded shrimp shells, comprising:

[0026] Step 1: soak and clean the collected discarded shrimp shells, then dry them, after drying, put them into a pulverizer and pulverize them for 1 hour, and pulverize them into powder;

[0027] Step 2: Add protease hydrolyzate to the shrimp shell powder, and then stir it for 4 hours. After the stirring is completed, filter and wash it with water, and combine the filtrate to obtain the deproteinized shrimp shell powder and protein enzymatic hydrolyzate ;

[0028] Step 3: add dilute hydrochloric acid with a concentration of 1 mol / L to the deproteinized shrimp shell powder for decalcification treatment, stop adding acid when the pH of the system drops to 5, and filter and wash with water after reacting for 3 hours to obtain dilute hydrochloric acid residual calcium chloride solution and crude chitin, and dry the crude chitin;

[0029] Step 4: Add sodium acetate solution t...

Embodiment 2

[0039] The invention provides a method for extracting chitin from discarded shrimp shells, comprising:

[0040] Step 1: soak and clean the discarded shrimp shells collected, then dry it, after drying, put it into a pulverizer and pulverize it for 1.3 hours, and pulverize it into powder;

[0041] Step 2: Add protease hydrolyzate to the shrimp shell powder, and then stir it for 4.5 hours. After the stirring is completed, filter and wash it with water, and combine the filtrate to obtain deproteinized shrimp shell powder and protein enzymatic hydrolyzate ;

[0042] Step 3: add dilute hydrochloric acid with a concentration of 1 mol / L to the deproteinized shrimp shell powder for decalcification treatment, stop adding acid when the pH of the system drops to 5.3, and filter and wash with water after reacting for 3.5 hours to obtain dilute hydrochloric acid residual calcium chloride solution and crude chitin, and dry the crude chitin;

[0043] Step 4: Add sodium acetate solution to t...

Embodiment 3

[0053] The invention provides a method for extracting chitin from discarded shrimp shells, comprising:

[0054]Step 1: soak and clean the discarded shrimp shells collected, then dry them, and after drying, put them into a pulverizer and pulverize them for 1.5 hours, and pulverize them into powder;

[0055] Step 2: Add protease hydrolyzate to the shrimp shell powder, then stir it for 5 hours, filter and wash it with water after stirring, combine the filtrate, and obtain the deproteinized shrimp shell powder and protein enzymatic hydrolyzate ;

[0056] Step 3: add dilute hydrochloric acid with a concentration of 1 mol / L to the deproteinized shrimp shell powder for decalcification treatment, stop adding acid when the pH of the system drops to 5.5, and filter and wash with water after reacting for 4 hours to obtain dilute hydrochloric acid residual calcium chloride solution and crude chitin, and dry the crude chitin;

[0057] Step 4: Add sodium acetate solution to the calcium ch...

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Abstract

The invention relates to a method for extracting chitin from waste shrimp shells. The method comprises the following steps: firstly, performing deproteinization treatment by using protease prawn shellpowder to obtain protein enzymatic hydrolysate; then, using dilute hydrochloric acid for carrying out decalcification treatment on the deproteinized shrimp shell powder to obtain crude chitin; addinga sodium acetate solution into the decalcified solution to obtain solid calcium acetate and a sodium chloride solution; concentrating the sodium chloride solution into a saturated solution, salting out the protein enzymatic hydrolysate to obtain solid protein, and finally performing decolorization treatment on the crude chitin by using ethanol and distillation to obtain the chitin with relativelyhigh purity; the method is simple in process, acid-base waste liquid is avoided, and the problem of waste water pollution puzzling chitin production is solved; in addition, recycling of inorganic calcium, protein and astaxanthin is achieved, resource waste is reduced, and the utilization value of the waste shrimp shells is increased.

Description

technical field [0001] The invention relates to the technical field of chitin extraction, in particular to a method for extracting chitin from discarded shrimp shells. Background technique [0002] Chitin, also known as chitin, was discovered by French scholar Braqueno in 1811 and extracted from crustacean shells by Ogier in 1823. It is light beige to white, soluble in concentrated hydrochloric acid / phosphoric acid / sulfuric acid / acetic acid, insoluble in alkali And other organic solvents, insoluble in water. Chitosan, a deacetylated derivative of chitin, is insoluble in water but soluble in some dilute acids. Chitosan can be added to food as a preservative. Hazard, but it will not affect the flavor of food. [0003] The existing chitin extraction process uses a large amount of acid and alkali to remove inorganic calcium and protein in shrimp shells or crab shells to obtain chitin. Inorganic calcium and protein are difficult to be extracted and utilized, resulting in waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08C07C403/24C07C51/41C07C53/10C12P21/06
CPCC07C51/412C07C403/24C08B37/0003C08B37/003C12P21/06C07C2601/16C07C53/10
Inventor 舒德昌
Owner 江苏美鑫食品科技有限公司