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Preparation method for chitosan

A technology of chitosan and shrimp shells is applied in the field of preparation of polymer polysaccharides, which can solve problems such as environmental pollution and achieve the effect of improving yield

Inactive Publication Date: 2014-03-26
徐广苓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to statistics, chitin accounts for 21.6% of the dry weight of shrimp shells, but for a long time, except for a small amount of resources in shrimp shells, most of them are thrown away as garbage and pollute the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of preparation method of chitosan, this preparation method comprises following production technique:

[0019] (1) Shrimp shell cleaning and impurity removal;

[0020] (2) First soak the shrimp shells with 4% sodium hydroxide solution for 5 hours, and wash the soaked shrimp shells with water twice;

[0021] (3) Then soak the shrimp shells with 5% hydrochloric acid solution for 5 hours, wash the soaked shrimp shells with clean water twice, and circulate until no bubbles are generated after adding acid;

[0022] (4) Rinse and dry to obtain chitin;

[0023] (5) Deacetylation of chitin, chitin was added to a sodium hydroxide solution with a mass fraction of 40%, the solid-liquid ratio of chitin to sodium hydroxide solution was 1:60, and the reaction was carried out at 85°C for 14 hours;

[0024] (6) Press filter the reacted solution, wash it, and dry it in an oven at 80°C to obtain chitosan.

[0025] The yield of chitin prepared by the preparation method is 6.2...

Embodiment 2

[0027] A kind of preparation method of chitosan, this preparation method comprises following production technique:

[0028] (1) Shrimp shell cleaning and impurity removal;

[0029] (2) First soak the shrimp shells with 6% sodium hydroxide solution for 46 hours, and wash the soaked shrimp shells with clean water twice;

[0030] (3) Then soak the shrimp shells with 7% hydrochloric acid solution for 3 hours, wash the soaked shrimp shells with clean water twice, and recycle until no bubbles are generated after adding acid;

[0031] (4) Rinse and dry to obtain chitin;

[0032] (5) Deacetylation of chitin, adding chitin to sodium hydroxide solution with a mass fraction of 55%, the solid-liquid ratio of chitin to sodium hydroxide solution is 1:65, and reacting at 95°C for 10 hours;

[0033] (6) Press filter the reacted solution, wash it, and dry it in an oven at 80°C to obtain chitosan.

[0034] The yield of chitin prepared by the preparation method is 6.5%, and the degree of...

Embodiment 3

[0036] A kind of preparation method of chitosan, this preparation method comprises following production technique:

[0037] (1) Shrimp shell cleaning and impurity removal;

[0038] (2) First soak the shrimp shells with 5.5% sodium hydroxide solution for 4.5 hours, and wash the soaked shrimp shells with clean water twice;

[0039] (3) Then soak the shrimp shells with 6.5% hydrochloric acid solution for 4.5 hours, wash the soaked shrimp shells with clean water twice, and circulate the treatment until no bubbles are generated after adding acid;

[0040] (4) Rinse and dry to obtain chitin;

[0041] (5) Deacetylation of chitin, adding chitin to a sodium hydroxide solution with a mass fraction of 52%, and reacting at 88°C for 12 hours;

[0042] (6) Press filter the reacted solution, wash it, and dry it in an oven at 80°C to obtain chitosan.

[0043] The yield of chitin prepared by the preparation method is 6.5%, and the degree of deacetylation of chitosan is 87.2%.

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PUM

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Abstract

The invention discloses a preparation method for chitosan. The method comprises the following production steps: (1) cleaning shrimp shells and removing impurities; (2) soaking the shrimp shells with 4-6 percent of a sodium hydroxide solution for 4-5 h; (3) soaking the shrimp shells with 5-7 percent of a hydrochloric acid solution for 3-5 h, performing circular process until no bubbles are produced when acid is added; (4) poaching and drying, so that chitin is obtained; (5) performing deacetylation on the chitin; (6) filter pressing and washing the solution obtained after reaction, and drying, so as to obtain the chitosan. According to the invention, the value in use of the shrimp shells is increased, and the degree of deacetylation of the chitosan is further improved.

Description

technical field [0001] The invention relates to a preparation method of high molecular polysaccharide, in particular to a preparation method of chitosan. Background technique [0002] Chitin is light beige to white in appearance, soluble in concentrated hydrochloric acid, phosphoric acid, sulfuric acid, etc., insoluble in alkali and other organic solvents, and insoluble in water. Chitin is the only positively charged positive dietary fiber. It is widely used in industrial, medical, beauty and other fields. [0003] Chitosan is obtained by deacetylation of chitin, which exists widely in nature, and its chemical name is polyglucosamine (1-4)-2-amino-B-D glucose. Since 1859, Frenchman Rouget first obtained chitosan , the excellent properties of this natural polymer such as biofunctionality, compatibility, blood compatibility, safety, and microbial degradation have attracted widespread attention from all walks of life. It is widely used in medicine, food, chemical industry, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 徐广苓
Owner 徐广苓
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