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High-efficiency preparation method for production of new chitosan

A chitosan, a new type of technology, applied in the field of high-efficiency preparation of new chitosan production, can solve the problems of high production cost, low production cost, high viscosity, etc., and achieve the effect of reducing production cost

Pending Publication Date: 2020-02-04
YANGZHOU RIXING BIO TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the invention provides a novel high-efficiency preparation method for chitosan production, which has the advantages of high viscosity and low production cost, and solves the problem that the prepared chitosan has a general viscosity and relatively low production cost. high problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one: a kind of novel chitosan, comprise the raw material of following parts by weight ratio: 2 parts of shrimp shell powder, 120 parts of 7% HCL solution, 120 parts of 10% NAOH solution, 12 parts of 95% ethanol solution, no 12 parts of water ethanol and 60 parts of 50% NAOH solution.

[0022] Another technical problem to be solved in the present invention is to provide a kind of high-efficiency preparation method for novel chitosan production, comprising the following steps:

[0023] 1) Take 2 parts of shrimp shell powder and 120 parts of 7% HCL solution, add 2 parts of shrimp shell powder to 60 parts of 7% HCL solution, soak and stir at room temperature for 20 hours, then filter and discard the filtrate , to obtain solid A;

[0024] 2) Rinse the fixed product A prepared in step 1) several times with distilled water until it becomes neutral, then soak the solid product A with 60 parts of 10% NAOH solution at a constant temperature of 40°C for 20 hours, then ...

Embodiment 2

[0028] Embodiment two: a kind of novel chitosan, comprise the raw material of following parts by weight ratio: 5 parts of shrimp shell powder, 150 parts of HCL solution of 7%, 150 parts of 10% NAOH solution, 15 parts of 95% ethanol solution, no 15 parts of water ethanol and 100 parts of 50% NAOH solution.

[0029] Another technical problem to be solved in the present invention is to provide a kind of high-efficiency preparation method for novel chitosan production, comprising the following steps:

[0030] 1) Take 5 parts of shrimp shell powder and 150 parts of 7% HCL solution, add 5 parts of shrimp shell powder to 75 parts of 7% HCL solution, soak and stir at room temperature for 24 hours, then filter, discard the filtrate, Solid A is obtained;

[0031] 2) Rinse the fixed product A prepared in step 1) several times with distilled water until it is neutral, then soak the solid product A with 75 parts of 10% NAOH solution at a constant temperature of 60°C for 24 hours, then fil...

Embodiment 3

[0035] Embodiment three: a kind of novel chitosan, comprise the raw material of following parts by weight ratio: 3.5 parts of shrimp shell powder, 135 parts of HCL solution of 7%, 135 parts of 10% NAOH solution, 13.5 parts of 95% ethanol solution, no 13.5 parts of water ethanol and 80 parts of 50% NAOH solution.

[0036] Another technical problem to be solved in the present invention is to provide a kind of high-efficiency preparation method for novel chitosan production, comprising the following steps:

[0037] 1) Take 3.5 parts of shrimp shell powder and 135 parts of 7% HCL solution, add 3.5 parts of shrimp shell powder to 67.5 parts of 7% HCL solution, soak and stir at room temperature for 22 hours, then filter, discard the filtrate, Solid A is obtained;

[0038]2) Rinse the fixed product A prepared in step 1) several times with distilled water until it becomes neutral, then soak the solid product A with 67.5 parts of 10% NAOH solution at a constant temperature of 50°C for...

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PUM

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Abstract

The invention relates to the technical field of preparation of chitosan, and discloses a new chitosan. The new chitosan includes the following raw materials: in parts by weight, 2-5 parts of shrimp shell powder, 120-150 parts of a 7% HCl solution, 120-150 parts of a 10% NaOH solution, 12-15 parts of a 95% ethanol solution, 12-15 parts of absolute ethanol and 60-100 parts of a 50% NaOH solution. According to a high-efficiency preparation method for production of the new chitosan, the shrimp shell powder is adopted, and a commonly-used one-off short-time high-temperature boiling method can be changed into a long-time medium-temperature intermittent immersion method according to the physical and chemical properties of lobster shells, so that the chitosan with high degree of deacetylation is obtained, and the quality indexes of food-grade chitosan are met; during the experiment, long-term treatment is performed at medium temperature by using strong acids and strong bases of low concentration, fracture of beta-1,4-glycosidic bonds in the chitosan is reduced, and high-viscosity chitosan can be obtained; and at the same time, decolorized ethanol is recovered through distillation, the concentrated base liquid for deacetylation is recovered and diluted for second deproteinization, and recycling is achieved, so that the production cost is reduced effectively.

Description

technical field [0001] The invention relates to the technical field of chitosan preparation, in particular to a novel high-efficiency preparation method for chitosan production. Background technique [0002] Chitosan is the product of N-deacetylation of chitin. Under the action of its internal and external hydrogen bonds, it is chemically stable, soluble in dilute acids, and almost insoluble in water and organic solvents, thus limiting chitosan to a large extent. Application development, and water-soluble chitosan is a low-molecular-weight chitosan that can be directly dissolved in water. It has functions such as being easily absorbed by the human body, anti-tumor, regulating blood lipids, and improving human immunity. It has a high degree of safety and potential antibacterial properties. [0003] At present, the preparation process of high-quality chitosan in China is far behind the western developed countries, and the reports on the preparation of water-soluble chitosan a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
CPCC08B37/0003C08B37/003
Inventor 丁振中张超邓红兵曾哲灵张家宏寇祥明张万宏
Owner YANGZHOU RIXING BIO TECH
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