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Method for rapidly preparing amphipathic soluble chitosan

A chitosan, acid-base technology, applied in the field of preparation of acid-base amphoteric soluble chitosan, can solve the problems of cumbersome preparation process, long consumption, high cost, etc., and achieve the effect of simple and easy-to-obtain raw materials and wide application prospects

Inactive Publication Date: 2011-02-16
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method of preparing acid-base amphoteric soluble chitosan requires a variety of raw materials, multi-step reactions, and takes a long time to complete (15-40h), the preparation process is very cumbersome and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Dispersing the chitin powder with a molecular weight of 1.2 million in a sodium hydroxide solution with a mass concentration of 50%, chitosan: the weight ratio of the sodium hydroxide solution is 40:100, and mix evenly;

[0019] 2) Place the homogeneously mixed blend in the working tank of the ultrasonic instrument for ultrasonic treatment, ultrasonic frequency: 50kHz, water bath temperature: 95°C, ultrasonic time: 30min;

[0020] 3) Repeatedly washing and filtering the treated mixture with distilled water to obtain a powdery or flaky filter residue after filtering;

[0021] 4) Drying the filtered filter residue powder to obtain amphoteric-soluble chitosan.

[0022] The chitosan obtained above can be dissolved in the acid solution with pH ≤ 3, and can also be dissolved in the alkali solution with pH ≥ 12.

Embodiment 2

[0024] 1) The chitin powder with a molecular weight of 2,000,000 is dispersed in a potassium hydroxide solution with a mass concentration of 80%, and the chitosan: the weight ratio of the potassium hydroxide solution is 25:100, and the mixture is homogeneous;

[0025] 2) Place the homogeneously mixed blend in the working tank of the ultrasonic instrument for ultrasonic treatment, ultrasonic frequency: 85kHz, water bath temperature: 80°C, ultrasonic time: 90min;

[0026] 3) Repeatedly washing and filtering the treated mixture with distilled water to obtain a powdery or flaky filter residue after filtering;

[0027] 4) Drying the filtered filter residue powder to obtain amphoteric-soluble chitosan.

[0028] The chitosan obtained above can be dissolved in the acid solution with pH ≤ 3, and can also be dissolved in the alkali solution with pH ≥ 12.

Embodiment 3

[0030] 1) Disperse chitin powder with a molecular weight of 800,000 in a sodium hydroxide solution with a mass concentration of 25%, stir to form a transparent solution, chitosan: the weight ratio of sodium hydroxide aqueous solution is 10:100, and mix uniformly;

[0031] 2) Place the homogeneously mixed blend in the working tank of the ultrasonic instrument for ultrasonic treatment, ultrasonic frequency: 99kHz, water bath temperature: 40°C, ultrasonic time: 120min;

[0032] 3) Wash and filter the treated mixture repeatedly with distilled water, and obtain powdery or flaky filter residue after filtering;

[0033] 4) Drying the filtered filter residue powder to obtain amphoteric-soluble chitosan.

[0034] The obtained chitosan can be dissolved in the acid solution with pH ≤ 3, and can also be dissolved in the alkali solution with pH ≥ 12.

[0035] Applying the above-mentioned process method to produce acid-base amphoteric soluble chitosan, because the selected chitin raw mater...

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Abstract

The invention relates to a method for rapidly preparing amphipathic soluble chitosan. The method is characterized by comprising the following steps of: performing ultrasonic processing on chitosan dispersed in concentrated alkaline solution by using ultrasonic wave to obtain a mixture; and repeatedly washing the obtained mixture by using distilled water, and filtering and drying to obtain the amphipathic soluble chitosan. In the method, the amphipathic soluble chitosan can be rapidly prepared in a short time (2 to 4 h), the used raw materials are simple and can be obtained easily, and the defects of various raw materials, multistep reaction, longer time (15 to 40 h), complex preparation process and higher cost of the conventional method for preparing the amphipathic soluble chitosan are overcome. The method has wide application prospect in the aspects of preparing the amphipathic soluble chitosan and forming the chitosan.

Description

technical field [0001] The invention relates to a method for preparing acid-base amphoteric soluble chitosan, in particular to a method for rapidly preparing acid-base amphoteric soluble chitosan. Background technique [0002] Chitosan is the only alkaline polysaccharide in nature. It is an environmentally friendly and renewable green resource. It has good biocompatibility, biodegradability, and has the characteristics of non-toxic, moisturizing, breathable, antibacterial and mothproof. It can be widely used in Medical, health care textiles, food and environmental protection and many other aspects. However, there are strong hydrogen bonds between chitosan molecules, so that it can only be processed by solution method. The commonly used processing method is to dissolve chitosan in dilute acid first, and then form it in alkali. However, the β(1→4) glycosidic bond of chitosan is very unstable in acid and easily degraded, resulting in poor mechanical properties of processed ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 樊敏胡巧玲
Owner SHANGHAI OCEAN UNIV
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