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Method for preparing carboxymethyl chitosan film through dialysis and application of carboxymethyl chitosan film

A carboxymethyl chitosan and film technology, applied in the field of carboxymethyl chitosan film and its preparation, can solve problems such as instability, and achieve the effects of low cost, cost saving and simplified procedure

Inactive Publication Date: 2016-10-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carboxymethyl chitosan film directly prepared by the method of solvent volatilization will dissolve in water and is unstable, thus limiting its application to a certain extent.

Method used

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  • Method for preparing carboxymethyl chitosan film through dialysis and application of carboxymethyl chitosan film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, first put about 2% carboxymethyl chitosan solution into the dialysis bag, put the dialysis bag into clean water for dialysis, dialyze in water until it is about neutral, and then put the dialysis bag into the pH value of about Carboxymethyl chitosan film was obtained by dialysis in acetic acid solution of 4.

[0046] Weigh 0.4g carboxymethyl chitosan and dissolve it in 19.6g water, stir overnight to prepare 2% carboxymethyl chitosan solution. The above solution was centrifuged and degassed. The centrifugation speed is 10000r / min, and the centrifugation time is 5min; the suction filtration vacuum degree used for vacuum degassing is 0.09MPa to 0.1MPa, and the suction filtration time is 30min. After the pretreatment is completed, 15 g of carboxymethyl chitosan solution is weighed and put into a dialysis bag. The dialysis bag has a molecular weight cut-off of 8000-14000 Da and a diameter of 34 mm. Secure the closure with clips. Put the dialysi...

Embodiment 2

[0052] Weigh 0.5g carboxymethyl chitosan and dissolve it in 26.5g water, stir overnight to prepare 2% carboxymethyl chitosan solution. The above solution was centrifuged and degassed. The centrifugation speed is 8000r / min, and the centrifugation time is 10min; the suction filtration vacuum degree used for vacuum degassing is 0.09MPa to 0.1MPa, and the suction filtration time is 60min. After the pretreatment is completed, 15 g of carboxymethyl chitosan solution is weighed and put into a dialysis bag. The dialysis bag has a molecular weight cut-off of 8000-14000 Da and a diameter of 34 mm. Secure the closure with clips. Put the dialysis bag into a 1000mL beaker and dialyze with water for 3 days, changing the water every 3 hours until the pH of the dialysate is close to 7. Put the dialysis bag into 1000 mL of dilute hydrochloric acid solution with a pH of 4.05 to continue dialysis for 36 hours, and a layer of carboxymethyl chitosan film will be slowly deposited on the surface o...

Embodiment 3

[0056] Weigh 0.8g carboxymethyl chitosan and dissolve it in 31.2g water, stir overnight to prepare 2% carboxymethyl chitosan solution. The above solution was centrifuged and degassed. The centrifugation speed is 12000r / min, and the centrifugation time is 5min; the suction filtration vacuum degree used for vacuum degassing is 0.09MPa to 0.1MPa, and the suction filtration time is 20min. After the pretreatment is completed, weigh 30 g of carboxymethyl chitosan solution and put it into a dialysis bag. The molecular weight cut-off of the dialysis bag is 8000-14000 Daltons and the diameter is 34 mm. Secure the closure with clips. Put the dialysis bag into a 2000mL beaker and dialyze with water for 4 days, changing the water every 4 hours until the pH of the dialysate is close to 7. Putting the dialysis bag into 1000 mL of dilute sulfuric acid solution with a pH of 3.95 to continue dialysis for 30 hours, a carboxymethyl chitosan film will slowly deposit on the surface of the dialys...

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Abstract

The invention discloses a method for preparing a carboxymethyl chitosan film through dialysis and an application of the carboxymethyl chitosan film. The method comprises the following steps: 1) a carboxymethyl chitosan solution is poured into a dialysis bag and subjected to dialysis in water until the carboxymethyl chitosan solution is neutral; 2) the dialysis bag containing the neutral carboxymethyl chitosan solution is continuously soaked in an acid solution for dialysis and a layer of carboxymethyl chitosan film is deposited on the inner surface of the dialysis bag; 3) the carboxymethyl chitosan film obtained in the step 2) is transferred and dried. The carboxymethyl chitosan film is prepared with the dialysis bag as a template, is in the same shape as the dialysis bag and adopts a bag-shaped structure; the dialysis bag can be repeatedly used and is low in cost; the specific surface area of the prepared film is relatively large, and the carboxymethyl chitosan film can be used in fields such as selective dialysis, adsorption of heavy metal ions, dye adsorption, wastewater treatment and the like.

Description

technical field [0001] The invention relates to a carboxymethyl chitosan film and a preparation method thereof, in particular to a method for preparing a carboxymethyl chitosan film by means of dialysis and an application thereof. Background technique [0002] Chitosan is obtained by deacetylation of chitin, and has a wide range of sources. It is the second largest natural polymer in nature after cellulose. Carboxymethyl chitosan is a water-soluble chitosan derivative that dissolves in a wide range of pH solutions. It is an amphoteric polyelectrolyte that contains both carboxyl and amino groups after carboxymethyl modification of chitosan. And on the basis of maintaining the biocompatibility and biodegradability of chitosan, it also has the characteristics of film formation, antibacterial, water vapor transmission, thickening, moisturizing, emulsification and adsorption of heavy metal ions. These rich properties make carboxymethyl chitosan widely used in the fields of medi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08B37/08B01J20/30B01J20/24C02F1/28B01D15/08C02F101/20C02F101/30
CPCC08J5/18B01D15/08B01J20/24C02F1/286C02F2101/20C02F2101/308C08B37/003C08J2305/08
Inventor 郝京诚黄倩宋爱新
Owner SHANDONG UNIV
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