Preparation method of controllably degraded O-carboxymethyl cinnamaldehyde-modified chitosan antibacterial film
A technology of carboxymethyl chitosan and carboxymethyl meat, which is applied in the field of preparation of controllable degradation of O-carboxymethyl cinnamaldehyde modified chitosan antibacterial film, can solve the uncontrollable degradation rate and the inability to prepare film materials , complex production process and other issues, to achieve excellent application value, easy to obtain raw materials, and simple preparation methods
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[0055] Example 1
[0056] (1) Preparation of carboxymethyl chitin
[0057] 5g of chitin was swelled in 50mL of isopropanol at room temperature for 2h and then placed in an ice-salt bath at -2°C for cooling, and 30mL of 50% NaOH solution was slowly added dropwise, stirred uniformly, and swelled at -2°C for 2h. 10g of chloroacetic acid was heated and dissolved in 10mL of isopropanol in a water bath, slowly added dropwise to the chitin solution under stirring, and stirred in a water bath at 50°C for 4h. Centrifugal sedimentation, decant the supernatant, add 45 mL of distilled water, 10% hydrochloric acid solution pH to neutral, suction filtration, wash with 75% methanol, 95% ethanol, respectively, and vacuum dry for 12 hours.
[0058] (2) Preparation of O-carboxymethyl chitosan by deacetylation of carboxymethyl chitin
[0059] Take 2.5 g of the product obtained in (1), dissolve it in 50 mL of 50% NaOH solution, stir at 50°C for 1 hour, add 10 mL of deionized water, stir, filter with suc...
Example Embodiment
[0064] Example 2
[0065] (1) Preparation of carboxymethyl chitin
[0066] 5g of chitin was swelled in 45mL of isopropanol at room temperature for 3h and then placed in an ice-salt bath at -5°C to cool, and 30mL of 50% NaOH solution was slowly added dropwise, stirred uniformly, and swelled at -5°C for 2h. 9g of chloroacetic acid was heated and dissolved in 9mL of isopropanol in a water bath, slowly added dropwise to the chitin solution under stirring, and stirred in a water bath for 5 hours at 50°C. Centrifugal sedimentation, decant the supernatant, add 43mL of distilled water, 10% hydrochloric acid solution to adjust the pH to neutral, suction filtration, respectively wash with 75% methanol, 95% ethanol, and vacuum dry for 12h.
[0067] (2) Deacetylation of carboxymethyl chitin to prepare O-carboxymethyl chitosan
[0068] Take 2.5 g of the product obtained in (1), dissolve it in 50 mL of 50% NaOH solution, stir at 50°C for 1 hour, add 10 mL of deionized water, stir, filter with suct...
Example Embodiment
[0073] Example 3
[0074] (1) Preparation of carboxymethyl chitin
[0075] 5g of chitin was swelled in 50mL of isopropanol at room temperature for 2h and then placed in an ice-salt bath at -3°C for cooling, and 30mL of 50% NaOH solution was slowly added dropwise, stirred uniformly, and swelled at -3°C for 1h. 8g of chloroacetic acid was heated and dissolved in 8mL of isopropanol in a water bath, slowly added dropwise to the chitin solution under stirring, and stirred in a water bath for 4.5 hours at 50°C. Centrifugal sedimentation, decant the supernatant, add 41 mL of distilled water, 10% hydrochloric acid solution to adjust the pH to neutral, suction filtration, wash with 75% methanol, 85% ethanol, respectively, and vacuum dry for 12 hours.
[0076] (2) Deacetylation of carboxymethyl chitin to prepare O-carboxymethyl chitosan
[0077] Take 2.5g of the product obtained in (1), dissolve it in 50mL of 50% NaOH solution, stir at 50℃ for 2h, add 10mL of deionized water, stir, filter with...
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