Antibiotic composite membrane of nano-silk fibroin-chitosan-nano-silver
A nano-silk fibroin and nano-silver antibacterial technology, applied in the field of antibacterial materials and nanomaterials, can solve the problems of strong permeability and migration, hidden dangers, easy failure, health and safety, etc., and achieve high antibacterial activity, long-lasting efficacy, and energy-saving effects. Good results
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[0020] Example 1 A nano-silk fibroin-chitosan-nano silver antibacterial composite film
[0021] Nano-silk fibroin and chitosan are used to reduce silver nitrate in situ to prepare nano-silver, and the nano-silk fibroin-nano-silver antibacterial composite film is further prepared. The specific steps are as follows:
[0022] (1) Prepare an aqueous solution of nano-silk fibroin with a mass concentration of 0.5% and a chitosan aqueous solution with a mass concentration of 10%, add sodium hydroxide dropwise under stirring, and adjust the pH of the solution to 7;
[0023] (2) Under stirring, add silver nitrate to the solution obtained in step (1) to obtain a mixed solution with a silver nitrate concentration of 20 mmol / L, and continue stirring for 30 minutes;
[0024] (3) Expose the mixed solution obtained in step (2) to light for 12 h to obtain a uniform nano silk fibroin, chitosan, and nano silver mixed solution;
[0025] (4) Add the mixed solution obtained in step (3) to the nanosilk fibro...
Example Embodiment
[0026] Example 2 A nano-silk fibroin-chitosan-nano silver antibacterial composite film
[0027] Nano-silk fibroin and chitosan are used to reduce silver nitrate in situ to prepare nano-silver, and the nano-silk fibroin-nano-silver antibacterial composite film is further prepared. The specific steps are as follows:
[0028] (1) Prepare an aqueous solution of nano-silk fibroin with a mass concentration of 3% and a chitosan aqueous solution with a mass concentration of 8.5%, add sodium hydroxide dropwise under stirring, and adjust the pH of the solution to 7;
[0029] (2) Under stirring, add silver nitrate to the solution obtained in step (1) to obtain a mixed solution with a silver nitrate concentration of 45 mmol / L, and continue stirring for 30 minutes;
[0030] (3) Expose the mixed solution obtained in step (2) to light for 15 hours to obtain a uniform nano silk fibroin, chitosan, and nano silver mixed solution;
[0031] (4) Add the mixed solution obtained in step (3) to the nanosilk fi...
Example Embodiment
[0032] Example 3 A nano-silk fibroin-chitosan-nano silver antibacterial composite film
[0033] Nano-silk fibroin and chitosan are used to reduce silver nitrate in situ to prepare nano-silver, and the nano-silk fibroin-nano-silver antibacterial composite film is further prepared. The specific steps are as follows:
[0034] (1) Prepare an aqueous solution of nano-silk fibroin with a mass concentration of 2% and an aqueous solution of chitosan with a mass concentration of 9.2%, add sodium hydroxide dropwise with stirring, and adjust the pH of the solution to 8;
[0035] (2) Under stirring, add silver nitrate to the solution obtained in step (1) to obtain a mixed solution with a silver nitrate concentration of 40 mmol / L, and continue stirring for 30 minutes;
[0036] (3) Expose the mixed solution obtained in step (2) to light for 20 hours to obtain a uniform nano silk fibroin, chitosan, and nano silver mixed solution;
[0037] (4) Add the mixed solution obtained in step (3) to the nano-sil...
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