A preparation method of silver-loaded modified bacterial cellulose-based composite functional wet dressing
A bacterial cellulose and modified technology, applied in medical science, bandages, absorbent pads, etc., can solve the problems of film surface slippage, weak interaction between nanoparticles and bacterial cellulose film, human harm, etc., and achieve excellent antibacterial properties. Effect
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Embodiment 1
[0043] (1) the bacterial cellulose produced by Acetobacter xylinum is placed in a freeze dryer and freeze-dried for 24 hours;
[0044] (2) the bacterial cellulose after freeze-drying is immersed in the aqueous solution containing 0.01mol / L 2,2,5,5-tetramethylpiperidine-N-oxyl and 0.01mol / L horseradish peroxidase, The mass-volume concentration of described bacterial cellulose in described aqueous solution is 2g / L, and with the HNO of 1mol / L 3 The solution adjusts the pH of the above aqueous solution to be 2;
[0045] (3) within 1 hour, gradually add dropwise the hypochlorous acid solution of 1mol / L to make the reaction, the amount added dropwise is one-tenth of the volume of the aqueous solution by volume, and the reaction temperature is 100°C;
[0046] (4) The bacterial cellulose treated in the previous step is taken out, washed 5 times with distilled water, and then washed 5 times with ethanol until its pH value is 7, and the selective oxidation of bacterial cellulose is obt...
Embodiment 2
[0054] (1) Place the bacterial cellulose produced by Acetobacter acetogenes in a lyophilizer and freeze-dry for 24 hours;
[0055] (2) The bacterial cellulose after freeze-drying is immersed in the aqueous solution containing 0.1mol / L 4-methyl-TEMPO and 0.1mol / L bean hull peroxidase, the quality of the bacterial cellulose in the aqueous solution -The volume concentration is 5g / L, and the pH value of the above-mentioned aqueous solution is adjusted to 3 with the HCl solution of 5mol / L;
[0056] (3) Gradually drop the hypochlorite solution of 2mol / L in 2 hours to make the reaction, the dripping amount is one-tenth of the volume of the aqueous solution by volume, and the reaction temperature is 20°C;
[0057] (4) The bacterial cellulose treated in the previous step is taken out, washed 3 times with distilled water, and then washed 3 times with ethanol until its pH value is 6, and the selective oxidation of bacterial cellulose is obtained;
[0058] (5) Add the above-mentioned sel...
Embodiment 3
[0065] (1) the bacterial cellulose produced by Acetobacter is placed in a freeze dryer and freeze-dried for 24 hours;
[0066] (2) The bacterial cellulose after freeze-drying is immersed in the aqueous solution containing 0.51mol / L 4-hydroxyl-TEMPO and 0.5mol / L myeloperoxidase, the mass-volume of described bacterial cellulose in described aqueous solution Concentration 10g / L, and use 5mol / L HNO 3 The solution adjusts the pH value of the above aqueous solution to 4, and the reaction temperature is 90°C;
[0067] (3) within 3 hours, the chlorous acid solution of 5mol / L was gradually added dropwise to make the reaction, and the amount of addition was one-tenth of the volume of the aqueous solution by volume;
[0068] (4) The bacterial cellulose treated in the previous step is taken out, washed 5 times with distilled water, and then washed 3 times with ethanol until its pH value is 6, and the selective oxidation of bacterial cellulose is obtained;
[0069] (5) The above-mentione...
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