Chitosan-silver complex antibacterial gel as well as preparation method and preservation application thereof
A technology of chitosan and complexes, which is applied in the field of chitosan-silver antibacterial gel for grape preservation and its preparation, can solve the problems that silver ions affect the antibacterial effect and liver harm, and achieve the goal of being suitable for large-scale production, The effect of low cost and good application prospects
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Embodiment 1
[0028] Weigh 2.046g of silver nitrate into a brown light-proof centrifuge tube, add 20mL of ultrapure water to dissolve it, and use tinfoil paper to keep away from light in 50mL of brown reagent, and make 0.6mol / L silver nitrate aqueous solution as nitric acid Silver stock solution: Weigh 500 mg of chitosan, add 100 mL of ultrapure water to dissolve it, then add 1% glacial acetic acid by volume to promote the dissolution of chitosan, and prepare a 5 mg / mL chitosan stock solution solution. Weigh 160 mg of sodium hydroxide, add 20 mL of ultrapure water to dissolve it, and prepare a 0.2 mol / mL sodium hydroxide stock solution.
[0029] Take 100 μL of silver nitrate stock solution, add it to a 2.0 mL light-proof screw bottle and shake it up quickly, then add 800 μL of chitosan stock solution and 100 μL of sodium hydroxide solution to make a 2.0 mL mixed solution, shake quickly Shake well to form a clear and transparent chitosan-silver hydrogel.
[0030] Antibacterial test steps: ...
Embodiment 2
[0035] Take 100 μL of the silver nitrate stock solution in the above-mentioned Example 1, add it to a 2.0 mL screw bottle that has been washed, dried and protected from light, and quickly add 800 μL of the chitosan stock solution prepared in the same way as in Example 1, and shake it up quickly , and then add 100 μL of the same preparation method as in Example 1 and 100 μL of sodium hydroxide stock solution, and shake it up quickly. A clear and transparent chitosan-silver hydrogel can be formed.
[0036] Experimental procedure for grape preservation: fresh grapes were divided into four parts, and the grapes were treated with chitosan-silver sol with a concentration of 6.0%, chitosan solution with the same mass concentration, and silver solution with the same mass concentration. Treated as CK group. The weight loss rate, decay rate, soluble solids, titratable acid, vitamin C content and other indicators were measured every day, and photographed and recorded.
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