Preparation and Application of Chitosan/Silver Nano-Activated Aerogel
Report the preparation and application of chitosan/silver nanoparticle-activated aerogels(CS/AgNP aerogels)with excellent mechanical properties and biodegradability.Chitosan is utilized as the matrix in this study,and reinforcement and cross-linking agents are added to improve the performance of the aerogels.The CS/AgNP aerogels are prepared by the following steps:Silver nanoparticles(AgNPs)are synthesized by heating a mixture of chitosan solution(8-12 g/L)and AgNO3 solution(0.008-0.012 mol/L)at 40-60 ℃ for 0.5-2 h;Bacterial cellulose(BC)and citric acid(CA)are added as the reinforcement and cross-linking agents,respectively,with the mass ratios of AgNPs∶BC∶CA being 100∶(0.02-0.3)∶(0.062 5-1);The study demonstrates that the in situ immobilization of AgNPs reduces the release of AgNPs from the composite aerogel material,and thus prolongs the shelf-life of cold meat.The CS/AgNP aerogels exhibit high efficiency in inhibiting bacterial growth,as well as good biodegradability,low cost,and easy preparation.Therefore,the CS/AgNP aerogels are suitable for widespread use in fresh meat packaging.
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