The preparation, characterization and antibacterial properties of chitosan/pectin silver nanoparticle films

Abstract

Edible film production from natural biodegradable polymers that will not cause environmental waste problems has been increasing in recent years. Antibacterial materials can be added to these films to increase the shelf life and quality of products. In this work, chitosan-based and chitosan/pectin-based silver nanoparticle films which has eco-friendly and antibacterial properties were synthesized. The morphological test of the prepared films was performed by scanning electron microscope and transmission electron microscope. The presence of silver element was detected by energy-dispersive X-ray. Thermal analysis was tested with thermogravimetric analysis and differential scanning calorimeter analyzer. The crystallinity (%) of films was determined with X-ray diffraction analyzer. The presence of pectin increased the thermal stability and crystallinity%. The mechanical tests were examined with Zwick universal testing machine and the content of pectin improved the mechanical properties of film. The antibacterial test was done toward Gram-negative bacteria (Escherichia coli). Chitosan/pectin-based films compared with chitosan-based film displayed long-lasting antibacterial activity against E.coli.