Antibacterial activities of Adina rubella extract enhanced by fermentation and its application in packaging films

Food spoilage caused by pathogens pose great threat to food safety and human health. Plastarch-based packaging films with antibacterial activities provide an effective way to control foodborne pathogens. In this study, microbial fermentation dominated by yeast was used for the first time to increase the antibacterial activity of Adina rubella extract (ARE). The best antimicrobial effect of ARE was observed by fermentation for 9 days. The minimum inhibitory concentration of ARE against Listeria monocytogenes was 3.125 mg/mL. ARE destroyed the structure of the cell wall, increased the permeability of the cell membrane, led to the leakage of nucleic acids, and induced the change of ROS level, which caused cell death of Listeria monocytogenes. ARE-based biodegradable films were prepared and their performance in pork packaging application was evaluated. The films showed effective antimicrobial properties and showed great potential for the development of safe and sustainable food packaging films.