Created food-grade antibacterial film (2 photos)

Extending the shelf life of food andensuring the protection of humans from bacterial diseases has become one of the priority tasks for a group of scientists from the University of Pennsylvania (USA) who created a special plastic film equipped with an antibacterial coating.

New technology is based on the use ofPullulan, one of the ingredients of which is the natural antibiotic lauric arginate. Both the basic substance pullulan and its component - lauric arginate are certified for use in the food industry.

The main task of the researchers was to createcomposite material from a plastic film and pullulan, while preserving all the chemical and physical properties of both substances. For a plastic film, it is necessary to leave such physical characteristics as transparency, strength and water resistance, and pullulan is required to maintain antibacterial properties.

Given that both materials react to water, the inventors, when creating an adhesive joint, had to dwell on the option with a one-sided antibacterial layer.

During testing of the resulting filmsuch foods as raw beef, raw chicken breast and cooked turkey breast were used. The products were wrapped in a created antibacterial film and placed in the refrigerator for 28 days, after which they were infected with the poisonous bacteria E. coli, Salmonella spp., Listeria monocytogenes and Staphylococcus aureus.

Upon completion of the experiment, it was revealed thatthe density of bacteria preserved after four-week storage has decreased significantly. Calculations of quantitative results continue, but it is already safe to say that the new film will be able to provide reliable and long-term storage of food products.

Source: psu