Inhibition of Salmonella Enterica and Listeria Monocytogenes in Tofu by Activated Plastic Films

Abstract

Transmission of food borne pathogens through the food chain is a matter of concern. In the present study, tofu sausage slices were used as model for testing the antimicrobial activity of low-density polyethylene (LDPE) films surface-activated with tyrosol singly or in combination with p-hydroxybenzoic acid or a bacteriocin preparation from Enterococcus faecalis. Tofu slices challenged with cocktails of Listeria monocytogenes and Salmonella enterica strains were vacuum packaged in LDPE films activated with antimicrobials and stored at 10 ºC for one month. Best results against the two foodborne pathogens tested were obtained when tyrosol (1.5%) was used in combination with p-hydroxybenzoic acid (0.5%). Results from the present study highlight the potential of tyrosol for development of active packaging with antibacterial activity.