Abstract
The objective of this study was to propose the development of antimicrobial packaging films based on polylactic acid and sophorolipid produced by Starmerella bombicola for the control of foodborne pathogens. Films were produced by the casting method, and five formulations were prepared with different proportions of polylactic acid:sophorolipid: 100:0, 97.5:2.5, 95:5, 90:10 and 80:20. The addition of sophorolipid resulted in porous matrix films, and evident changes were observed, suggesting a chemical interaction between the biopolymer and the biosurfactant. The films showed good thermal stability, and the sophorolipid had a plasticizing effect, modifying the mechanical properties and improving the elasticity and flexibility. The films exhibited antimicrobial activity against the poultry pathogens Listeria monocytogenes, Staphylococcus aureus and Salmonella spp. Sophorolipid can be incorporated as a multifunctional agent in films, being used to improve thermomechanical properties and as a natural antimicrobial for the control of foodborne pathogens in the food industry.
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