Efficacy of antimicrobial properties of polylactide/cinnamon oil film with and without high-pressure treatment against Listeria monocytogenes and Salmonella typhimurium inoculated in chicken sample

Antimicrobial solvent casted polylactide/polyethylene glycol/cinnamon oil (PLA/PEG/CIN) films were developed for food packaging Chicken samples were packed with those films, and stored at 4 °C for 20 days. The efficacy of inhibiting total viable counts (TVC), lactic acid bacteria (LAB), Pseudomonas spp and total coliforms were evaluated, and found that those counts were reduced by one log CFU/g during the storage period. The PLA/PEG/CIN film was also evaluated by performing a challenge test against the growth of L. monocytogenes and S. typhimurium in chicken sample at 4 °C for 17 days. The challenge tests indicated that the film was capable to inhibit the growth of L. monocytogenes and S. typhimurium up to 17 days at 4 °C. Additionally, the effect of high-pressure (HP) treatment (150, 200 and 250 MPa for 10 min) on survival of L. monocytogenes inoculated with chicken sample and packed in the PLA/PEG/CIN films was examined. A synergistic antimicrobial activity was observed between HP-treatment and the developed film. The counts of L. monocytogenes were found below the detection limit at the end of the storage at 4 °C for 26 days. The obtained results indicated that the use of mild pressure treatment and application of antimicrobial PLA/PEG/CIN packaging could be useful techniques for controlling the growth of L. monocytogenes in chicken samples.