title: Synergistic effect of gamma (γ)-irradiation and microencapsulated antimicrobials against Listeria monocytogenes on ready-to-eat (RTE) meat.
abstract: Oregano essential oil (Origanum compactum; 250 μg/ml), cinnamon essential oil (Cinnamomum cassia; 250 μg/ml) and nisin (16 μg/ml) were used alone or in combination to evaluate their efficiency to inhibit the growth of Listeria monocytogenes on RTE ham. Microencapsulation of the antimicrobial formulations was done to verify the potential effect of the polymer to protect the antimicrobial efficiency during storage. Combined treatments of antimicrobial formulation with γ-irradiation were done to verify the synergistic effect against L. monocytogenes. Microencapsulation of essential oils-nisin and γ-irradiation treatment in combination showed synergistic antimicrobial effect during storage on RTE meat products. Microencapsulated cinnamon and nisin in combination with γ-irradiation (at 1.5 kGy) showed 0.03 ln CFU/g/day growth rate of L. monocytogenes whereas the growth rate of non-microencapsulated cinnamon and nisin in combination with γ-irradiation was 0.17 ln CFU/g/day. Microencapsulation significantly (P ≤ 0.05) improved the radiosensitivity of L. monocytogenes. Microencapsulated oregano and cinnamon essential oil in combination with nisin showed the highest bacterial radiosensitization 2.89 and 5, respectively, compared to the control.
authors.affiliation: Research Laboratories in Sciences Applied to Food, Canadian Irradiation Centre (CIC), INRS-Institut Armand-Frappier, University of Quebec, 531 Boulevard des Prairies, Laval, Québec H7V 1B7, Canada.
authors.forename: Tanzina
authors.initials: T
authors.lastname: Huq
authors.affiliation: Research Laboratories in Sciences Applied to Food, Canadian Irradiation Centre (CIC), INRS-Institut Armand-Frappier, University of Quebec, 531 Boulevard des Prairies, Laval, Québec H7V 1B7, Canada.
authors.forename: Khanh Dang
authors.initials: KD
authors.lastname: Vu
authors.affiliation: Département des sciences du bois et de la forêt, Faculté de foresterie, géographie et géomatique, Université Laval, Québec G1V 0A6, Canada.
authors.forename: Bernard
authors.initials: B
authors.lastname: Riedl
authors.affiliation: FPInnovations, 570 Boulevard St. Jean, Pointe-Claire, Québec H9R 3J9, Canada.
authors.forename: Jean
authors.initials: J
authors.lastname: Bouchard
authors.affiliation: Research Laboratories in Sciences Applied to Food, Canadian Irradiation Centre (CIC), INRS-Institut Armand-Frappier, University of Quebec, 531 Boulevard des Prairies, Laval, Québec H7V 1B7, Canada. Electronic address: monique.lacroix@iaf.inrs.ca.
authors.forename: Monique
authors.initials: M
authors.lastname: Lacroix
mesh_terms: D000818:Animals; D027424:Cinnamomum / Q000737:chemistry; D057140:Fast Foods / Q000382:microbiology*; D005514:Food Irradiation / Q000379:methods; D005519:Food Preservation / Q000379:methods*; D005520:Food Preservatives / Q000494:pharmacology*; D005720:Gamma Rays; D008089:Listeria monocytogenes / Q000187:drug effects* / Q000254:growth & development / Q000528:radiation effects*; D008461:Meat Products / Q000382:microbiology*; D009561:Nisin / Q000494:pharmacology; D009822:Oils, Volatile / Q000494:pharmacology; D031341:Origanum / Q000737:chemistry; D013552:Swine
chemical_list: D005520:Food Preservatives; D009822:Oils, Volatile; D009561:Nisin
keywords: Essential oils; Gamma irradiation; Growth rate; Listeria monocytogenes; Microencapsulation; Nisin