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Combined effect of antimicrobial coatings, gamma radiation and negative air ionization with ozone on Listeria innocua, Escherichia coli and mesophilic bacteria on ready-to-eat cauliflower florets

Boumail, Afia; Salmieri, Stéphane; Lacroix, Monique (2016). Combined effect of antimicrobial coatings, gamma radiation and negative air ionization with ozone on Listeria innocua, Escherichia coli and mesophilic bacteria on ready-to-eat cauliflower florets Postharvest Biology and Technology , vol. 118 . p. 134-140. DOI: 10.1016/j.postharvbio.2016.04.005.

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Résumé

The objective of this study was to evaluate the effect of a bioactive edible coating combined with a low γ-radiation dose or negative air ionization (NAI) with ozone on the microbiological quality of ready-to-eat cauliflowers. Results showed that each treatment alone was effective on Listeria innocua, Escherichia coli and mesophilic bacteria. After 7 d, treatment with γ-radiation reduced L. innocua and E. coli of 1.8 and 3.6 log CFU g-1 respectively while NAI + ozone reduced L. innocua and E. coli of 2.0 and 2.8 log CFU g-1 respectively. Mesophilic bacteria were reduced of 1.8 log CFU g-1 after γ-radiation and 1.4 log CFU g-1 after NAI + ozone. This study demonstrated that the bioactive coating acts in synergy with γ-radiation, inducing no bacterial growth of L. innocua and E. coli, as well as a control of the growth of mesophilic bacteria during 7 d. The combination of bioactive coating and NAI + ozone induced an additive effect on L. innocua, E. coli and mesophilic bacteria, and suggests potential antioxidant properties of the coating.

Type de document:
Mots-clés libres: Antimicrobial coating; E. coli; Gamma radiation; Listeria; Negative air ionization; Ozone
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 19 juin 2017 19:26
Dernière modification: 19 juin 2017 19:26
URI: http://espace.inrs.ca/id/eprint/4562

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