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Antibacterial and physical effects of modified chitosan based-coating containing nanoemulsion of mandarin essential oil and three non-thermal treatments against Listeria innocua in green beans

Severino, Renato; Vu, Khanh Dang; Donsì, Francesco; Salmieri, Stéphane; Ferrari, Giovanna; Lacroix, Monique (2014). Antibacterial and physical effects of modified chitosan based-coating containing nanoemulsion of mandarin essential oil and three non-thermal treatments against Listeria innocua in green beans International Journal of Food Microbiology , vol. 191 . p. 82-88. DOI: 10.1016/j.ijfoodmicro.2014.09.007.

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Résumé

The antimicrobial activity against Listeria innocua of three different combined non-thermal treatments, along with the impact on color and texture on green bean samples, was evaluated. In this study a bioactive coating formulation based on modified chitosan containing 0.05% nanoemulsion of mandarin essential oil was tested in combination with γ-irradiation, UV-C and ozonated water treatments, and the results in terms of antimicrobial activity, color and texture changes, were evaluated during 14. days storage. The combined coating and γ-irradiation treatment gave promising results, showing 3.3 log CFU/g initial microbial reduction, and exhibiting a strong synergistic antimicrobial effect. The treatment based on UV-C and coating formulation allowed a 3 log CFU/g reduction of initial L. innocua population on samples, showing a good residual antimicrobial activity and preventing loss of firmness and color changes during storage. The combined treatment of coating and ozonated water did not show any synergistic or additive antimicrobial effect, but they showed an impact on firmness and color. In conclusion UV-C and γ-irradiation treatments, in combination with the bioactive coating, represent an effective approach to control the growth of L. innocua on vegetable foods.

Type de document:
Mots-clés libres: Antimicrobial coating; Listeria innocua; Nanoemulsion of mandarin oil; Ozonated water; UV-C; γ-Irradiation
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 23 juin 2017 05:07
Dernière modification: 23 juin 2017 05:07
URI: http://espace.inrs.ca/id/eprint/3112

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