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Antifungal activities of combined treatments of irradiation and essential oils (EOs) encapsulated chitosan nanocomposite films in in vitro and in situ conditions

Hossain, Farah; Follett, Peter; Salmieri, Stéphane; Vu, Khanh Dang; Fraschini, Carole; Lacroix, Monique (2019). Antifungal activities of combined treatments of irradiation and essential oils (EOs) encapsulated chitosan nanocomposite films in in vitro and in situ conditions International Journal of Food Microbiology , vol. 295 . p. 33-40. DOI: 10.1016/j.ijfoodmicro.2019.02.009.

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Résumé

Cellulose nanocrystals (CNCs) reinforced chitosan based antifungal films were prepared by encapsulating essential oils (EOs) nanoemulsion. Vapor phase assays of the chitosan-based nanocomposite films loaded with thyme-oregano, thyme-tea tree and thyme-peppermint EO mixtures showed significant antifungal activity against Aspergillus niger, Aspergillus flavus, Aspergillus parasiticus, and Penicillium chrysogenum, reducing their growth by 51-77%. Combining the bioactive chitosan films loaded with thyme and oregano EOs produced ~2 log reduction in fungal growth in inoculated rice during 8 weeks of storage at 28 °C. The bioactive films showed a slow release (26%) of volatile components over 12 weeks of storage. Sensorial evaluation of rice samples packed with the bioactive films showed no significant change in odor, taste, color and general appreciation compared with untreated rice. Incorporation of cellulose nanocrystals (CNCs) with the chitosan matrix played an important role in stabilizing the physicochemical and release properties of the nanocomposite films. In addition, combining the bioactive chitosan films with a dose of 750 Gy of ionizing radiation showed significantly higher antifungal and mechanical properties than treatment with the bioactive film or irradiation alone.

Type de document: Article
Mots-clés libres: Active packaging; Antifungal activity; Nanoemulsion; Release of volatile components; γ radiation
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 04 août 2019 15:35
Dernière modification: 04 août 2019 15:35
URI: http://espace.inrs.ca/id/eprint/8126

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