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Development of antimicrobial films based on poly(lactic acid) incorporated with Thymus vulgaris essential oil and ethanolic extract of Mediterranean propolis

Ardjoum, Nadjat, Chibani, Nacera, Shankar, Shiv, Ben Fadhel, Yosra, Djidjelli, Hocine et Lacroix, Monique ORCID: https://orcid.org/0000-0002-2042-4033 (2021). Development of antimicrobial films based on poly(lactic acid) incorporated with Thymus vulgaris essential oil and ethanolic extract of Mediterranean propolis International Journal of Biological Macromolecules , vol. 185 . p. 535-542. DOI: 10.1016/j.ijbiomac.2021.06.194.

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Résumé

Antimicrobial films based on polylactic acid (PLA) were developed by incorporating Thymus vulgaris essential oil (TV-EOs) with different concentrations of ethanolic extract of Mediterranean propolis (EEP) (5 wt% and 10 wt% based on PLA). The antimicrobial activities of EEP were performed by the agar disc diffusion method. The EEP exhibited high antimicrobial properties with inhibition zone diameter of 12.1 and 11.58 mm against Staphylococcus aureus and Penicillium sp., respectively. The addition of TV-EOs to films containing 5 and 10 wt% of EEP decrease the elastic modulus from 1292 MPa to 1084 MPa and 911.1 MPa to 794 MPa compared with films containing 5 and 10% of EEP alone, respectively. However, the elongation at break increased by 64% after the addition of TV-EOs to the film containing 10 wt% of EEP. Thermal stability of films improvement by the addition of TV-EOs and EEP. Antimicrobial activity of the films showed that films containing 10 wt% EEP inhibited the growth of Candida albicans and the combination of EEP and TV-EOs in the PLA matrix showed a synergistic effect against Escherichia coli. The developed PLA-based films with antimicrobial activity have a potential application in food packaging to increase the shelf life of packaged food. © 2021

Type de document: Article
Mots-clés libres: Polylactic Acid; Antimicrobial Film; Essential Oil; Thymus Vulgaris; Propolis
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 22 juin 2022 19:07
Dernière modification: 22 juin 2022 19:07
URI: https://espace.inrs.ca/id/eprint/12282

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