{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T03:12:58Z","timestamp":1792033978033,"version":"4.4.0"},"reference-count":69,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2021,7,26]],"date-time":"2021-07-26T00:00:00Z","timestamp":1627257600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Here we introduce a new method aiming the immobilization of bioactive principles onto polymeric substrates, combining a surface activation and emulsion entrapment approach. Natural products with antimicrobial\/antioxidant properties (essential oil from Syzygium aromaticum\u2014clove and vegetal oil from Argania spinosa L\u2014argan) were stabilized in emulsions with chitosan, a natural biodegradable polymer that has antimicrobial activity. The emulsions were laid on poly(lactic acid) (PLA), a synthetic biodegradable plastic from renewable resources, which was previously activated by plasma treatment. Bioactive materials were obtained, with low permeability for oxygen, high radical scavenging activity and strong inhibition of growth for Listeria monocytogenes, Salmonella Typhimurium and Escherichia coli bacteria. Clove oil was better dispersed in a more stable emulsion (no separation after six months) compared with argan oil. This leads to a compact and finely structured coating, with better overall properties. While both clove and argan oils are highly hydrophobic, the coatings showed increased hydrophilicity, especially for argan, due to preferential interactions with different functional groups in chitosan. The PLA films coated with oil-loaded chitosan showed promising results in retarding the food spoilage of meat, and especially cheese. Argan, and in particular, clove oil offered good UV protection, suitable for sterilization purposes. Therefore, using the emulsion stabilization of bioactive principles and immobilization onto plasma activated polymeric surfaces we obtained a bioactive material that combines the physical properties and the biodegradability of PLA with the antibacterial activity of chitosan and the antioxidant function of vegetal oils. This prevents microbial growth and food oxidation and could open new perspectives in the field of food packaging materials.<\/jats:p>","DOI":"10.3390\/molecules26154500","type":"journal-article","created":{"date-parts":[[2021,7,26]],"date-time":"2021-07-26T09:25:52Z","timestamp":1627291552000},"page":"4500","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":67,"title":["Towards a Bioactive Food Packaging: Poly(Lactic Acid) Surface Functionalized by Chitosan Coating Embedding Clove and Argan Oils"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1409-9913","authenticated-orcid":false,"given":"Elena","family":"Stoleru","sequence":"first","affiliation":[{"name":"Physical Chemistry of Polymers Department, \u201cPetru Poni\u201d Institute of Macromolecular Chemistry, 41A Gr. Ghica Voda Alley, 700487 Ia\u015fi, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1854-0278","authenticated-orcid":false,"given":"Cornelia","family":"Vasile","sequence":"additional","affiliation":[{"name":"Physical Chemistry of Polymers Department, \u201cPetru Poni\u201d Institute of Macromolecular Chemistry, 41A Gr. Ghica Voda Alley, 700487 Ia\u015fi, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anamaria","family":"Irimia","sequence":"additional","affiliation":[{"name":"Physical Chemistry of Polymers Department, \u201cPetru Poni\u201d Institute of Macromolecular Chemistry, 41A Gr. Ghica Voda Alley, 700487 Ia\u015fi, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2246-0510","authenticated-orcid":false,"given":"Mihai","family":"Brebu","sequence":"additional","affiliation":[{"name":"Physical Chemistry of Polymers Department, \u201cPetru Poni\u201d Institute of Macromolecular Chemistry, 41A Gr. Ghica Voda Alley, 700487 Ia\u015fi, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,26]]},"reference":[{"key":"ref_1","first-page":"60","article-title":"The development and challenges of poly (lactic acid) and poly (glycolic acid)","volume":"3","author":"Jem","year":"2020","journal-title":"Adv. Ind. Eng. Polym. 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