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Such nanoparticles are highlighted due to their low cost, antimicrobial activity, accessibility, and sustainability synthesis. Four different levels of ZnO NPs (0, 0.5, 1.0, and 2.0% w\/w of chitosan) were tested, and the bionanocomposites were characterized in terms of their hydrophobicity, mechanical, optical, and barrier properties. Overall, the incorporation of ZnO NPs changed the composites from brittle to ductile, with enhanced elongation at break and reduced Young Modulus and tensile strength. Thus, ZnO NPs acted as plasticizer, turning the films more flexible, due to the presence of organic compounds on the NPs. This also favored permeability of oxygen and of water vapor, but the good barrier properties were maintained. Optical properties did not change statistically with the ZnO NPs incorporation. Thus, the characterization presented in this paper may contribute to support a decision on the choice of the material\u2019s final application.<\/jats:p>","DOI":"10.3390\/coatings11060646","type":"journal-article","created":{"date-parts":[[2021,5,27]],"date-time":"2021-05-27T23:16:46Z","timestamp":1622157406000},"page":"646","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":50,"title":["Biodegradable Chitosan Films with ZnO Nanoparticles Synthesized Using Food Industry By-Products\u2014Production and Characterization"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8381-9780","authenticated-orcid":false,"given":"Victor","family":"Souza","sequence":"first","affiliation":[{"name":"MEtRICs, Departamento de Ci\u00eancias e Tecnologia da Biomassa, NOVA School of Science and Technology|FCT NOVA, Campus de Caparica, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9679-4022","authenticated-orcid":false,"given":"Marta","family":"Alves","sequence":"additional","affiliation":[{"name":"CQE Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8567-0032","authenticated-orcid":false,"given":"Catarina","family":"Santos","sequence":"additional","affiliation":[{"name":"CQE Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"},{"name":"EST Set\u00fabal, CDP2T, Instituto Polit\u00e9cnico de Set\u00fabal, Campus IPS, 2910 Set\u00fabal, Portugal"}]},{"given":"Isabel","family":"Ribeiro","sequence":"additional","affiliation":[{"name":"Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Prof. Gama Pinto, 1649-003 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8136-3385","authenticated-orcid":false,"given":"Carolina","family":"Rodrigues","sequence":"additional","affiliation":[{"name":"MEtRICs, Departamento de Ci\u00eancias e Tecnologia da Biomassa, NOVA School of Science and Technology|FCT NOVA, Campus de Caparica, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7032-3436","authenticated-orcid":false,"given":"Isabel","family":"Coelhoso","sequence":"additional","affiliation":[{"name":"LAQV-REQUIMTE, Departamento de Qu\u00edmica, NOVA School of Science and Technology|FCT NOVA, Campus de Caparica, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9270-3982","authenticated-orcid":false,"given":"Ana","family":"Fernando","sequence":"additional","affiliation":[{"name":"MEtRICs, Departamento de Ci\u00eancias e Tecnologia da Biomassa, NOVA School of Science and Technology|FCT NOVA, Campus de Caparica, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Souza, V.G.L., Rodrigues, C., Valente, S., Pimenta, C., Pires, J.R.A., Alves, M.M., Santos, C.F., Coelhoso, I.M., and Fernando, A.L. 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