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Open AccessFeature PaperArticle

UV Protective, Antioxidant, Antibacterial and Compostable Polylactic Acid Composites Containing Pristine and Chemically Modified Lignin Nanoparticles

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Grupo de Biotecnología y Materiales Biobasados, Facultad de Ingeniería, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN-UBA-CONICET), Universidad de Buenos Aires, C1127AAR Buenos Aires, Argentina
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Facultad de Ingeniería, Universidad de Buenos Aires, C1127AAR Buenos Aires, Argentina
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Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), C1127AAR Buenos Aires, Argentina
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Civil and Environmental Engineering Department, University of Perugia, UdR INSTM, 05100 Terni, Italy
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Department of Materials Technology and Engineering, Research Institute of Zhejiang University, Taizhou 317000, China
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Grupo de Ingeniería en Polímeros y MAteriales Compuestos, Facultad de Ingeniería, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN-UBA-CONICET), Universidad de Buenos Aires, C1127AAR Buenos Aires, Argentina
*
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Molecules 2021, 26(1), 126; https://doi.org/10.3390/molecules26010126
Received: 17 December 2020 / Revised: 23 December 2020 / Accepted: 26 December 2020 / Published: 29 December 2020
(This article belongs to the Special Issue PLA for Packaging Applications)
Polylactic acid (PLA) films containing 1 wt % and 3 wt % of lignin nanoparticles (pristine (LNP), chemically modified with citric acid (caLNP) and acetylated (aLNP)) were prepared by extrusion and characterized in terms of their overall performance as food packaging materials. Morphological, mechanical, thermal, UV–Vis barrier, antioxidant and antibacterial properties were assayed; appropriate migration values in food simulants and disintegration in simulated composting conditions were also verified. The results obtained indicated that all lignin nanoparticles succeeded in conferring UV-blocking, antioxidant and antibacterial properties to the PLA films, especially at the higher filler loadings assayed. Chemical modification of the fillers partially reduced the UV protection and the antioxidant properties of the resulting composites, but it induced better nanoparticles dispersion, reduced aggregates size, enhanced ductility and improved aesthetic quality of the films through reduction of the characteristic dark color of lignin. Migration tests and disintegration assays of the nanocomposites in simulated composting conditions indicated that, irrespectively of their formulation, the multifunctional nanocomposite films prepared behaved similarly to neat PLA. View Full-Text
Keywords: polylactic acid; nanocomposite films; lignin nanoparticles; chemical modification; food packaging polylactic acid; nanocomposite films; lignin nanoparticles; chemical modification; food packaging
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MDPI and ACS Style

Cavallo, E.; He, X.; Luzi, F.; Dominici, F.; Cerrutti, P.; Bernal, C.; Foresti, M.L.; Torre, L.; Puglia, D. UV Protective, Antioxidant, Antibacterial and Compostable Polylactic Acid Composites Containing Pristine and Chemically Modified Lignin Nanoparticles. Molecules 2021, 26, 126. https://doi.org/10.3390/molecules26010126

AMA Style

Cavallo E, He X, Luzi F, Dominici F, Cerrutti P, Bernal C, Foresti ML, Torre L, Puglia D. UV Protective, Antioxidant, Antibacterial and Compostable Polylactic Acid Composites Containing Pristine and Chemically Modified Lignin Nanoparticles. Molecules. 2021; 26(1):126. https://doi.org/10.3390/molecules26010126

Chicago/Turabian Style

Cavallo, Ema; He, Xiaoyan; Luzi, Francesca; Dominici, Franco; Cerrutti, Patricia; Bernal, Celina; Foresti, Maria L.; Torre, Luigi; Puglia, Debora. 2021. "UV Protective, Antioxidant, Antibacterial and Compostable Polylactic Acid Composites Containing Pristine and Chemically Modified Lignin Nanoparticles" Molecules 26, no. 1: 126. https://doi.org/10.3390/molecules26010126

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