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UV Protective, Antioxidant, Antibacterial and Compostable Polylactic Acid Composites Containing Pristine and Chemically Modified Lignin Nanoparticles.
- Source :
-
Molecules (Basel, Switzerland) [Molecules] 2020 Dec 29; Vol. 26 (1). Date of Electronic Publication: 2020 Dec 29. - Publication Year :
- 2020
-
Abstract
- 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.
- Subjects :
- Anti-Bacterial Agents chemistry
Anti-Bacterial Agents pharmacology
Antioxidants chemistry
Antioxidants pharmacology
Biodegradable Plastics pharmacology
Biphenyl Compounds chemistry
Biphenyl Compounds pharmacology
Carbamates chemistry
Carbamates pharmacology
Citric Acid chemistry
Citric Acid pharmacology
Fullerenes chemistry
Fullerenes pharmacology
Lignin pharmacology
Nanocomposites ultrastructure
Nanoparticles chemistry
Nanoparticles ultrastructure
Niacinamide analogs & derivatives
Niacinamide chemistry
Niacinamide pharmacology
Polyesters pharmacology
Pyrazoles chemistry
Pyrazoles pharmacology
Sunscreening Agents chemistry
Sunscreening Agents pharmacology
Biodegradable Plastics chemistry
Food Packaging
Lignin chemistry
Nanocomposites chemistry
Polyesters chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1420-3049
- Volume :
- 26
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Molecules (Basel, Switzerland)
- Publication Type :
- Academic Journal
- Accession number :
- 33383931
- Full Text :
- https://doi.org/10.3390/molecules26010126