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- Title
Active Low-Density Polyethylene-Based Films by Incorporating α-Tocopherol in the Free State and Loaded in PLA Nanoparticles: A Comparative Study.
- Authors
Azevedo, Ana G.; Barros, Carolina; Miranda, Sónia; Machado, Ana V.; Carneiro, Olga S.; Silva, Bruno; Andrade, Mariana A.; Vilarinho, Fernanda; Saraiva, Margarida; Sanches Silva, Ana; Pastrana, Lorenzo M.; Cerqueira, Miguel A.
- Abstract
In this work, alpha-tocopherol (α-TOC) was encapsulated in poly(lactic acid) nanoparticles (PLA NPs) and added to low-density polyethylene (LDPE) films with the aim of producing an active film for food packaging applications. PLA NPs loaded with α-TOC were produced through nanoprecipitation and dried using two methods (freeze-dryer and oven). LDPE-based films with final polymeric matrix concentrations of 10 and 20 g/kg were then produced through blow extrusion. The results showed that LDPE-based films loaded with α-TOC can be produced using blow extrusion, and a good distribution of PLA NPs can be obtained within the LDPE matrix as observed using scanning electron microscopy (SEM). The mechanical properties were affected by the incorporation of α-TOC and PLA NPs loaded with α-TOC, with the observation of a decrease in tensile strength and Young's Modulus values and an increase in elongation at break. Regarding water vapor permeability, the films showed a reduction in the values with the addition of α-TOC and PLA NPs loaded with α-TOC compared to the LDPE film (control). Films with α-TOC in the free state and loaded in PLA NPs showed antioxidant activity, but their behavior was affected by the encapsulation process.
- Subjects
FREE State (South Africa); ACTIVE food packaging; LOW density polyethylene; YOUNG'S modulus; NANOPARTICLES; SCANNING electron microscopy
- Publication
Foods, 2024, Vol 13, Issue 3, p475
- ISSN
2304-8158
- Publication type
Article
- DOI
10.3390/foods13030475