Active Low-Density Polyethylene-Based Films by Incorporating α-Tocopherol in the Free State and Loaded in PLA Nanoparticles: A Comparative Study

Author:

Azevedo Ana G.1ORCID,Barros Carolina2,Miranda Sónia3,Machado Ana V.2,Carneiro Olga S.2ORCID,Silva Bruno3,Andrade Mariana A.45ORCID,Vilarinho Fernanda4ORCID,Saraiva Margarida6ORCID,Sanches Silva Ana789,Pastrana Lorenzo M.1ORCID,Cerqueira Miguel A.1ORCID

Affiliation:

1. International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal

2. Institute for Polymers and Composites, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal

3. Centre for Innovation in Polymer Engineering, University of Minho, Campus de Azurém, Edifício 15, 4800-058 Guimarães, Portugal

4. National Institute of Health Doutor Ricardo Jorge, Avenida Padre Cruz, 1649-016 Lisboa, Portugal

5. Associated Laboratory for Green Chemistry of the Network of Chemistry andTechnology (REQUIMTE/LAQV), R. D. Manuel II, Apartado, 55142 Porto, Portugal

6. National Institute of Health Doutor Ricardo Jorge, Rua Alexandre Herculano, 321, 4000-055 Porto, Portugal

7. Pharmacy Faculty, University of Coimbra, Polo III, Azinhaga de Stª Comba, 3000-548 Coimbra, Portugal

8. Center for Study in Animal Science (CECA), ICETA, University of Porto, 4501-401 Porto, Portugal

9. Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal

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.

Funder

European Regional Development Fund

National Funds through FCT-Portuguese Foundation for Science and Technology

Publisher

MDPI AG

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