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Article

Design of Alginate-Based Bionanocomposites with Electrical Conductivity for Active Food Packaging

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Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
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Department of Materials and Ceramic Engineering, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
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Department of Physics, i3N, University of Aveiro, 3810-193 Aveiro, Portugal
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Department of Biology, CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
*
Authors to whom correspondence should be addressed.
Academic Editor: Jyh-Ping Chen
Int. J. Mol. Sci. 2021, 22(18), 9943; https://doi.org/10.3390/ijms22189943
Received: 13 August 2021 / Revised: 9 September 2021 / Accepted: 10 September 2021 / Published: 14 September 2021
Bionanocomposite materials have been designed as a promising route to enhance biopolymer properties, especially for food packaging application. The present study reports the preparation of bionanocomposite films of alginate with different loadings of pure reduced graphene oxide (rGO) or of mixed zinc oxide-rGO (ZnO-rGO) fillers by solvent casting. Sepiolite is used to make compatible rGO with the hydrophilic matrix. The addition of fillers to alginate matrix maintains the low water solubility promoted by the calcium chloride treatment, and, additionally, they demonstrate a weaker mechanical properties, and a slight increase in water vapor permeability and wettability. Due to the properties of ZnO-rGO, the alginate bionanocomposites show an increase of electrical conductivity with the increase of filler content. While the highest electrical conductivity (0.1 S/m) is achieved by the in-plane measurement, it is in the through-plane measurement the remarkable enhancement of almost 30 times greater than the alginate film. With 50% of ZnO-rGO filler, the bionanocomposites present the highest antioxidant and antibacterial activities. The combination of electrical conductivity with bioactive properties makes these films promising not only to extend food shelf-life but also to allow packaged food sterilization at low temperature. View Full-Text
Keywords: alginate; reduced graphene oxide; zinc oxide; antioxidant; antimicrobial alginate; reduced graphene oxide; zinc oxide; antioxidant; antimicrobial
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MDPI and ACS Style

Alves, Z.; Ferreira, N.M.; Mendo, S.; Ferreira, P.; Nunes, C. Design of Alginate-Based Bionanocomposites with Electrical Conductivity for Active Food Packaging. Int. J. Mol. Sci. 2021, 22, 9943. https://doi.org/10.3390/ijms22189943

AMA Style

Alves Z, Ferreira NM, Mendo S, Ferreira P, Nunes C. Design of Alginate-Based Bionanocomposites with Electrical Conductivity for Active Food Packaging. International Journal of Molecular Sciences. 2021; 22(18):9943. https://doi.org/10.3390/ijms22189943

Chicago/Turabian Style

Alves, Zélia, Nuno M. Ferreira, Sónia Mendo, Paula Ferreira, and Cláudia Nunes. 2021. "Design of Alginate-Based Bionanocomposites with Electrical Conductivity for Active Food Packaging" International Journal of Molecular Sciences 22, no. 18: 9943. https://doi.org/10.3390/ijms22189943

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