Design of Alginate-Based Bionanocomposites with Electrical Conductivity for Active Food Packaging
authors Alves, Z; Ferreira, NM; Mendo, S; Ferreira, P; Nunes, C
nationality International
journal INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
author keywords alginate; reduced graphene oxide; zinc oxide; antioxidant; antimicrobial
keywords GRAPHENE OXIDE HYBRID; IONIC CROSS-LINKING; MECHANICAL-PROPERTIES; NANOCOMPOSITE FILMS; ZNO NANOPARTICLES; CHITOSAN; FACILE; COMPOSITE
abstract 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.
publisher MDPI
isbn 1422-0067
year published 2021
volume 22
issue 18
digital object identifier (doi) 10.3390/ijms22189943
web of science category 15
subject category Biochemistry & Molecular Biology; Chemistry, Multidisciplinary
unique article identifier WOS:000699527300001

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