Antimicrobial and Conductive Nanocellulose-Based Films for Active and Intelligent Food Packaging
authors Vilela, C; Moreirinha, C; Domingues, EM; Figueiredo, FML; Almeida, A; Freire, CSR
nationality International
journal NANOMATERIALS
author keywords bacterial nanocellulose; poly(sulfobetaine methacrylate); nanocomposite films; antimicrobial activity; moisture scavengers; active food packaging; protonic conductivity; intelligent food packaging
keywords ZWITTERIONIC POLY(SULFOBETAINE METHACRYLATE); PROTONIC CONDUCTIVITY; BACTERIAL; MEMBRANES; NANOCOMPOSITES; BEHAVIOR; NANOPARTICLES; COMPOSITES; NAFION(R); FIBER
abstract Bacterial nanocellulose (BNC) is becoming an important substrate for engineering multifunctional nanomaterials with singular and tunable properties for application in several domains. Here, antimicrobial conductive nanocomposites composed of poly(sulfobetaine methacrylate) (PSBMA) and BNC were fabricated as freestanding films for application in food packaging. The nanocomposite films were prepared through the one-pot polymerization of sulfobetaine methacrylate (SBMA) inside the BNC nanofibrous network and in the presence of poly(ethylene glycol) diacrylate as cross-linking agent. The ensuing films are macroscopically homogeneous, more transparent than pristine BNC, and present thermal stability up to 265 degrees C in a nitrogen atmosphere. Furthermore, the films have good mechanical performance (Young's modulus >= 3.1 GPa), high water-uptake capacity (450-559%) and UV-blocking properties. The zwitterion film with 62 wt.% cross-linked PSBMA showed bactericidal activity against Staphylococcus aureus (4.3-log CFU mL(-1) reduction) and Escherichia coli (1.1-log CFU mL(-1) reduction), and proton conductivity ranging between 1.5 x 10(-4) mS cm(-1) (40 degrees C, 60% relative humidity (RH)) and 1.5 mS cm(-1) (94 degrees C, 98% RH). Considering the current set of properties, PSBMA/BNC nanocomposites disclose potential as films for active food packaging, due to their UV-barrier properties, moisture scavenging ability, and antimicrobial activity towards pathogenic microorganisms responsible for food spoilage and foodborne illness; and also for intelligent food packaging, due to the proton motion relevant for protonic-conduction humidity sensors that monitor food humidity levels.
publisher MDPI
issn 2079-4991
year published 2019
volume 9
issue 7
digital object identifier (doi) 10.3390/nano9070980
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000478992600068
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  impact metrics
journal analysis (jcr 2019):
journal impact factor 4.324
5 year journal impact factor 4.514
category normalized journal impact factor percentile 65.762
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