6533b7d4fe1ef96bd12628f7
RESEARCH PRODUCT
Novel silver-based nanoclay as an antimicrobial in polylactic acid food packaging coatings.
Patricia FernandezMaria A. BusoloJose M. LagaronMaría José Ociosubject
Materials scienceTime FactorsPolymersHealth Toxicology and MutagenesisPolyestersMetal NanoparticlesNanotechnologyFood ContaminationMicrobial Sensitivity Testsengineering.materialToxicologyPermeabilitychemistry.chemical_compoundPolylactic acidCoatingMicroscopy Electron TransmissionSalmonellaFood PreservationNanotechnologyLactic Acidchemistry.chemical_classificationCalorimetry Differential ScanningSilicatesPublic Health Environmental and Occupational HealthFood preservationFood PackagingTemperatureSilver CompoundsGeneral ChemistryGeneral MedicinePolymerElectrochemical TechniquesAntimicrobialExfoliation jointAnti-Bacterial AgentsFood packagingSteamchemistryChemical engineeringengineeringFood MicrobiologyFood qualityFood Sciencedescription
This paper presents a comprehensive performance study of polylactic acid (PLA) biocomposites, obtained by solvent casting, containing a novel silver-based antimicrobial layered silicate additive for use in active food packaging applications. The silver-based nanoclay showed strong antimicrobial activity against Gram-negative Salmonella spp. Despite the fact that no exfoliation of the silver-based nanoclay in PLA was observed, as suggested by transmission electron microscopy (TEM) and wide angle X-ray scattering (WAXS) experiments, the additive dispersed nicely throughout the PLA matrix to a nanoscale, yielding nanobiocomposites. The films were highly transparent with enhanced water barrier and strong biocidal properties. Silver migration from the films to a slightly acidified water medium, considered an aggressive food simulant, was measured by stripping voltammetry. Silver migration accelerated after 6 days of exposure. Nevertheless, the study suggests that migration levels of silver, within the specific migration levels referenced by the European Food Safety Agency (EFSA), exhibit antimicrobial activity, supporting the potential application of this biocidal additive in active food-packaging applications to improve food quality and safety.
year | journal | country | edition | language |
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2010-08-17 | Food additivescontaminants. Part A, Chemistry, analysis, control, exposurerisk assessment |