Binary and ternary polymeric films based on polyvinyl alcohol (PVA), chitosan (CH) and lignin nanopar-ticles (LNP) added at two different amounts (1 and 3 wt%) were produced by solvent casting. Thermal,optical, mechanical properties, migration, antioxidant and antibacterial activities, as well as morpholo-gies of binary and ternary PVA/CH/LNP nanocomposites, were investigated. Mechanical results revealedthat the addition of LNP enhanced the tensile strength and Young’s modulus of PVA, producing alsoa toughness effect in CH matrix. Higher crystallinity values measured in calorimetric characterizationconfirmed how well dispersed LNP could effectively provide nucleation effects in PVA. Furthermore,LNP notably improved the thermal stability of the binary and ternary nanocomposite systems. Antimi-crobial assays revealed a capacity to inhibit the bacterial growth of Gram negative Erwinia carotovorasubsp. carotovora and Xanthomonas arboricola pv. pruni over the time, suggesting innovative opportuni-ties against bacterial plant/fruit pathogens in food packaging applications. In addition, the synergic effectof LNP and CH in the antioxidation response of the produced films potentially envisage their use in manydifferent biomedical applications (drug delivery, tissue engineering, wound healing), where innovativeantimicrobial strategies are continuously required.
Antioxidant and antibacterial lignin nanoparticles in polyvinyl alcohol/chitosan films for active packaging
YANG, WEIJUN;FORTUNATI, ELENA;KENNY, Jose Maria;TORRE, Luigi;PUGLIA, Debora
2016
Abstract
Binary and ternary polymeric films based on polyvinyl alcohol (PVA), chitosan (CH) and lignin nanopar-ticles (LNP) added at two different amounts (1 and 3 wt%) were produced by solvent casting. Thermal,optical, mechanical properties, migration, antioxidant and antibacterial activities, as well as morpholo-gies of binary and ternary PVA/CH/LNP nanocomposites, were investigated. Mechanical results revealedthat the addition of LNP enhanced the tensile strength and Young’s modulus of PVA, producing alsoa toughness effect in CH matrix. Higher crystallinity values measured in calorimetric characterizationconfirmed how well dispersed LNP could effectively provide nucleation effects in PVA. Furthermore,LNP notably improved the thermal stability of the binary and ternary nanocomposite systems. Antimi-crobial assays revealed a capacity to inhibit the bacterial growth of Gram negative Erwinia carotovorasubsp. carotovora and Xanthomonas arboricola pv. pruni over the time, suggesting innovative opportuni-ties against bacterial plant/fruit pathogens in food packaging applications. In addition, the synergic effectof LNP and CH in the antioxidation response of the produced films potentially envisage their use in manydifferent biomedical applications (drug delivery, tissue engineering, wound healing), where innovativeantimicrobial strategies are continuously required.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
