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Melt Extrusion of Environmentally Friendly Poly(L-lactic acid)/Sodium Metabisulfite Films for Antimicrobial Packaging Applications

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Journal of Renewable Materials 2021年第2期9卷 337-349页

作者： Norma M.P.Machado Gustavo C.Melo Matheus F.Camargo Giulianna G.Feijó Bruna M.S.Putton Clarice Steffens Rogerio L.Cansian Luiz A.Pessan francys k.v.moreira Department of Materials Engineering Federal University of São CarlosSão CarlosBrazil Department of Food Engineering Regional Integrated University of High Uruguay and Missions(URI)ErechimBrazil

Food packaging materials compounded with antimicrobial additives can substantially diminish the incidence of foodborne ***,poly(L-lactic acid)(PLA)films containing sodium metabisulfite(NaM)were produced by melt extrusion as an attempt to develop a new biodegradable material with antimicrobial properties for *** cycle assessment(LCA)simulations revealed that the environmental footprints of the PLA film did not change upon NaM addition,and that NaM is more eco-friendly than silver *** PLA/NaM films with NaM content varying from 0.5 to 5.0 wt.%were characterized by differential scanning calorimetry(DSC),thermogravimetric analysis(TGA),and optical and mechanical properties *** optical properties were sustained after the addition of NaM,but high NaM contents degraded the light transparence of the PLA matrix at some *** thermal stability and tensile properties of the PLA film decreased proportionally to the NaM content,while no changes were observed on Tg,Tm and Xc,as determined by *** diffusion tests revealed that the PLA/NaM films had no antimicrobial activity on Saccharomyces cerevisiae at 35°C,which was related to the limited migration of NaM from the glassy PLA *** biodegradable PLA films compounded with NaM through melt extrusion display adequate optical,thermal,and mechanical properties to cover most food packaging applications,representing an essential step toward the development of eco-friendly packaging materials that can potentially exhibit an antimicrobially active surface.

关键词： Biobased packaging antimicrobial activity life cycle assessment

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