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Antibacterial poly(lactic acid) (PLA) films grafting electrospun PLA/Ally isothioscyanate (AITC) fibers for food packaging

Kara, Hasan H., Xiao, Fugang, Sarker, Majher, Jin, Tony Z., Sousa, Ana M. M., Liu, Cheng-Kung, Tomasula, Peggy M., Liu, LinShu
Journal of applied polymer science 2015 v.Article 42475
Escherichia coli, Listeria innocua, air, allyl isothiocyanate, antibacterial properties, bacterial contamination, cold, encapsulation, food contamination, food packaging, foods, growth retardation, mechanical properties, packaging films, polymers, scanning electron microscopy, temperature, washing
Poly(lactic acid) (PLA) fibers of submicron sizes encapsulating allyl isothiocyanate (AITC) (PfA) were made and electrospun onto the surfaces of PLA films (PfA-g-film). SEM examination confirmed that the fibers were grafted to the PLA film after the (PfA-g-film) underwent air blowing and water washing. The PfA-g-films retained the mechanical properties of PLA. The release of AITC from the fibers was temperature-dependent. At temperatures lower than 4 deg C the incorporated AITC remained within the fibers without losing activity; at room temperature, AITC released in a sustained manner over weeks. The release of AITC was also dependent on its initial concentration in the PLA electrospinning solution, samples with more AITC incorporated showed a higher release rate. PfA-g-films significantly inhibited the growth of Listeria innocua and E. coli k12 when tested on packaged foods.