Table of Contents
Nanomaterials, Volume 8, Issue 3 (March 2018)
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Cover Story (view full-size image) Zinc oxide nanoparticles are promising additives in the fabrication of antibacterial food packaging [...] Read more. Zinc oxide nanoparticles are promising additives in the fabrication of antibacterial food packaging materials. In this study, we investigate the antibacterial activity (ABA) of suspensions of pure ZnO nanoparticles (ZnO-NPs) and mesoporous silica doped with ZnO (ZnO-UVM-7), as well as electrospun nanofibers based on poly(lactic acid) (PLA) and containing those nanoparticles. We showed a concentration-dependent and size-dependant effect of antibacterial nanoparticles on the viability of Escherichia coli (E. coli). The combination of the ultrasound stimulations and sterilization has considerably enhanced the antibacterial activity (ABA) of the ZnO suspensions. The results showed that, above an optimal concentration (1 wt ), the nanoparticles’ agglomeration and sedimentation of ZnO nanoparticles reduced the antimicrobial efficiency of PLA mats. However, the use of ZnO-UVM-7 silica-doped nanoparticles had probably improved the nanoparticles’ dispersion since the PLA nanofibers filled with