Bacterial cellulose (BC) monolayer and multilayer films, incorporating 5 wt.% ZnO nanoparticles (NPs)have been obtained. Ultrasound (US) irradiation (40 kHz) was applied during ZnO-BC nanocompositespreparation. X-ray diffraction (XRD) patterns showed that ZnO NPs were crystallized in their pure phase.SEM scanning electron microscopy (SEM) results indicated that US treatment causes to decrease ZnOparticle size, forming a stable hybrid nanostructure and evenly distributed ZnO NPs coated BC nanofibers.ZnO NPs enhanced the mechanical properties and diminished water vapor permeability and moistureabsorption of BC films. Antibacterial activity of ZnO-BC films against Staphylococcus aureus was morethan Escherichia coli. The antibacterial activity was enhanced with the utilization of US irradiation. TheZnO release was influenced by films composition; the multilayer and US treated films being promising inorder to achieve controlled release of ZnO. Results suggest that ZnO-BC films may be used as controlledrelease antimicrobial food active packaging.
کلید واژگان :Bacterial celluloseZnO nanoparticlesUltrasound irradiationMorphologyAntibacterial activityControlled release
ارزش ریالی : 600000 ریال
با پرداخت الکترونیک