Physical, mechanical, and antibacterial characteristics of bio‐nanocomposite films loaded with Ag‐modified SiO₂ and TiO₂ nanoparticles

Abstract

In this study, starch-based films incorporating metal oxide (MO 2 ) nanoparticles (NPs) of TiO 2 and SiO 2 (at a concentration of 1 to 4 wt. %) were produced by solution casting method. In order to exhibit antimicrobial properties, MO 2 NPs were modified by synthesizing silver (Ag) ions over the NPs using cationic adsorption method. Ag ions were then reduced to metallic Ag by sodium borohydride solution. Scanning electron microscopy showed a smooth surface for the pure starch film. Incorporating MO 2 @Ag NPs in the films increased surface roughness with agglomerated NPs within starch matrix. Energy dispersive X-ray analysis exhibited a uniform dispersion of Ag-loaded MO 2 NPs, which increases surface contact between these NPs and the biopolymer matrix leading to improved physical and mechanical properties of the resulting films. With increasing in the NPs concentrations, the tensile strength and elongation at break % of the films increased and decreased, respectively. Incorporating MO 2 @Ag NPs into starch matrix decreased solubility in water and water vapor permeability of the obtained films, and significantly inhibited the growth of Escherichia coli and Staphylococcus aureus. The most antibacterial effect was obtained for the films containing higher weight concentrations of Ag-loaded SiO 2 -NPs.

RETRACTED: Biomaterial-Modified Magnetic Nanoparticles γ-Fe2O3, Fe3O4 Used to Improve the Efficiency of Hyperthermia of Tumors in HepG2 Model

“…In the field of cancer treatment, one of the fields where magnetic nanotechnologies are most needed, many new superparamagnetic nanoparticles were recently developed, to name a few, Mg 0.13 Fe 2 O 3 and FASP-Fe 3 O 4 , etc. [10][11][12][13][14][15].…”

The Potential of Silver Nanoparticles for Antiviral and Antibacterial Applications: A Mechanism of Action

“…Modification of AgNPs by incorporating metal oxide through a solution casting method exhibited a uniform dispersion of nanoparticles. These modified nanoparticles also inhibit the growth of Escherichia coli and Staphylococcus aureus as well as prevent formation of film [57].…”

Properties and Application of Multifunctional Composite Polypropylene-Based Films Incorporating a Combination of BHT, BHA and Sorbic Acid in Extending Donut Shelf-Life

“…Therefore, the addition of active substances via active packaging may be more effective than their addition to the food bulk [2,33]. In this way, continuous replenishment of active substances through a controlled release mechanism from the packaging material to the food surface provides a sustained food protection and the possibility of using a lower amount of additives [34][35][36][37].…”