Synergistic effect of nano-ZnO and Mentha piperita essential oil on the moisture sorption isotherm, antibacterial activity, physicochemical, mechanical, and barrier properties of gelatin film
2022
Javidi, Sahar | Mohammadi Nafchi, Abdorreza | Moghadam, Hamid Hashemi
This study aimed to evaluate the synergistic effect of nano-ZnO (ZnO-N) and Mentha piperita essential oil (MEO) on the functional and antibacterial properties of bovine gelatin bionanocomposite film. A mixture of ZnO-N (1%, 3%, and 5%) and MEO (1%, 2%, and 3%) was incorporated into gelatin films. The physicochemical, mechanical, antimicrobial, and barrier properties of the films were explored. Results demonstrated that adding combined ZnO-N and MEO to films lead to decreased moisture content, solubility, water-absorption capacity, water vapor and oxygen permeability, and elongation. However, the thickness, tensile strength, Young’s modulus increased. Incorporating the combination of ZnO-N and MEO into films also reduced the monolayer and free-water content in the equilibrium-adsorption isotherm and shifted the isotherm to lower moisture content. These bionanocomposites showed good antibacterial activity against Escherichia coli O157:H7. In summary, a synergistic effect was observed by incorporating ZnO-N and MEO in active gelatin films.
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