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Preparation and characterization of functional sodium caseinate/guar gum/TiO2/cumin essential oil composite film

Alizadeh-Sani, Mahmood, Rhim, Jong-Whan, Azizi-Lalabadi, Maryam, Hemmati-Dinarvand, Mohsen, Ehsani, Ali
International journal of biological macromolecules 2020 v.145 pp. 835-844
Escherichia coli O157, Listeria monocytogenes, Staphylococcus aureus, antibacterial properties, bacteria, composite films, cumin, essential oils, guar gum, mechanical properties, nanocomposites, permeability, polymers, sodium caseinate, titanium dioxide
Eco-friendly functional bionanocomposite films were prepared using sodium caseinate (SC) and guar gum (GG) as the polymer matrix and TiO₂ and cumin essential oil (CEO) as functional fillers. 0.2 vol% GG selected for the preparation of SC/GG composite film and various amount of TiO₂ and CEO (1 and 2 wt% based on SC) were incorporated into the SC/GG film either individually or in combination. The addition of TiO₂ and CEO significantly improved the water permeability and sensitivity properties and mechanical characteristics such as the strength (TS), stiffness (YM), and flexibility (EB) of the composite films. Also, the SC/GG films incorporated with TiO₂ and CEO exhibited remarkable antibacterial activity against both Gram-positive (L. monocytogenes and S. aureus) and Gram-negative (E. coli O157: H7 and S. enteritidis) bacteria. All the film properties were varied not only on the concentration of TiO₂ and CEO, but also increased synergistically when they were added together.