Hydroxyapatite mineralization of chitosan-tragacanth blend/ZnO/Ag nanocomposite films with enhanced antibacterial activity

Improving the antibacterial activity of biodegradable materials is crucial for combatting widespread drug-resistant bacteria and plastic pollutants. In this work, we studied polyaniline (PANI)-functionalized zinc oxide nanoparticles (ZnO NPs) to improve surface charges. A PANI-functionalized ZnO NP surface was prepared using a simple impregnation technique. The PANI functionalization of ZnO successfully increased the positive surface charge of the ZnO NPs. In addition, PANI-functionalized ZnO improved mechanical properties and thermal stability. Besides those properties, the water permeability of the bionanocomposite films was decreased due to their increased hydrophobicity. PANI-functionalized ZnO NPs were applied to thermoplastic starch (TPS) films for physical properties and antibacterial studies using Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The PANI-functionalized ZnO bionanocomposite films exhibited excellent antibacterial activity for both E. coli (76%) and S. aureus (72%). This result suggests that PANI-functionalized ZnO NPs can improve the antibacterial activity of TPS-based bionanocomposite films.

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Antimicrobial Effect of Chitosan Films on Food Spoilage Bacteria

International Journal of Molecular Sciences ◽

10.3390/ijms22115839 ◽

2021 ◽

Vol 22 (11) ◽

pp. 5839

Author(s):

Natalia Wrońska ◽

Nadia Katir ◽

Katarzyna Miłowska ◽

Nisrine Hammi ◽

Marta Nowak ◽

...

Keyword(s):

Antibacterial Activity ◽

Graphene Oxide ◽

Metal Oxide ◽

Oxide Films ◽

Nanocomposite Films ◽

Metal Oxide Films ◽

Spoilage Bacteria ◽

Modified Graphene Oxide ◽

Chitosan Films ◽

Modified Graphene

Synthetic materials commonly used in the packaging industry generate a considerable amount of waste each year. Chitosan is a promising feedstock for the production of functional biomaterials. From a biological point of view, chitosan is very attractive for food packaging. The purposes of this study were to evaluate the antibacterial activity of a set of chitosan-metal oxide films and different chitosan-modified graphene (oxide) films against two foodborne pathogens: Campylobacter jejuni ATCC 33560 and Listeria monocytogenes 19115. Moreover, we wanted to check whether the incorporation of antimicrobial constituents such as TiO2, ZnO, Fe2O3, Ag, and graphene oxide (GO) into the polymer matrices can improve the antibacterial properties of these nanocomposite films. Finally, this research helps elucidate the interactions of these materials with eukaryotic cells. All chitosan-metal oxide films and chitosan-modified graphene (oxide) films displayed improved antibacterial (C. jejuni ATCC 33560 and L. monocytogenes 19115) properties compared to native chitosan films. The CS-ZnO films had excellent antibacterial activity towards L. monocytogenes (90% growth inhibition). Moreover, graphene-based chitosan films caused high inhibition of both tested strains. Chitosan films with graphene (GO, GOP, GOP-HMDS, rGO, GO-HMDS, rGOP), titanium dioxide (CS-TiO2 20:1a, CS-TiO2 20:1b, CS-TiO2 2:1, CS-TiO2 1:1a, CS-TiO2 1:1b) and zinc oxide (CS-ZnO 20:1a, CS-ZnO 20:1b) may be considered as a safe, non-cytotoxic packaging materials in the future.

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Surface analysis of nitrogen plasma-treated C60/PS nanocomposite films for antibacterial activity

Journal of Biological Physics ◽

10.1007/s10867-017-9447-6 ◽

2017 ◽

Vol 43 (2) ◽

pp. 211-224 ◽

Cited By ~ 3

Author(s):

Naglaa M. EL-Sayed ◽

Fifi M. Reda ◽

Omar F. Farag ◽

Doaa A. Nasrallah

Keyword(s):

Antibacterial Activity ◽

Surface Analysis ◽

Nitrogen Plasma ◽

Nanocomposite Films

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Effect of Synthesis Temperature on the Size of ZnO Nanoparticles Derived from Pineapple Peel Extract and Antibacterial Activity of ZnO–Starch Nanocomposite Films

Nanomaterials ◽

10.3390/nano10061061 ◽

2020 ◽

Vol 10 (6) ◽

pp. 1061 ◽

Cited By ~ 1

Author(s):

Hasbullah Hassan Basri ◽

Rosnita A. Talib ◽

Rashidah Sukor ◽

Siti Hajar Othman ◽

Hidayah Ariffin

Keyword(s):

Electron Microscopy ◽

Zinc Oxide ◽

Antibacterial Activity ◽

Zno Nanoparticles ◽

Synthesis Temperature ◽

Nanocomposite Films ◽

Zno Nps ◽

Gram Positive ◽

X Ray ◽

Pineapple Peel

This research investigated the effect of synthesis temperature on the size and shape of zinc oxide (ZnO) nanoparticles (NPs) synthesized using pineapple peel waste and antibacterial activity of ZnO NPs in starch films. Zinc oxide NPs synthesized at different temperatures were characterized by Fourier transform infrared spectroscopy, X-ray diffraction analysis, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. Micrographs of ZnO NPs synthesized at 28 and 60 °C showed that synthesis temperature affected the sizes and shapes of ZnO NPs. The non-heated (28 °C) condition resulted in NPs with diameters in the range of 8–45 nm with a mixture of spherical and rod shapes, whereas the heated (60 °C) condition led to NPs with diameters in the range of 73–123 nm with flower rod shapes. The ZnO–starch nanocomposite films incorporated with 1, 3, and 5 wt.% ZnO NPs were prepared via a film casting method. The antibacterial activity of the films against Gram-positive and Gram-negative bacteria was investigated using the disc diffusion method. The results showed an increase in the inhibition zone for Gram-positive bacteria, particularly Bacillus subtilis, when the concentration of ZnO NPs incorporated in the film was increased from 1 to 5 wt.%.

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