Study on the antibacterial properties of BiOIO3/graphene oxide (GO) modified fluorocarbon resin coating (PEVE) under UV light

Prepared and heat-treated sol-gel ZnO-TiO2 coatings onto microscope glass slides were characterised by atomic force microscopy (AFM), scanning electron microscopy (SEM), as well as absorption spectra of light has been obtained. Thermally treated xerogels were characterised by X-ray diffraction (XRD). As well as their photocatalytic activity using methyl orange (MO) and observing the colour changes over the time in visible light (VIS) and ultra violet (UV) light has been determined. The influence of ZnO concentration on morphology, photocatalytic activity and antibacterial properties of coatings was analysed. The growth of S. epidermidis on the surface of the samples was inhibited due to photocatalytic properties of coatings.

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Preparation and antibacterial properties of an AgBr@SiO2/GelMA composite hydrogel

Biomedical Materials ◽

10.1088/1748-605x/ac49f7 ◽

2022 ◽

Author(s):

Bo Li ◽

Hong Li ◽

Haocheng Yang ◽

Yue Shu ◽

Kejiang Li ◽

...

Keyword(s):

Mechanical Properties ◽

Uv Light ◽

Antibacterial Properties ◽

Silver Ions ◽

Skin Wound ◽

Wound Dressings ◽

Sprague Dawley ◽

Sio2 Microspheres ◽

Modified Stöber Method

Abstract Pure gelatin hydrogels lack antibacterial function and have poor mechanical properties, which restrict their application in wound dressings. In this study, nanosized silver bromide-doped mesoporous silica (AgBr@SiO2) microspheres with hollow structures were prepared by a modified Stober method. The novel microspheres can not only release silver ions to treat bacteria but also release drugs to treat skin wound. Furthermore, AgBr@SiO2 microspheres were modified with propyl methacrylate, incorporated into methacrylated gelatin (GelMA), and crosslinked by UV light to prepare AgBr@SiO2/GelMA dressings consisting of composite hydrogels. The results showed that the AgBr@SiO2 microspheres could enhance the mechanical properties of the hydrogels. With the increase in the AgBr@SiO2 concentration from 0.5 to 1 mg/mL, the dressings demonstrated effective antimicrobial activity against both Staphylococcus aureus and Escherichia coli. Furthermore, full-thickness skin wounds in vivo wound healing studies with Sprague–Dawley rats were evaluated. When treated with AgBr@SiO2/GelMA containing 1 mg/mL AgBr@SiO2, only 15% of the wound area left on day 10. Histology results also showed the epidermal and dermal layers were better organized. These results suggest that AgBr@SiO2/GelMA-based dressing materials could be promising candidates for wound dressings.

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Antimicrobial and Antibiofilm Properties of Graphene Oxide on Enterococcus faecalis

Antibiotics ◽

10.3390/antibiotics9100692 ◽

2020 ◽

Vol 9 (10) ◽

pp. 692

Author(s):

Cecilia Martini ◽

Francesca Longo ◽

Raffaella Castagnola ◽

Luca Marigo ◽

Nicola Maria Grande ◽

...

Keyword(s):

Graphene Oxide ◽

Enterococcus Faecalis ◽

Antibacterial Properties ◽

Luria Bertani ◽

Bacterial Suspension ◽

Adhesion Properties ◽

High Antibacterial Activity ◽

Luria Bertani Broth ◽

Bacterial Film

The aim of this study was to evaluate the antibacterial properties of graphene oxide (GO) against Enterococcus faecalis in vitro conditions and when used to coat dentin surface to prevent E. faecalis adhesion. The ATCC strain of E. faecalis 29212 has been used to perform a viability test. The pellet was suspended in ultrapure water, NaCl, PBS buffer, CaCl2 and MgCl2, Luria−Bertani broth solutions. The viability was evaluated by the colony forming unit counting method. Atomic force microscopy images and the measure of surface zeta potential variation were analyzed. Dentin discs were covered with a film of GO (n = 15) or were not treated (n = 15). Bacterial suspension was added to each sample of dentine discs and microbial counts were calculated. Statistically significant differences between two groups were assessed by a two-tailed unpaired t-test. Bacteria cell morphology was investigated with scanning electron microscopy. The highest growth inhibition was obtained in ddH2O and CaCl2 solution while, in PBS and NaCl, GO had poor antibacterial efficacy with a growth enhancing effect in the latter. GO on dentin discs demonstrated high antibacterial activity. GO film has demonstrated acceptable adhesion properties to root dentin and a role in the inhibition of bacterial film proliferation and biofilm formation.

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Effect of CeO2-ZnO Nanocomposite for Photocatalytic and Antibacterial Activities

Crystals ◽

10.3390/cryst10090817 ◽

2020 ◽

Vol 10 (9) ◽

pp. 817

Author(s):

Asad Syed ◽

Lakshmi Sagar Reddy Yadav ◽

Ali H. Bahkali ◽

Abdallah M. Elgorban ◽

Deshmukh Abdul Hakeem ◽

...

Keyword(s):

Surface Defects ◽

Uv Light ◽

Antibacterial Properties ◽

Combustion Method ◽

Antibacterial Activities ◽

Cubic Phase ◽

Solution Combustion ◽

Tem Analysis ◽

Bet Specific Surface Area ◽

The Impact

The impact of a CeO2-ZnO nanocomposite on the photocatalytic and antibacterial properties compared to bare ZnO was investigated. A CeO2-ZnO nanocomposite was synthesized using Acacia nilotica fruit extract as a novel fuel by a simple solution combustion method. The obtained CeO2-ZnO nanocomposite was confirmed structurally by XRD, FTIR, Raman and UV-DRS and morphologically by SEM/TEM analysis. The XRD pattern indicates the presence of both hexagonal Wurtzite-structured ZnO (major) and cubic-phase CeO2 (minor). FTIR shows the presence of a Ce-O-Ce vibration at 468 cm−1 and Zn-O vibration at 445 cm−1. The existence of a band at 460 cm−1 confirmed the F2g Raman-active mode of the fluorite cubic crystalline structure for CeO2. Diffused reflectance spectroscopy was used to estimate the bandgap (Eg) from Kubelka–Munk (K–M) theory which was found to be 3.4 eV. TEM analysis shows almost spherical-shaped particles, at a size of about 10–15 nm. The CeO2-ZnO nanocomposite shows a good BET specific surface area of 30 m2g−1. The surface defects and porosity of the CeO2-ZnO nanocomposite caused methylene blue (MB) dye to degrade under sunlight (88%) and UV light (92%). The CeO2-ZnO nanocomposite also exhibited considerable antibacterial activity against a pathogenic bacterial strain.

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