Facile approach to enhance the antibacterial activity of ZnO nanoparticles

Abstract

In this study, we carried out a simple surface modification of zinc oxide nanoparticles (ZnO NPs) using didodecyldimethylammonium bromide (DDAB) as a cationic surfactant. The crystallographic properties, optical absorption, and morphology of the ZnO NPs did not change after the surface modification. The FT-IR spectra of the surface-modified ZnO NPs (SM-ZnO) showed the characteristic peaks of DDAB, which shifted to higher frequencies with an increase in the DDAB content. The zeta potential of the SM-ZnO NPs increased with an increase in the DDAB content and reaction time. The sedimentation test results revealed that the SM-ZnO NPs exhibited better dispersion and lower aggregation than pure ZnO NPs. The SM-ZnO NPs showed high surface positive charge, thereby generating additional Zn 2+ with higher surface tendency to the bacteria. The SM-ZnO NPs showed improved antibacterial activity against both Staphylococcus aureus and Escherichia coli strains as compared to the pure ZnO NPs.

Bryophyllum pinnatum mediated synthesis of zinc oxide nanoparticles: characterization and application as biocontrol agents for multi-drug-resistant uropathogens

“…The peculiar Bragg reflections were indexed at a position of (100), (002), (101), (102), (110), (103), (112), (201) and (202) crystal planes, and were observed to be wurtzite hexagonal phase of ZnO, which is in conformity with Joint Committee on Powder Diffraction Standards (JCPDS file 36–1451). Similar results have been reported by other scientists in previous studies as well [ 34 , 35 , 39 , 46 ].

Figure 6 XRD spectra of synthesized ZnO nanoparticles.

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“…The weak peak of 1018.12 resulted from the C–N stretch of aliphatic amines. The peaks obtained at 619.56 and 541.13 were attributed to the C- Alkyl chloride and hexagonal phase of ZnO [ 4 , 39 ].…”

Green synthesis of ZnO nanoparticles for antimicrobial and vegetative growth applications: A novel approach for advancing efficient high quality health care to human wellbeing

“…Consequently, cell wall-bounded ZnO nanoparticles cause pith formation of the microbial cell wall and loss the cell membrane integrity ( Umavathi et al, 2020 , Kim et al, 2020 , Viswanathan et al, 2020 ). Whereas Zn 2+ ions penetrated to the cytosol and binding with sulfur-containing amino acids, interference the bio-signaling affected the DNA replication, inactivated the electron transport chain, and reduced the ATP synthesis, causes mesosoma oxidative stress and mitochondrial oxidative stress.…”

Improved Characteristics of CdSe/CdS/ZnS Core-Shell Quantum Dots Using an Oleylamine-Modified Process

“…To develop high quality and high stability QDs, the type I core–shell structure of CdSe/CdS@ZnS or Zinc oxide (ZnO) QDs has been adopted in various studies, such as light-emitting diodes and biomedical applications. [ 13 , 14 , 15 ]. The ZnO shell is an ideal candidate as the shell on CdSe/CdS QDs and is usually deposited by atomic layer deposition.…”