Enhanced cell-wall damage mediated, antibacterial activity of core–shell ZnO@Ag heterojunction nanorods against Staphylococcus aureus and Pseudomonas aeruginosa

Ponnuvelu, Dinesh Veeran; Suriyaraj, S. P.; Thiruvenkatam, Vijayaraghavan; Selvakumar, R.; Pullithadathail, Biji

doi:10.1007/s10856-015-5535-y

Cited by 25 publications

(4 citation statements)

References 49 publications

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“…However, the zones of inhibitions produced against A. flavus, A. terreus, and L. theobromae were comparable with standard antibiotic drugs but did not exceed. FDNP-induced inhibition of P. syringae is comparable with chemically synthesized Ag:ZnO NPs [63], and it can be attributed to the provisioning of larger surface area of FDNPs toward microbial contact. Studies have supported the effectiveness of combining NPs with antibiotic drugs, and their synergistic effects were commendable [64].…”

Section: Resultsmentioning

confidence: 74%

Foliar-mediated Ag:ZnO nanophotocatalysts: green synthesis, characterization, pollutants degradation, and in vitro biocidal activity

Jaffri

Ahmad

2019

Green Processing and Synthesis

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A green, biomimetic, and one-pot synthesis of silver-doped zinc oxide (ZnO:Ag) nanoparticles via hydrothermal route utilizing Prunus cerasifera leaf extract has been reported for the first time. Synthetic route involved optimization for leaf extract. Doped nanoparticles were characterized for crystalline, optical, compositional, and morphological makeup via X-ray diffraction (XRD), ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy. Direct energy bandgap was calculated through Tauc plot. The incorporation of Ag+ into Zn2+ sites within ZnO crystal was obtained using leaf extract as a reducing agent. Ag inculcated positional modifications in ZnO structure confirmed via XRD-shifted peaks. Ag:ZnO nanoparticles were found to be an efficient nanophotocatalyst against bromocresol green and bromophenol blue (R2=0.83 and 0.95, respectively) in direct solar irradiance. Degradation efficiencies up to 86% and 95% in less than 15min were achieved. Furthermore, the synthesized doped nanoparticles expressed highly active to active zones of inhibition against nine microbes of pathogenic nature toward human and crops. Doped nanoparticles inhibitory activity was found to exceed standard antibiotic drugs ampicillin and amphotericin B in a standard Kirby-Bauer disc diffusion assay. Creditable photocatalytic and antimicrobial activities of synthesized doped nanoparticles signify their prospects in commercialization into nanophotocatalyst and bactericidal/fungicidal agent at industrial scale.

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Section: Resultsmentioning

confidence: 74%

Foliar-mediated Ag:ZnO nanophotocatalysts: green synthesis, characterization, pollutants degradation, and in vitro biocidal activity

Jaffri

Ahmad

2019

Green Processing and Synthesis

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“…The high amount of Ag leads to a higher OD 260 . It is demonstrated that nano Ag is beneficial to break the cell membrane 73 . Moreover, the destructive speed for S. putrefaciens is is faster than P. aeruginosa , which may be because of the different structure and thickness of the two bacterial membranes.…”

Section: Resultsmentioning

confidence: 99%

Preparation, characterization and antibacterial mechanism of the chitosan coatings modified by Ag/ZnO microspheres

Wei

et al. 2020

J Sci Food Agric

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BACKGROUND: To improve the physicochemical and antibacterial properties of coatings, the chitosan (CS) coatings were respectively prepared by a casting method with zinc oxide (ZnO) and silver (Ag)/ZnO microspheres as modifiers. The chemical structures and micromorphology of ZnO, Ag/ZnO microspheres and CS coatings were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. Furthermore, using the dominant spoilage bacteria of aquatic products, Shewanella putrefaciens and Pseudomonas aeruginosa, as objects, the antibacterial activities and mechanism of the CS coatings were investigated. RESULTS: The results show that ZnO and Ag/ZnO microspheres are dispersed homogeneously in the CS coatings. After modified by ZnO and Ag/ZnO microspheres, the mechanical properties and antibacterial abilities of the CS coatings are improved, and that of 0.5% Ag/ZnO-CS coating is the optimal. For pure CS coating, the bacterial cell membrane is damaged slightly because of the electrostatic interaction between NH 3+ of CS and the negative charge on bacterial surface. After treated by ZnO-CS composite coating, the bacterial cell membrane is destroyed badly on account of the earlier-mentioned ion interaction and disturbing the synthesis of high molecular weight total protein. CONCLUSION: With regard to Ag/ZnO-CS composite coating, the bacterial cell membrane is damaged seriously and cell contents are completely released due to ion interaction, disturbing the synthesis of high molecular weight total protein and low molecular weight membrane protein. Hence, Ag/ZnO-CS composite coatings are antimicrobial materials and food preservative materials with great potential application.

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“…Silver nanoparticles with an average size of about 7 nm were designed on heterojunctions at the surface of the ZnO nanorods. The probable mechanism derives from the generation of reactive oxygen species due to electron transfer between zinc oxide nanorods and silver nanoclusters which triggers physical destruction of the bacterial cell wall [74].…”

Section: Antibacterial Activity Of Core-shell Nanoparticlesmentioning

confidence: 99%

Complications of Antibiotic Therapy and Introduction of Nanoantibiotics

Lasemi¹,

Navi²,

Lasemi³

et al. 2016

A Textbook of Advanced Oral and Maxillofacial Surgery Volume 3

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Oral and maxillofacial surgeons play a major role in therapy, preventing morbidity, mortality from odontogenic and non-odontogenic maxillofacial infections therefore, it is essential to have knowledge of current advancements in microbiological diagnosis and antibiotic therapy for odontogenic maxillofacial infections. Fortunately, we live in an era where antibiotics are readily available to prevent and treat against infections. The exact cause should be determined once the specific antibiotic is prescribed additionally, the empirical, definitive treatments, side effects, pharmacokinetics and pharmacodynamics of antibacterial agents have to be considered.Nowadays, antimicrobial resistance which is spreading rapidly is of great concern, because it is common in hospitals where acquired infections can be perilous. This situation compels scientists to synthesize new antibiotics and treatment modalities. The reason of microbial resistance can be due to increased misuse of antibiotics in foods livestock, poultry and agriculture . " number of significant factors, such as organism identification, antibiotic sensitivity testing and host factor situations, should be taken into account in order to treat various infections effectively.Currently, investigations are ongoing to impede antibacterial resistance by nanoscience technology seeking new chemotherapeutic agents. Scientists focusing on microbiological investigations aim to invent novel nanoantibiotic agents with high efficiency, low toxicity and low percentage of resistance. In recent years, nanoantibiotics have been applied against infections intelligently. The average size, polydispersity and composition of generated nanomaterials can be controlled by various methods in order to make them appropriate for biomedical applications.

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Enhanced cell-wall damage mediated, antibacterial activity of core–shell ZnO@Ag heterojunction nanorods against Staphylococcus aureus and Pseudomonas aeruginosa

Cited by 25 publications

References 49 publications

Foliar-mediated Ag:ZnO nanophotocatalysts: green synthesis, characterization, pollutants degradation, and in vitro biocidal activity

Foliar-mediated Ag:ZnO nanophotocatalysts: green synthesis, characterization, pollutants degradation, and in vitro biocidal activity

Preparation, characterization and antibacterial mechanism of the chitosan coatings modified by Ag/ZnO microspheres

Complications of Antibiotic Therapy and Introduction of Nanoantibiotics

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