Author
Ahmad Reza Shahverdi
Other affiliations: University of Tehran
Bio: Ahmad Reza Shahverdi is an academic researcher from Tehran University of Medical Sciences. The author has contributed to research in topics: Antibacterial activity & Silver nanoparticle. The author has an hindex of 40, co-authored 149 publications receiving 6395 citations. Previous affiliations of Ahmad Reza Shahverdi include University of Tehran.
Papers published on a yearly basis
Papers
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TL;DR: The synthesis of metallic nanoparticles of silver using a reduction of aqueous Ag(+) ion with the culture supernatants of Klebsiella pneumoniae is reported on and their part in increasing the antimicrobial activities of various antibiotics against Staphylococcus aureus and Escherichia coli is evaluated.
1,192 citations
TL;DR: This paper reports on the rapid synthesis of metallic nanoparticles of silver using the reduction of aqueous Ag+ ion using the culture supernatants of Klebsiella pneumonia, Escherichia coli, and Enterobacter cloacae and revealed that this method of synthesis requires far less time than previously published biological methods.
655 citations
TL;DR: The enhancing effect of ZnO nanoparticles on the antibacterial activity of ciprofloxacin was concentration-dependent against all test strains and the most enhancing activities were observed in the contents of the 2000 microg/disk.
Abstract: Nanoparticle metal oxides offer a wide variety of potential applications in medicine due to the unprecedented advances in nanobiotechnology research. In this work, the effect of zinc oxide (ZnO) nanoparticles prepared by mechano-chemical method on the antibacterial activity of different antibiotics was evaluated using disk diffusion method against Staphylococcus aureus and Escherichia coli. The average size of ZnO nanoparticles was between 20 nm and 45 nm. Although ZnO nanoparticles (500 microg/disk) decreased the antibacterial activity of amoxicillin, penicillin G, and nitrofurantoin in S. aureus, the antibacterial activity of ciprofloxacin increased in the presence of ZnO nanoparticles in both test strains. A total of 27% and 22% increase in inhibition zone areas was observed for ciprofloxacin in the presence of ZnO nanoparticles in S. aureus and E. coli, respectively. The enhancing effect of this nanomaterial on the antibacterial activity of ciprofloxacin was further investigated at three different contents (500, 1000, and 2000 microg/disk) against various clinical isolates of S. aureus and E. coli The enhancing effect of ZnO nanoparticles on the antibacterial activity of ciprofloxacin was concentration-dependent against all test strains. The most enhancing activities were observed in the contents of the 2000 microg/disk.
219 citations
TL;DR: Lower cytotoxicity of the biogenic Se NPs on MCF-7 cell line was confirmed and data obtained from reducing power assay revealed higher electron-donating activity of SeO2 compared to SeNPs, while the obtained results showed that, at the same concentration of 200μg/mL, Se Nps and SeO 2 represented scavenging activity.
197 citations
TL;DR: The wet heat sterilization process can be used successfully to recover elemental selenium from bacterial cells, and no chemical changes occurred in seenium nanoparticles during the wet heat Sterilization process.
177 citations
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Journal Article•
28,685 citations
TL;DR: Findings suggest that, at least in part, the encountered beneficial effects of essential oils are due to prooxidant effects on the cellular level.
6,174 citations
TL;DR: Silver nanoparticles have emerged up with diverse medical applications ranging from silver based dressings, silver coated medicinal devices, such as nanogels, nanolotions, etc, due to its capability of modulating metals into their nanosize.
5,014 citations
TL;DR: This review presents an overview of silver nanoparticles (Ag NPs) preparation by green synthesis approaches that have advantages over conventional methods involving chemical agents associated with environmental toxicity.
3,290 citations