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Opto-electronic and antibacterial activity investigations of mono-dispersed nanostructure copper oxide prepared by a novel method: reduction of reactive oxygen species (ROS)

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Abstract

A novel approach for synthesis of copper oxide nanoparticles is reported by separation of nucleation and growth. The nano-material was characterized by X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and UV–Vis diffuse reflectance spectroscopy, transmission electron microscopy, atomic force microscopy, and Brunauer–Emmett–Teller analyses. Optical analysis of mono-dispersed nanostructure copper oxide by UV–Vis diffused reflectance spectroscopy showed the band gap value of 1.47 eV with a blue-shift in the optical band gap due to quantum confinement effect. The dynamic light scattering and zeta potential results showed fairly narrow size distribution and colloidal stability. The results showed that nano-particles were mono-dispersed spheres of 8 nm with no aggregation. Cell viability of treated murine fibroblast cell line (L-929) treated by different concentrations of nanoparticles showed significant viability up to 96% at concentrations 15 and 30 μg ml−1. The nanoparticles exhibited outstanding and stable antibacterial activity against Staphylococcus aureus ATCC 6538 at 30 µg ml−1. The viability and reactive oxygen species (ROS) generation in the L-929 cell line indicated that the nanoparticles were not toxic at the concentrations which were effective on bacteria. ROS analysis using DCFH-DA probe on L-929 were exposed to 7.5–60 μg ml−1 of copper oxide nanoparticles in 6 h revealed ROS generation was decreased dramatically compare to the untreated cells and positive control.

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Acknowledgements

The authors wish to thank the University of Isfahan for support of this work. A special thanks to Dr. Fereshteh Jabalameli; jabalamf@tums.ac.ir and Dr. Mohammad Emaneini; emaneini@tums.ac.ir, Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, for their gracious gift of Staphylococci isolates which were used in this investigation. Moreover, the authors gratefully acknowledge the Fahimdokht Mokhtari; mfahimdokht@gmail.com, Faculty of Food Industry and Agriculture, Department of Microbiology, Standard Research Institute (SRI) for providing the ATCC standard bacterial strains.

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Authors and Affiliations

  1. Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, 81746-73441, Iran

    Zahra Assadi & Ali Zarrabi

  2. Department of Biology, University of Isfahan, Isfahan, 81746-73441, Iran

    Giti Emtiazi

Authors
  1. Zahra Assadi
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  2. Giti Emtiazi
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  3. Ali Zarrabi
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Correspondence to Giti Emtiazi.

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Assadi, Z., Emtiazi, G. & Zarrabi, A. Opto-electronic and antibacterial activity investigations of mono-dispersed nanostructure copper oxide prepared by a novel method: reduction of reactive oxygen species (ROS). J Mater Sci: Mater Electron 29, 1798–1807 (2018). https://doi.org/10.1007/s10854-017-8088-7

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  • DOI: https://doi.org/10.1007/s10854-017-8088-7

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