Russian Journal of Physical Chemistry A

, Volume 91, Issue 5, pp 936–945 | Cite as

Copper, gold, and silver decorated magnetic core–polymeric shell nanostructures for destruction of pathogenic bacteria

  • Mohsen Padervand
  • Ahmad Kiani Karanji
  • Mohammad Reza Elahifard
Physical Chemistry of Nanoclusters and Nanomaterials


Fe3O4 magnetic nanoparticles (MNPs) were prepared by co-precipitation method. The nanoparticles were silica coated using TEOS, and then modified by the polymeric layers of polypropylene glycol (PPG) and polyethylene glycol (PEG). Finally, the core-shell samples were decorated with Ag, Au, and Cu nanoparticles. The products were characterized by vibrating sample magnetometry (VSM), TGA, SEM, XRD, and FTIR methods. The antibacterial activity of the prepared samples was evaluated in inactivation of E. coli and S. aureus microorganisms, representing the Gram-negative and Gram-positive species, respectively. The effect of solid dosage, bacteria concentration and type of polymeric modifier on the antibacterial activity was investigated. TEM images of the bacteria were recorded after the treatment time and according to the observed changes in the cell wall, the mechanism of antibacterial action was discussed. The prepared nanostructures showed high antibacterial activity against both Gram-negative and Gram-positive bacteria. This was due to the leaching of metal ions which subsequently led to the lysis of bacteria. A theoretical investigation was also done by studying the interaction of loaded metals with the nucleotide components of the microorganism DNA, and the obtained results were used to explain the experimental data. Finally, based on the observed inactivation curves, we explain the antibacterial behavior of the prepared nanostructures mathematically.


antibacterial activity S. aureus E. coli core-shell nanocomposites PPG PEG 


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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • Mohsen Padervand
    • 1
  • Ahmad Kiani Karanji
    • 2
  • Mohammad Reza Elahifard
    • 3
  1. 1.Faculty of Science, Department of ChemistryUniversity of MaraghehMaragheh, TabrizIran
  2. 2.Department of ChemistrySharif University of TechnologyTehranIran
  3. 3.Faculty of Engineering, Chemical Engineering DepartmentArdakan UniversityArdakanIran

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