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Apoptosis and inhibition of human epithelial cancer cells by ZnO nanoparticles synthesized using plant extract

  • Koutu, Vaibhav (Nanotechnology Research Laboratory, Department of Physics and Nanoscience & Engineering, Maulana Azad National Institute of Technology) ;
  • Rajawat, Shweta (Nanotechnology Research Laboratory, Department of Physics and Nanoscience & Engineering, Maulana Azad National Institute of Technology) ;
  • Shastri, Lokesh (Nanotechnology Research Laboratory, Department of Physics and Nanoscience & Engineering, Maulana Azad National Institute of Technology) ;
  • Malik, M.M. (Nanotechnology Research Laboratory, Department of Physics and Nanoscience & Engineering, Maulana Azad National Institute of Technology)
  • Received : 2018.04.23
  • Accepted : 2019.06.19
  • Published : 2019.07.25

Abstract

The present research work reports in-vitro anti-cancer activity of biologically synthesized ZnO nanoparticles (ZnO NPs) against human carcinoma cells viz SCC-40, SK-MEL-2 and SCC-29B using Sulforhodamine-B (SRB) Assay. ZnO NPs were synthesized by a unique and novel biological route using Temperature-gradient phenomenon where the extract of combination of Catharanthus roseus (L.) G. Don (C. roseus), Azadirachta indica (A. indica), Ficus religiosa (F. religiosa) and NaOH solution were used as synthesis medium. The morphology of the ZnO NPs was characterized by Transmission Electron Microscopy (TEM). TEM images reveal that particle size of the samples reduces from 76 nm to 53 nm with the increase in reaction temperature and 68 nm to 38 nm with the increase in molar concentration of NaOH respectively. XRD study confirms the presence of elements and reduction in crystallite size with increase in reaction temperature and NaOH concentration. The diffraction peaks show broadening and a slight shift towards lower Bragg angle ($2{\theta}$) which represents the reduction in crystallite size as well as presence of uniform strain. The FTIR spectra of the extract show transmittance peak fingerprint of Zn-O bond and presence of bioactive molecules These NPs exhibit inhibition greater than 50% for SCC-40, SK-MEL-2 and SCC-29B cell lines and more than 50% cell kill for SCC-29B cells at concentrations < $80{\mu}g/ml$. Nanoparticles with smallest size have shown better anti-cancer activity and peculiar cell-selectivity. The combination of extracts of these plants with ZnO NPs can be used in targeted drug delivery as an effective anti-cancer agent, a potential application in cancer treatment.

Keywords

References

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