Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Differential Effects of Cysteine and Histidine-Capped ZnS:Mn Nanocrystals on Escherichia coli and Human Cells

  • Received : 2010.08.16
  • Accepted : 2010.10.21
  • Published : 2011.01.20
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Abstract

Cysteine and histidine-capped water-dispersible ZnS:Mn nanocrystals (ZnS:Mn-Cys and ZnS:Mn-His) were synthesized and their effects on E. coli and human cells were investigated. Particle sizes of these nanocrystals were found from HR-TEM images to be 3.5 nm and 4.0 nm, respectively. Their solution photoluminescence spectra showed identical broad emission peaks at 580 nm. ZnS:Mn-His significantly suppressed the growth of E. coli at $100{\mu}g/mL$ and 1 mg/mL concentrations, something not observed with ZnS:Mn-Cys. Consistent with this, greater inhibition of cell proliferation and viability were observed in HEK293 and IMR90 cells in ZnS:Mn-His at $100{\mu}g/mL$ and 1 mg/mL concentrations.

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