Fe3O4/TiO2 core/shell magnetic nanoparticle-based photokilling of pathogenic bacteria

Wei Jen Chen, Yu-Chie Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Scopus citations


Aims: We demonstrate a photokilling approach for pathogenic bacteria using magnetic nanoparticles as photokilling nanoprobes. Materials & methods: The nanoprobes are composed of iron oxide/titania (Fe3O 4/TiO2) core/shell magnetic nanoparticles. The titanium layer on the magnetic nanoprobes plays two roles: as a photokilling agent and as an affinity substrate for pathogenic bacteria. The magnetic property of the nanoprobes allows the resultant nanoprobe-target species conjugates to be readily aggregated at a small spot under external magnetic field for conducting photokilling treatment. Therefore, damage to nontarget cells can be reduced. Results: The results show that Fe3O4/TiO2 core/shell magnetic nanoparticles do not only have the capacity to target pathogenic bacteria, including Gram-negative, Gram-positive and antibiotic-resistant bacteria, but they can also be used to effectively inhibit the cell growth of the bacteria (>99.9%) targeted by the magnetic nanoparticles under irradiation of a low-power UV lamp (λmax ∼306 nm, 0.412 mW/cm2) within 15 min. Conclusion: The potential application of this approach is in the treatment of cutaneous bacterial infections.

Original languageEnglish
Pages (from-to)1585-1593
Number of pages9
Issue number10
StatePublished - 1 Dec 2010


  • antibiotic-resistant
  • magnetic nanoparticles
  • pathogenic bacteria
  • photokilling
  • titania

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