Silica-modified Fe-doped calcium sulfide nanoparticles for in vitro and in vivo cancer hyperthermia

Steven Yueh Hsiu Wu, Kai Chiang Yang, Ching Li Tseng, Jung Chih Chen, Feng Huei Lin

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


In this study, sulfide-based magnetic Fe-doped CaS nanoparticles modified with a silica layer were investigated for cancer hyperthermia. A polyvinyl pyrrolidone polymer was used as the coupling agent. The developed nanoparticles contained 11.6 wt% iron concentration, and their X-ray diffraction pattern was similar to those of CaS and Fe-CaS nanoparticles. The average particle size was approximately 47.5 nm and homogeneously dispersed in aqueous solutions. The major absorption bands of silica were observed from the FTIR spectrum. The magnetic properties and heating efficiency were also examined. The specific absorption ratio of nanoparticles at a concentration of 10 mg/mL at 37°C in an ethanol carrier fluid was 37.92 W/g, and the nanoparticles would raise the temperature to over 45°C within 15 min. A cytotoxicity analysis revealed that the nanoparticles had good biocompatibility, which indicated that the nanoparticles did not affect cell viability. The therapeutic effects of the nanoparticles were investigated using in vitro and animal studies. Cells seeded with nanoparticles and treated under an AC magnetic field revealed a percentage of cytotoxicity (60%) that was significantly higher from that in other groups. In the animal study, during a hyperthermia period of 15 days, tumor-bearing Balb/c mice that were subcutaneously injected with nanoparticles and exposed to an AC magnetic field manifested a reduction in tumor volume. The newly developed silica-modified Fe-CaS nanoparticles can thus be considered a promising and attractive hyperthermia thermoseed.

Original languageEnglish
Pages (from-to)1139-1149
Number of pages11
JournalJournal of Nanoparticle Research
Issue number3
Publication statusPublished - Mar 2011
Externally publishedYes


  • Calcium sulfide
  • Hyperthermia
  • Iron-doped magnetic nanoparticles
  • Nanomedicine
  • Silica
  • Surface modification
  • Targeted tumor

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Modelling and Simulation
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering


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