Effect of magnetite nanoparticles on living rate of MCF-7 human breast cancer cells.

Superparamagnetic and ferromagnetic magnetite nanoparticles, with diameters of approximately 13 and 44 nm, respectively, were synthesized and their uptake amount and heating efficiency were evaluated for application to magnetic hyperthermia. Both nanoparticles had almost the same zeta-potential (+10.2 mV) and hydrodynamic size (∼1 μm) and there was no significant difference in their uptake amount 18 h after they were added to the medium.