Table 1. Cell viability of Raw 264.7 cells after SPIO nanoparticle uptake.

	0 mg Fe/mL	0.5 mg Fe/mL	1 mg Fe/mL	2 mg Fe/mL
10 mins	86±2%	87±2%	85±2%	86±1%
20 mins	86±2%	91±3%	87±2%	84±2%
30 mins	85±2%	86±1%	84±1%	82±2%