Figure 4From: Comparative absorption, distribution, and excretion of titanium dioxide and zinc oxide nanoparticles after repeated oral administration Concentration of Ti in tissues after 13 weeks of consecutive oral administration of TiO 2 nanoparticles. The concentrations of Ti in the liver (A), spleen (B), kidney (C), and brain (D) were evaluated using an ICP-MS. Values are mean ± S.D. and n = 11. Significance versus vehicle control: * p < 0.05.Back to article page