Figure 3From: Comparative absorption, distribution, and excretion of titanium dioxide and zinc oxide nanoparticles after repeated oral administration Systemic absorption of nanoparticles from the gastrointestinal tract after 13 weeks of repeated oral treatment. Ti concentration in whole blood (A) showed about a 10-fold lower absorption than Zn concentration in whole blood (B) in both sexes. Values are mean ± S.D. and n = 11. Significance versus vehicle control: * p < 0.05.Back to article page