Fig. 2.

TiO₂NPs and SiO₂NPs accumulation in Caco-2 and A549 cell lines exposed to 15 μg/ml and 45 μg/ml of TiO₂NPs and SiO₂NPs for 24 h, 48 h, 72 h, and 96 h. Cells were then harvested, live cells were counted, and Ti and Si content was measured in 360,000 cells (μg Ti and μg Si). Data reported as mean ± SD from three independent experiments; statistical significance of exposed cells vs. control cells for p value < 0.05 (< 0.05*, < 0.01**, and < 0.005***)