Fig. 2.

Cytotoxicity of TiNT and TiO₂. Caco-2 cells were treated with nanotubes and titanium dioxide in different concentrations for 120 min, and their viability was determined by MTT tests. Untreated control was considered as 100%, and data are expressed as the percentage of untreated control. Positive control, 2% Triton X-100 solution. There were no significant differences among TiNT- and TiO₂-treated samples (p > 0.05), while Triton X-100 exerted complete cell death (p < 0.05). Data are means of three independent experiments ± SD