Cytotoxicity of ZnO NPs on Caco-2 cells. MTT assay. Cell viability of Caco-2 cells treated with different concentrations of different-sized ZnO NPs at different times. Exposure to ZnO NPs for (A) 12 h, (B) 24 h, and (C) 36 h. Results are expressed as the percentage of cell activity compared to the control. The data are presented as the mean ± SD of three independent experiments (n = 5).
Kang et al. Nanoscale Research Letters 2013 8:496 doi:10.1186/1556-276X-8-496