Fig. 2
From: Zinc-metal–organic frameworks with tunable UV diffuse-reflectance as sunscreens
Toxicity on HaCaTs and HEKas. A Cytotoxicity of TiO2, ZnO and ZIF-8 at various concentrations toward HaCaTs and HEKas using MTT assay. B Digital images of HaCaTs and HEKas after treatment with TiO2, ZnO or ZIF-8. C Nucleus images with DAPI staining after cells were treated with TiO2, ZnO or ZIF-8. Obvious chromatin condensation was observed for ZnO-treated cells. D Flow cytometry analysis of cell apoptosis induced by TiO2, ZnO and ZIF-8