Fig. 4
From: Impact of in vitro digested zinc oxide nanoparticles on intestinal model systems
Zinc content of apical and basolateral supernatants of Caco-2 monocultured (a) and Caco-2/HT29-MTX cocultured cells (b) after 24 h of treatment with digested ZnO NP (< 50 nm and < 100 nm) and ZnCl2 compared to the stock dispersions. Data are expressed as mean + SD; n = 5. Significant differences between the amounts of zinc before (stock) and after incubation (apical + basolateral; *P ≤ 0.05; **P ≤ 0.01; ***P ≤ 0.001) were obtained by using the unpaired t test