Fig. 4
a In vitro release of ART from TA-Fe/ ART@ZIF nanoparticles in pH 7.4 and 5.0. b The cytotoxicity of ART, TA-Fe/ZIF, and TA-Fe/ART@ZIF nanoparticles in MDA-MB-231 cells at 0, 12.5, 25, 50, and 100 μg/mL. c Viability of L929 cells treated with TA-Fe/ART@ZIF at different concentrations. d Calcein-AM staining of MDA-MB-231 cells treated with TA-Fe/ART@ZIF nanoparticles at concentrations of 0, 25, 50, and 100 μg/mL