Fig. 4
From: Anti-dengue virus serotype 2 activity of tannins from porcupine dates
Cytotoxicity effect of porcupine dates extracts and tannic acids on Vero cells. The methanol crude extracts (MBD and MPD) and tannic acid reference compounds (FT and ST) were evaluated at concentration of 200 µg/mL down to 0.195 µg/mL, while BDTF and PDTF were evaluated at concentration of 164 µg/mL down to 0.195 µg/mL. Vero cells were incubated with various concentrations of extracts or tannic acids for 48 h at 37 °C. After that, cell viability was assessed by MTT assay. Values represent the mean of duplicate assays ± SEM