Figure 4.

Viability of monocytes in presence of aqueous extracts of Abelmoschus esculentus, Hibiscus acetosella, Manihot esculenta and Pteridium aquilinum, measured by exclusion test with Trypan blue. The cells (10⁶/mL HBSS) were incubated for 45 min with not heated extract solutions at the final concentration of 100 μg/mL at 37 °C, in the dark. The cell population before test (blue histogram) was set as reference (100%). For the control cells (black histogram), ultra pure water was used instead of the extract solutions. The values are presented as average of the relative percentage vs. Ctrl ± standard deviation (SD). Abel = Abelmoschus, Hib = Hibiscus, Man = Manihot and Pter = Pteridium.