Fig. 3From: Evaluation of antimicrobial and cytotoxic effects of Echinacea and Arctium extracts and Zataria essential oilCell viability after treatment with Echinacea and Arctium extracts and the formulation after 24 and 48 h. A The HDFa cells viability of Echinacea purpurea: There were no significant differences with the control group for 0.312 mg/ml concentrations and lower after 24 h (p > 0.05). This threshold for an incubation time of 48 h would be 0.625 mg/ml. B The HEK cells viability of Echinacea purpurea: There were no significant differences with the control group for the concentrations of 0.625 mg/ml and lower after 24 h (p > 0.05). This threshold for an incubation time of 48 h would be 0.156 mg/ml. C The HDFa cells viability of Arctium lappa: There were no significant differences with the control group for 1.25 mg/ml and lower after 24 h (p > 0.05). This threshold for an incubation time of 48 h would be 2.5 mg/ml. D The HEK cells viability of Arctium lappa: There were no significant differences with the control group for all tested concentrations after 24 or 48 h (p > 0.05)Back to article page