Fig. 6

(a) Dose-dependent DPPH (%) radical scavenging activity of O. ramonense plant extracts obtained using different solvents (hot water, methanol/water, methanol); (b) Dose-dependent DPPH (%) radical scavenging activity of O. ramonense plant extracts obtained using different solvents (ethyl acetate and dichloromethane/methanol) ; (c) Dose-dependent standard gallic acid reference curve used to compute the quantity of phenolic content in the plant extracts (mg of gallic acid equivalent (GAE)/gram of dry weight plant). The Pearson correlation coefficients (r) obtained from the graphs are greater than 0.9 for all solvents. The samples were analyzed in triplicates.