Fig. 6.
Possible mechanisms involved in enzymatic antioxidant status. ROS = reactive oxygen species; AOX = antioxidant compounds; M+ x = metallic ions; SOD = superoxide dismutase; GPx = glutathione peroxidase. Possible actions of the bioactive compounds: they may avoid formation of ROS (green arrow) or chelate metals ions (red arrow) and, thus, antioxidant enzymes (SOD and GPx) may be spared.