Fig. (5).

Schematic representation of typical time courses of antioxidant / antiradical assays with possible measurable quantities. a – an antioxidant assay started by addition of initiator (In) and subsequent addition of an antioxidant (AO), with measurable uninhibited (V_U) and inhibited reaction rates (V_I) and inhibition time (t_I); b – an antioxidant assay started by addition of In to the substrate pre-mixed with AO, with measurable V_I, V_U and lag-phase (t_I); c – an antiradical assay started by addition of AO to pre-formed reagent R (e.g, a stable free radical or a transition metal complex), with measurable initial rate (V) and amount of reagent which has reacted with AO ([R]_r).