Figure 3. The highest rates of multiple turnover ascorbate consumption and radical generation were found for M-chelates with biologically relevant reduction potentials (19). A, Ascorbate consumption by M-chelate/H2O2. B, Ascorbate consumption by M-chelate/O2. C, Radical generation by M-chelate/H2O2. D, Radical generation by M-chelate/O2. The reduction potentials for the H2O2/hydroxyl radical (E° = +380 mV) and ascorbyl radical/ascorbate (E° = -66 mV) half reactions are shown by the dashed lines.
