Figure 3From: Minimization of free radical damage by metal catalysis of multivitamin/multimineral supplements AAOS slows both iron- and copper-catalyzed oxidation of ascorbate, compared to their sulfate forms. Loss of ascorbate free radical vs. time in different environments. Aqueous solutions (20 mM HEPES pH 7.2) contained 2.0 mM ascorbic acid. Panel A - FeSO4 (0.45 mM); Panel B - CuSO4 (0.39 mM).Back to article page