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).
Rabovsky et al. Nutrition Journal 2010 9:61 doi:10.1186/1475-2891-9-61