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The redox potential of ascorbate. At the normal acidic gastric pH, secreted gastric ascorbic acid dissociates into ascorbate. Ascorbate can act as an antioxidant by reversible oxidation to DHA, and then be regenerated by glutathione-dependent DHA reductase back to ascorbate. DHA can be irreversibly oxidized to 2,3 di-keto-L-gulonic acid and thence excreted in the urine as oxalate.
