Metabolism and Excretion

As shown in Figure 1, oxidation of ascorbic acid proceeds by a one-electron process, forming mono-dehydroascorbate, which disproportionates to ascor-bate and dehydroascorbate. Most tissues also contain monodehydroascorbate reductase (EC 1.6.5.4), a flavoprotein that reduces the radical back to ascorbate. Dehydroascorbate is reduced to ascorbate by dehydroascorbate reductase (EC 1.8.5.1), a glutathione-dependent enzyme; little is oxidized to diketogulonic acid in human beings.

dehydroascorbate reductase

dehydroascorbate reductase

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Low Carb Diets Explained

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