On the Reducing Power of Glutathione and Cysteine

Abstract
Cysteine and glutathione reduce indigo-carmine in the absence of O, the reduction becoming more rapid as the amount of O present is reduced; but fairly large amounts of O accelerate the reduction. This last is attributed to the formation of H2O2 during the autoxidation of the -SH group; previous treatment of indigo carmine with H2O2 was followed by an acceleration in its reduction. The work of Kendall and Nord is criticized.

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