Observations on the function of peroxidase systems and the chemistry of the adrenal cortex

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Abstract
The press juice of peroxidase plants contains a highly reducing constituent (reducing factor: R. F.). Peroxidase and H2O2 oxidize it, but no other substance is oxidized by the plant peroxidase system unless the R. F. is there in reduced form. Part of the R. F. is a hexuronic acid and has been isolated as such not only from plants but also from the adrenal cortex. M. P. 175 = 180o C. [a]D21o = +24. It reduces Fehlings solution, neutral silver, phosphotungstic acid and I in the cold. Oxidation by O is irreversible and is catalyzed by heavy metals, but dehydrogenation by such substances as quinones is reversible. Thus a definite potential is given. Oxidized hexuronic acid is reduced by animal tissues and glutathione but not by dehydrogenases of the succinoxidase type.

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