Summary
Phosphoric acid greatly augments the antioxygenic activity of hydroquinones and tocopherols and their corresponding quinones in autoxidizing fats. In such media,p-quinones are partly reduced to hydroquinones. Phosphoric acid promotes this reaction and thus enhances, in a synergistic manner, the antioxygenic activity of both quinones and hydroquinones. With tocoquinones, cyclization as well as reduction occurs, and tocopherol is thereby regenerated.
The results suggest that a hydroquinone ⇄ quinone system is set up upon the addition of either the oxidant or the reductant to an autoxidizing fat, and that the resulting equilibrium is shifted in favor of the reductant by phosphoric acid.
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Presented in part before the Division of Food and Agricultural Chemistry, American Chemical Society meeting, St. Louis, Missouri 1941.
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Golumbic, C. The antioxygenic action of phosphoric acid in association with tocopherols and hydroquinones. Oil Soap 19, 181–182 (1942). https://doi.org/10.1007/BF02545442
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DOI: https://doi.org/10.1007/BF02545442