Abstract
OUR recent work1 on oxygen absorption of acid vitamin C solutions suggested the existence of the oxidized form: vitamin + ½ O, or vitamin — H. This form corresponds to the first step of the reversible oxidation of the vitamin, deshydroascorbic acid being the second. New evidence corroborates the duality of the reversibly oxidized forms of vitamin C. Phosphomolybdic acid (P2O5(MoO3)24 + 16 H2O) mixed with an acid solution of vitamin C develops a blue or a green colour. The blue colour reaches its maximum intensity when the ratio approaches 176/3000. This colour fades when the quantity of the oxidizer, the phos-phomolybdic acid, is diminished, and turns green when it increases.
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Bezssonoff, N., et Woloszyn Mme. M., C.R. Soc. Biol., 122, 941 (1936); C.R. Acad. Sci. 203, 275 (1936).
Pointed out first by Bezssonoff, C.R. Acad. Sci., 180, 970 (1925).
Ettori, C.R. Acad. Sci., 202, 852 (1936).
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BEZSSONOFF, N., WOLOSZYN, M. Duality of the Reversibly Oxidized Forms of Vitamin C and the Polarization of its Dienol Group. Nature 139, 469 (1937). https://doi.org/10.1038/139469a0
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DOI: https://doi.org/10.1038/139469a0
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