チオ尿素のアスコルビン酸酸化抑制機構に関する研究-1-

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The mechanism by which the ascorbic acid is stabilized in the aqueous solution with thiourea was studied. The most effective amount of thiourea added in the ascorbic acid solution was in the same molar ratio as the latter, and the order of the antioxidative effect for ascorbic acid of thiourea and its phenyl derivatives was as follows: N-phenyl->Syn-diphenyl->thiourea>bis-(m-hydroxyphenyl)->bis-(o-hydroxyphenyl)->bis-(p-hydroxyphenyl)->tetraphenylthiourea and the last phenyl derivative had little effect on this oxidation. It was assumed from these results that the antioxidative effect of thiouroa was caused by the reduction of dehydroascorbic acid to ascorbic acid with SH form of thiourea, the tautomer of thiourea. Thiourea could form the complex with Cu, and this complex formation was confirmed by the paper chromatography.
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