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pubmed-article:5801297pubmed:abstractText1. The reactions of retinol and retinoic acid with iodine were investigated since knowledge of the chemical reactions of vitamin A with acceptors of electrons may shed light on its biochemical mode of action. 2. Colloidal retinol, but not retinoic acid, reacts with iodine to yield a blue-green complex that rapidly decomposes, giving iodide and an unknown species with lambda(max.) at 870mmu. 3. In addition, both retinol and retinoic acid reduce iodine to iodide by a reaction that does not involve an intermediate coloured complex; this reaction appears to yield unstable carbonium ion derivatives of the vitamin. 4. The presence of water greatly facilitates the production of iodide from vitamin A and iodine. 5. Possible chemical pathways involved in these reactions are discussed. 6. It is suggested that the chemical properties of retinol and retinoic acid that underlie their biochemical behaviour might be apparent only when the molecules are at a lipid-water interface, and that vitamin A might be expected to react with a number of different electron acceptors in vivo.lld:pubmed
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pubmed-article:5801297pubmed:authorpubmed-author:LucyJ AJAlld:pubmed
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pubmed-article:5801297pubmed:dateRevised2010-9-13lld:pubmed
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pubmed-article:5801297pubmed:articleTitleReactions of vitamin A with acceptors of electrons. Interactions with iodine and the formation of iodide.lld:pubmed
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