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OH radical oxidation of the sorbitylfurfural furanic ring to sugar derivatives induced by radiolysis in aerobic environment

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Chemical radiolytic oxidation induced by OH addition on 1-(2-furan-2-yl-5-hydroxy-6-hydroxymethyl-[1,3]dioxan-4-yl)-ethan-1,2-diol (sorbitylfurfural, SF) leads, in the presence of controlled amounts of oxygen, to a permanent functional modification of the target molecule. The yield of conversion reaches 60% of the starting material. LC-MS analysis allowed the identification, as final products, of carboxylic acids, butenal and hydroxy-furan derivatives in which the sugar chain remains unbroken, while the furanic ring is attacked first by OH and then by oxygen, giving in succession an intra-/inter-molecular rearrangement of the allylperoxyl radicals thus formed. The proposed oxidation of the furanic ring envisages the peroxyl intermediates undergoing mono- and/or bi-molecular reactions; a reaction path has been outlined and is reported here. The presence of unsaturated bonds in the final products could provide a further site for radical scavenger activity. Therefore, the fast reaction with O2 and the rearrangement of the produced peroxyl radicals to species, which are likely to be effective OH-capturers, reinforces the antioxidant ability of SF.


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