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- W1988304291 abstract "Dehydro-L-ascorbic acid (DAA) exists mainly in its C2 hydrated bicyclic form (5) in an aqueous solution, and monocyclic DAA (3), which is the expected reaction product immediately after the oxidation of AA, has not been observed by NMR spectroscopy. The formation mechanism for 5 from 3 and the stability of 5 were examined by the semi-empirical molecular orbital method (MOPAC). It was indicated that the protonation reaction was the key step in the formation of 5, therefore, the formation of 5 is thought to be more difficult under physiological conditions which mostly involve in the neutral or slightly alkaline state. However, by NMR, it was confirmed that, even in a neutral or slightly alkaline state very close to physiological conditions, the predominant form of DAA existing in an aqueous solution immediately after the enzymatic oxidation of AA was confirmed to be 5, although the possible existence of other forms of DAA at very low concentrations could not be completely excluded." @default.
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- W1988304291 date "2000-01-01" @default.
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- W1988304291 title "Chemical characteristics of dehydro-<scp>L</scp>-ascorbic acid" @default.
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- W1988304291 doi "https://doi.org/10.1271/bbb.64.1651" @default.
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