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The structures of ascorbic acid (AscH2), ascorbate anion (AscH−) and its main oxidation products: ascorbyl radical in protonated and deprotonated forms (AscH• or Asc•−) and dehydroascorbate (DHA) [31,32]. The metal binding site of ascorbic acid consists of the two –OH groups (one, 2-OH on the right hand site and the other 3-OH on the left hand site of the ring structure of AscH2) [32].
