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The interaction between lyophilized samples of ascorbic acid and Cu 2+ , Fe 3+  or Mn 2+  has been investigated by means of ESR spectroscopy. All of the three transition metal ions form complexes with vitamin C, but only in the case of Cu 2+  and Fe 3+  the interaction results in a reduction of the metal ions. Cu 2+  and ascorbic acid seem to form 2 : 1 complexes with an equilibrium constant of about K = 1 x 10 7  mol -1 . None of these metal ion complexes exhibits, however, the ESR spectrum obtained with leukemic blood.

zeitschrift für naturforschung c

On the Possible Involvement of Ascorbic Acid and Copper Proteins in Leukemia. III. ESR Investigations on the Interaction between Ascorbic Acid and Some Transition Metal Ions