Concerted proton-electron transfer between ascorbic acid and cytochrome b561.

  title={Concerted proton-electron transfer between ascorbic acid and cytochrome b561.},
  author={D. Njus and V. Jalukar and J. A. Zu and Patrick M. Kelley},
  journal={The American journal of clinical nutrition},
  volume={54 6 Suppl},
  • D. Njus, V. Jalukar, +1 author Patrick M. Kelley
  • Published 1991
  • Medicine
  • The American journal of clinical nutrition
  • Ascorbic acid is an essential reductant in biology but its reducing power is paradoxical. At physiological pH the predominant form of ascorbate (the monoanion) is a poor electron donor because it oxidizes to the energetically unfavorable neutral free radical. The ascorbate dianion forms the relatively stable semidehydroascorbate radical anion and is a powerful electron donor but its concentration at neutral pH is insufficient to produce the reaction rates observed. For example, ascorbate… CONTINUE READING
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