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Oxidation and Reduction

Oxidation and Reduction. as it pertains to biochemistry. please read . Read The Slow Burn. fig 13-22. fig 13-22. reduction potential can be measured. ref. cell. test cell. fig 13-23. Redox reactions as pairs of half-reactions. Fe 3+ + Cu +. Fe 2+ + Cu 2+.

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Oxidation and Reduction

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  1. Oxidation and Reduction as it pertains to biochemistry

  2. please read Read The Slow Burn

  3. fig 13-22

  4. fig 13-22

  5. reduction potential can be measured ref. cell test cell fig 13-23

  6. Redox reactions as pairs of half-reactions Fe3+ + Cu+ Fe2+ + Cu2+ The half-reactions: Cu2+ + e- Cu+ E'o = -.18 Fe3+ + e- Fe2+ E'o = .77 always reductions! rh

  7. Energetics calculated from half-reactions Fe3+ + Cu+ Fe2+ + Cu2+ what is E'o for this reaction ? Cu2+ + e- Cu+ E'o =.18 Fe3+ + e- Fe2+ E'o = .77 Fe3+ + Cu+ Fe2++ Cu2+ E'o = (.18 +.77) rh

  8. rh

  9. relationship between free energy and reduction potential DG'o = -nFE'o one confusing thing: by the convention, positive E means spontaneous reaction… or negative DG. rh

  10. Energetics calculated from half-reactions Fe3+ + Cu+ Fe2+ + Cu2+ what is E'o for this reaction ? Cu2+ + e- Cu+ E'o = .18 Fe3+ + e- Fe2+ E'o = .77 Fe3+ + Cu+ Fe2++ Cu2+ E'o = 0.95 rh

  11. nFE'o DG'o = -nFE'o rh

  12. Fe2+ + Cu2+ Fe3+ + Cu+ familiar from earlier chemistry classes… BUT WHAT ABOUT SOMETHING LIKE THIS?: glucose rh

  13. Oxidation of a "model" sugar molecule:CH2O glucose general: let's make n=1, to aid understanding rh

  14. Oxidation of a "model" sugar molecule:CH2O 1) removal of electrons from sugar rh

  15. Oxidation of a "model" sugar molecule:CH2O 2) reduction of oxygen rh

  16. Oxidation of a "model" sugar molecule:CH2O 3) production of CO2 rh

  17. Table of Standard Reduction Potentials TOP MIDDLE BOTTOM

  18. NAD+ and NADH fig 13-24

  19. The business end of NAD and NADP this moiety is from the vitamin niacin rh

  20. moi·e·ty (moi-t)n.One of two or more parts into which something may be divided, such as the various parts of a vitamin or molecule. ? this moiety is from the vitamin niacin rh

  21. table 13-8

  22. FAD and FADH2 (and FMN and FMNH2) fig 13-27

  23. isoalloxazine ring The business end of FAD or FMN this moiety is from the vitamin riboflavin rh

  24. fig 13-9

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