Table of standard reduction potentials for half-reactions important in biochemistry

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The values below are standard reduction potentials for half-reactions measured at 25°C, 1 atmosphere and a pH of 7 in aqueous solution.[1][2]

Half-reaction Δξ°'(V) E' Physiological conditions References and notes
CH3COOH + 2 H+ + 2 e-CH3CHO + H2O -0.58
2 H+ + 2 e- → H2 -0.42
NAD+ + H+ + 2 e- → NADH -0.320 -0.280 The ratio of NAD+:NADH is maintained at around 30:1.[3] This allows NAD+ to be used to oxidise organic molecules
NADP+ + H+ + 2 e- → NADPH -0.320 -0.370 The ratio of NADP+:NADPH is maintained at around 1:50.[3] This allows NADPH to be used to reduce organic molecules
FAD + 2 H+ + 2 e- → FADH2 (coenzyme bonded to flavoproteins) -0.04 Depending on the protein involved, the potential of the flavine can vary widely[4]
O2 + 2 H+ + 2 e-H2O2 +0.30
O2 + 4 H+ + 4 e- → 2 H2O +0.82
P680+ + e- → P680 ~ +1.0

Notes[edit]

References[edit]

  1. ^ Berg JM, Tymoczko JL, Stryer L, (2001) Biochemistry, 5th edition, WH Freeman, New York
  2. ^ Voet D, Voet JG, Pratt CW, (2013) Fundamentals of Biochemistry, 4th edition, John Wiley & Sons, New York
  3. ^ a b Huang, Haiyan; Shuning Wang; Johanna Moll; Rudolf K. Thauer (2012-07-15). "Electron Bifurcation Involved in the Energy Metabolism of the Acetogenic Bacterium Moorella thermoacetica Growing on Glucose or H2 plus CO2". Journal of Bacteriology 194 (14): 3689–3699. doi:10.1128/JB.00385-12. ISSN 0021-9193. Retrieved 2013-09-10. 
  4. ^ Buckel, W.; Thauer, R. K. (2013). "Energy conservation via electron bifurcating ferredoxin reduction and proton/Na+ translocating ferredoxin oxidation". Biochimica et Biophysica Acta (BBA) - Bioenergetics 1827 (2): 94. doi:10.1016/j.bbabio.2012.07.002.  edit