what is the overall free energy change under standard conditions for the passage of two electrons from β-hydroxybutyrate to oxygen through passage through the electron transfer chain?

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what is the overall free energy change under standard conditions for the passage of two electrons from β-hydroxybutyrate to oxygen through passage through the electron transfer chain?

Standard Reduction Potentials of Some
Biologically Important Half-Reactions
Half-reaction
E° (V)
½ 02 + 2H* +2e → H20
0.816
Fe+ + e Fe2+
0.771
NO, + 2H* + 2e NO, + H,0
0.421
Cytochrome f (Fe)+ e
cytochrome f (Fe2+)
0.365
Fe(CN) (ferricyanide) + e
Cytochrome a, (Fe*) + e
cytochrome a, (Fe2*)
0, + 2H +2e H,02
Cytochrome a (Fe*) + e
cytochrome a (Fe2+)
Cytochrome c (Fe)+ e
cytochrome c (Fe2+)
Fe(CN)-
0.36
0.35
0.295
0.29
0.254
Cytochrome c, (Fe+) + e-
cytochrome c, (Fe2+)
Cytochrome b (Fet) + e
cytochrome b (Fe2+)
Ubiquinone + 2H* + 2e
Fumarate?- + 2H* + 2e
2H* + 2e H2 (at standard conditions, pH 0)
0.22
0.077
ubiquinol
0.045
succinate?-
0.031
0.000
Crotonyl-CoA + 2H* + 2e.
Oxaloacetate?-+ 2H +2e
→butyryl-CoA
malate?-
-0.015
-0.166
Pyruvate + 2H* + 2e lactate
-0.185
Acetaldehyde+ 2H* + 2e
ethanol
-0.197
FAD + 2H* + 2e
FADH2
-0.219
Glutathione + 2H* + 2e
2 reduced glutathione
S+ 2H* + 2e H,S
-0.23
-0.243
Lipoic acid + 2H +2e dihydrolipoic acid
NAD+ + Ht + 2e NADH
-0.29
-0.320
NADP* + H* + 2e NADPH
-0.324
Acetoacetate + 2H* + 2e-
B-hydroxybutyrate
-0.346
a-Ketoglutarate + CO, + 2H + 2e
isocitrate
-0.38
2H* + 2e-H2 (at pH 7)
-0.414
Ferredoxin (Fe3+) + e ferredoxin (Fe?+)
-0.432
Source: Data mostly from R. A. Loach, in Handbook of Biochemistry and Molecular
Biology, 3rd edn (G. D. Fasman, ed.), Physical and Chemical Data, Vol. 1, p. 122,
CRC Press, 1976.
*This is the value for free FAD; FAD bound to a specific flavoprotein (e.g., succinate
dehydrogenase) has a different E" that depends on its protein environment.
Transcribed Image Text:Standard Reduction Potentials of Some Biologically Important Half-Reactions Half-reaction E° (V) ½ 02 + 2H* +2e → H20 0.816 Fe+ + e Fe2+ 0.771 NO, + 2H* + 2e NO, + H,0 0.421 Cytochrome f (Fe)+ e cytochrome f (Fe2+) 0.365 Fe(CN) (ferricyanide) + e Cytochrome a, (Fe*) + e cytochrome a, (Fe2*) 0, + 2H +2e H,02 Cytochrome a (Fe*) + e cytochrome a (Fe2+) Cytochrome c (Fe)+ e cytochrome c (Fe2+) Fe(CN)- 0.36 0.35 0.295 0.29 0.254 Cytochrome c, (Fe+) + e- cytochrome c, (Fe2+) Cytochrome b (Fet) + e cytochrome b (Fe2+) Ubiquinone + 2H* + 2e Fumarate?- + 2H* + 2e 2H* + 2e H2 (at standard conditions, pH 0) 0.22 0.077 ubiquinol 0.045 succinate?- 0.031 0.000 Crotonyl-CoA + 2H* + 2e. Oxaloacetate?-+ 2H +2e →butyryl-CoA malate?- -0.015 -0.166 Pyruvate + 2H* + 2e lactate -0.185 Acetaldehyde+ 2H* + 2e ethanol -0.197 FAD + 2H* + 2e FADH2 -0.219 Glutathione + 2H* + 2e 2 reduced glutathione S+ 2H* + 2e H,S -0.23 -0.243 Lipoic acid + 2H +2e dihydrolipoic acid NAD+ + Ht + 2e NADH -0.29 -0.320 NADP* + H* + 2e NADPH -0.324 Acetoacetate + 2H* + 2e- B-hydroxybutyrate -0.346 a-Ketoglutarate + CO, + 2H + 2e isocitrate -0.38 2H* + 2e-H2 (at pH 7) -0.414 Ferredoxin (Fe3+) + e ferredoxin (Fe?+) -0.432 Source: Data mostly from R. A. Loach, in Handbook of Biochemistry and Molecular Biology, 3rd edn (G. D. Fasman, ed.), Physical and Chemical Data, Vol. 1, p. 122, CRC Press, 1976. *This is the value for free FAD; FAD bound to a specific flavoprotein (e.g., succinate dehydrogenase) has a different E" that depends on its protein environment.
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