Electron carriers may have an order of increasing EV Table 18-2 Standard reduction potentials for respiratory chain and related electron carriers Redox reaction (half-reaction) E0( 2H++2e 0.414 NAD++H++2e NADH 0.320 NADP++h++2e NADPH nAdH dehydrogenase(FMN)+ 2H++2e NADH dehydrogenase(FMNH2) 0.30 Ubiquinone +2H++ 2e ubiquinol 0045 Cytochrome b(Fe3+)+e cytochrome b(Felt) 0.077 Cytochrome C1(Fe 3+)+e cytochrome C1(Fe2+) Cytochrome c(Fe3+)+e cytochrome c(Fe2+) 0.254 Cytochrome a(Fe3+)+e cytochrome a(Fe2+) 0.29 Cytochrome a3 (Fe3+)+e cytochrome a3(Fe2t) 0.55 4O2+2H++2e HO 0.816Electron carriers may have an order of increasing E`0