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Table 4 Reduction potentials of redox mediators

From: Redox mediators modify end product distribution in biomass fermentations by mixed ruminal microbes in vitro

Redox mediator E° (V) References
Methyl viologen −0.446 Michaelis and Hill (1933)
Neutral red −0.325 Park et al. (1999)
Safranin O −0.279 Stieliler et al. (1933)
Resazurin +0.042 Hungate (1969)
Tannins +0.571 to +0.996a Hagerman et al. (1998)
  1. aVaries with specific compound; range is at experimental pH of 6.24, similar to pH values of fermentation experiments reported here.