Electrochemical control of redox potential in batch cultures of Escherichia coli

Redox potential can be controlled in fermentations. Control systems for oxygen concentration using redox potential as the control variable to regulate oxygen supply have been described. Previous workers have described a pH control system based upon the production of acid and base by the electrochemical oxidation and reduction of water. This communication will describe a derivative of this electrochemical pH control system that controls the redox potential of a fermentor at low levels in the presence of high levels of oxygen.