Abstract
In this study the possibility of electrochemical replacement of oxygen in one aerobic microbial transformation (conversion of d-sorbitol to l-sorbose) is checked. Two main factors are studied: the electrode potential and the time at which constant current application is replaced by aeration. It is shown that in the case considered aeration could be partially replaced by a constant electric current. The maximum effect is observed when the replacement takes place at a degree of conversion of about 0.75, i.e. when the microbial culture is in a stationary phase. During the lag phase and the exponential growth phase aeration is inevitable. The rate of conversion is quite sensitive to the electrode potential of the working electrode. However, the energetic balance shows that the effect studied cannot be explained by electrochemical cofactor regeneration.
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