Dynamic affinity between dissociable coenzyme and immobilized enzyme in an affinity chromatographic reactor with single enzyme

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Abstract
The affinity chromatographic reactor (ACR) is a bioreactor which utilizes the dynamic interaction or the dynamic affinity between a free coenzyme and immobilized enzymes for the highly efficient regeneration of dissociable coenzymes. Dynamic affinity between free NAD and immobilized alcohol dehydrogenase (ADH) in ACR was investigated by three different methods. ADH catalyzed both oxidation and reduction of NAD, consuming propionaldehyde and ethanol. The theoretical model under consideration elucidated a criterion for the expression of the dynamic affinity as a relationship among the affinity constants and the concentrations of a coenzyme and immobilized enzyme. This criterion was confirmed experimentally by the measurements of the retention time of NAD and the half‐life period of the reactor activity after one‐shot pulse injection of NAD to ACR. In the stability measurement of the immobilized enzyme, it became clear that ADH was more stable at the higher concentration in immobilization. Although the present case of coenzyme cycling by a single enzyme is very special, with limited chance for the direct application, the results obtained here provide a theoretical basis for ACR with multienzymes–which is of more general use.

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