Add time:09/06/2019         Source:sciencedirect.com

In this work a novel bioprocess for hydrogenation of CO2 to formate was developed, using whole cell catalysis by a sulfate-reducing bacterium. Three Desulfovibrio species were tested (D. vulgaris Hildenborough, D. alaskensis G20, and D. desulfuricans ATCC 27774), of which D. desulfuricans showed the highest activity, producing 12 mM of formate in batch, with a production rate of 0.09 mM h−1. Gene expression analysis indicated that among the three formate dehydrogenases and five hydrogenases, the cytoplasmic FdhAB and the periplasmic [FeFe] HydAB are the main enzymes expressed in D. desulfuricans in these conditions. The new bioprocess for continuous formate production by D. desulfuricans had a maximum specific formate production rate of 14 mM gdcw−1 h−1, and more than 45 mM of formate were obtained with a production rate of 0.40 mM h−1. This is the first report of a continuous process for biocatalytic formate production.

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