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Fig. 5 | Biotechnology for Biofuels

Fig. 5

From: Enhanced direct fermentation of cassava to butanol by Clostridium species strain BOH3 in cofactor-mediated medium

Fig. 5

Comparison of intracellular NADH and NADPH levels and butanol production by altering l-tryptophan level. The extent of anaerobic growth is indicated where one “+” refers to an OD600 of around 1.6–2.0 in cultures. Changes in activities were observed for butyraldehyde dehydrogenase (BADH) or butanol dehydrogenase (BDH) which requires redox cofactors (NADH and NADPH) during butanol synthesis. Redistributed carbon flux to butanol in terms of butnaol–biosolvent ratio and butanol–bioacid ratio was specified in the table at the bottom by manipulating l-tryptophan levels

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