| abstract |
The present invention relates to a method for producing C4 bodies, preferably butyric acid and/or butanol, comprising the steps contacting an aqueous medium comprising an acetogenic bacterial cell in an aqueous medium with syngas and incubating the mixture obtained in step a) at a temperature between 0 and 100 °C for at least 30 minutes, wherein the aqueous medium comprises, in step b), ethanol and/or acetate at a total combined concentration is at least 0.1 g L -1 . |