초록
<P><B>Highlights</B></P><P>► <I>Alkalibaculum bacchi</I> strains CP11<SUP>T</SUP>, CP13 and CP15 make ethanol from CO, H<SUB>2</SUB> and CO<SUB>2</SUB>. ► CP11<SUP>T</SUP>, CP13 and CP15 are moderately alkaliphilic strains grow at pH about 8.0. ► CP15 is the most promising strain due to its high growth and ethanol yield. ► Ethanol yields from utilized CO by CP15 were between 65% and 76%.</P> <P><B>Abstract</B></P><P>Ethanol production from syngas using three moderately alkaliphilic strains of a novel genus and species <I>Alkalibaculum bacchi</I> CP11<SUP>T</SUP>, CP13 and CP15 was investigated in 250ml bottle fermentations containing 100ml of yeast extract medium at 37°C and pH 8.0. Two commercial syngas mixtures (Syngas I: 20% CO, 15% CO<SUB>2</SUB>, 5% H<SUB>2</SUB>, 60% N<SUB>2</SUB>) and (Syngas II: 40% CO, 30% CO<SUB>2</SUB>, 30% H<SUB>2</SUB>) were used. Syngas I and Syngas II represent gasified biomass and coal, respectively. The maximum ethanol concentration (1.7gl<SUP>−1</SUP>) and yield from CO (76%) were obtained with strain CP15 and Syngas II after 360h. CP15 produced over twofold more ethanol with Syngas I compared to strains CP11<SUP>T</SUP> and CP13. In addition, CP15 produced 18% and 71% more ethanol using Syngas II compared to strains CP11<SUP>T</SUP> and CP13, respectively. These results show that CP15 is the most promising for ethanol production because of its higher growth and ethanol production rates and yield compared to CP11<SUP>T</SUP> and CP13.</P>