The minimum and maximum ethanol
produced in these studies were 13.0 ± 2.0 and 41.8 ± 0.0 g/L from
pretreated WS (86–150 g/L) which are equivalent to 0.17 and
0.28 g ethanol per g straw, respectively. The yields varied between
0.37 and 0.50 g per g of available sugars depending on the type of
pretreatment used. The fermentation time also varied greatly from
17 to 136 h which was also highly dependent on the type of pretreatment and the inhibitory compounds present in the pretreated
hydrolyzate. We also studied the long term performance of this
recombinant bacterium in a series of continuous culture runs
(16–105 days) using alkaline peroxide pretreated and enzymatically saccharified wheat straw hydrolyzate (WSH) as feedstock
(Saha and Cotta, 2011).