Fig. 5

Fed-batch fermentation for isobutanol and 2-methyl-1-butanol production from xylose. Xylose was fed every 24 h to keep the concentration at 103 ± 8 g/L (a) or 154 ± 11 g/L (b). Maximum compounded isobutanol yields (c) and productivities (d) achieved after 48 h of fermentation. All data represent the mean ± SD of biological triplicates