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Microorganisms ferment xylose at high rate only when glucose concentration in the medium falls below a critical level. Since the specific productivity of product is highest during exponential to early stationary phase of growth, a glucose utilization negative ethanologenic E. coli (strain LW419a) was constructed for high rate of xylose fermentation in combination with Turbo yeast. This co-culture fermented all the released sugars in an acid/enzyme-treated sugar cane bagasse slurry (10% solids) to an ethanol titer of 24.9 ± 0.8 g.L (70% of the theoretical yield) in <30 h. Ethanol titer increased to 48.6 ± 1.04 g.L (yield, 0.45 g.g sugars) at a solids content of 20% and the highest rate of xylose consumption was 1.58 ± 0.21 g.L.h. This study demonstrates the potential of a co-culture of strain LW419a and yeast to rapidly ferment all the sugars in pretreated biomass slurries to ethanol at their respective highest rates.
This article was published in the following journal.
Name: Bioresource technology
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