Abstract
Objectives
To develop a xylose-nonutilizing Escherichia coli strain for ethanol production and xylose recovery.
Results
Xylose-nonutilizing E. coli CICIM B0013-2012 was successfully constructed from E. coli B0013-1030 (pta-ack, ldhA, pflB, xylH) by deletion of frdA, xylA and xylE. It exhibited robust growth on plates containing glucose, arabinose or galactose, but failed to grow on xylose. The ethanol synthesis pathway was then introduced into B0013-2012 to create an ethanologenic strain B0013-2012PA. In shaking flask fermentation, B0013-2012PA fermented glucose to ethanol with the yield of 48.4 g/100 g sugar while xylose remained in the broth. In a 7-l bioreactor, B0013-2012PA fermented glucose, galactose and arabinose in the simulated corncob hydrolysate to 53.4 g/l ethanol with the yield of 48.9 g/100 g sugars and left 69.6 g/l xylose in the broth, representing 98.6% of the total xylose in the simulated corncob hydrolysate.
Conclusions
By using newly constructed strain B0013-2012PA, we successfully developed an efficient bioprocess for ethanol production and xylose recovery from the simulated corncob hydrolysate.
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Acknowledgements
This research was supported financially by The Raising Program of Innovation Team for Tianjin Universities (TD12-5002).
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Supplementary Table 1—Primers used in this study.
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Sun, J., Wang, J., Tian, K. et al. A novel strategy for production of ethanol and recovery of xylose from simulated corncob hydrolysate. Biotechnol Lett 40, 781–788 (2018). https://doi.org/10.1007/s10529-018-2537-0
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DOI: https://doi.org/10.1007/s10529-018-2537-0