Ethanol Production from High-Solid SSCF of Alkaline-Pretreated Corncob Using Recombinant Zymomonas mobilis CP4
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In this work, Zymomonas mobilis was genetically improved for pentose utilization to increase the final ethanol concentration. It showed good fermentation ability on both soluble sugar mixture and lignocellulose. Nearly all the glucose and xylose in sugar mixture can be consumed, corresponding to 86 % of theoretic ethanol yield. Simultaneous saccharification and co-fermentation (SSCF) of NaOH-pretreated corncob was then carried out in a high dry matter (DM) loading of 15–25 w/v%. At the DM loading of 15 %, the suitable operating conditions were determined, i.e., Z. mobilis loading of 0.30 g dry weight/L at 30 °C (pH 5.5), under which the ethanol concentration reached 49.2 g/L. Higher final ethanol concentrations were obtained when SSCF was operated at the fed-batch mode. Several amounts of substrate (1 % to 10 %) were added, and the highest final ethanol concentration (60.5 g/L) was obtained at 10 % DM addition.
KeywordsSimultaneous saccharification and co-fermentation Recombinant Zymomonas mobilis Corncob Bioethanol Xylose fermentation Lignocellulose Cellulose High solids
The authors acknowledge the financial supports received from the National Natural Science Foundation of China (No. 21276192, 20976125, and 30900033), Open Funding Project of the State Key Laboratory of Bioreactor Engineering, and the Ministry of Education (Grant Nos. NCET-11-0372, 20110032130004 and B06006).
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