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Continuous SSCF of AFEX™ pretreated corn stover for enhanced ethanol productivity using commercial enzymes and Saccharomyces cerevisiae 424A (LNH-ST)†
Article first published online: 29 DEC 2012
Copyright © 2012 Wiley Periodicals, Inc.
Biotechnology and Bioengineering
Volume 110, Issue 5, pages 1302–1311, May 2013
How to Cite
Jin, M., Gunawan, C., Balan, V., Yu, X. and Dale, B. E. (2013), Continuous SSCF of AFEX™ pretreated corn stover for enhanced ethanol productivity using commercial enzymes and Saccharomyces cerevisiae 424A (LNH-ST). Biotechnol. Bioeng., 110: 1302–1311. doi: 10.1002/bit.24797
- Issue published online: 20 MAR 2013
- Article first published online: 29 DEC 2012
- Accepted manuscript online: 28 NOV 2012 08:24AM EST
- Manuscript Accepted: 19 NOV 2012
- Manuscript Revised: 23 OCT 2012
- Manuscript Received: 26 JUL 2012
- U.S. Department of Energy. Grant Number: DE—FC02—07ER64494
- continuous fermentation;
- cellulosic ethanol;
- enzymatic hydrolysis
High productivity processes are critical for commercial production of cellulosic ethanol. One high productivity process—continuous hydrolysis and fermentation—has been applied in corn ethanol industry. However, little research related to this process has been conducted on cellulosic ethanol production. Here, we report and compare the kinetics of both batch SHF (separate hydrolysis and co-fermentation) and SSCF (simultaneous saccharification and co-fermentation) of AFEX™ (Ammonia Fiber Expansion) pretreated corn stover (AFEX™-CS). Subsequently, we designed a SSCF process to evaluate continuous hydrolysis and fermentation performance on AFEX™-CS in a series of continuous stirred tank reactors (CSTRs). Based on similar sugar to ethanol conversions (around 80% glucose-to-ethanol conversion and 47% xylose-to-ethanol conversion), the overall process ethanol productivity for continuous SSCF was 2.3- and 1.8-fold higher than batch SHF and SSCF, respectively. Slow xylose fermentation and high concentrations of xylose oligomers were the major factors limiting further enhancement of productivity. Biotechnol. Bioeng. 2013; 110: 1302–1311. © 2012 Wiley Periodicals, Inc.