Continuous SSCF of AFEX™ pretreated corn stover for enhanced ethanol productivity using commercial enzymes and Saccharomyces cerevisiae 424A (LNH-ST)

Mingjie Jin, Christa Gunawan, Venkatesh Balan, Xiurong Yu, Bruce E. Dale

Research output: Contribution to journalArticle

  • 25 Citations

Abstract

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.

LanguageEnglish (US)
Pages1302-1311
Number of pages10
JournalBiotechnology and Bioengineering
Volume110
Issue number5
DOIs
StatePublished - May 2013

Profile

Saccharification
Yeast
Fermentation
Zea mays
Saccharomyces cerevisiae
Ethanol
Enzymes
Productivity
Xylose
Hydrolysis
Cellulosic ethanol
Ammonia
Oligomers
Sugars
Glucose
Industry
Kinetics
Fibers

Keywords

  • AFEX
  • Cellulosic ethanol
  • Continuous fermentation
  • Enzymatic hydrolysis
  • SHF
  • SSCF

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology

Cite this

Continuous SSCF of AFEX™ pretreated corn stover for enhanced ethanol productivity using commercial enzymes and Saccharomyces cerevisiae 424A (LNH-ST). / Jin, Mingjie; Gunawan, Christa; Balan, Venkatesh; Yu, Xiurong; Dale, Bruce E.

In: Biotechnology and Bioengineering, Vol. 110, No. 5, 05.2013, p. 1302-1311.

Research output: Contribution to journalArticle

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