Effect of pretreatment severity on the conversion of barley straw to fermentable substrates and the release of inhibitory compounds

I. Panagiotopoulos, R.R. Bakker, G.J. de Vrije, E.G. Koukios

Research output: Contribution to journalArticleAcademicpeer-review

61 Citations (Scopus)

Abstract

The production of fermentable substrates from barley straw under various process conditions was studied. Pretreatment included chemical pretreatment with dilute-acid followed by enzymatic hydrolysis; the pretreatment conditions were expressed in a combined severity factor, CS, which ranged in the present study from -1.6 to 1.1. Considering the production of fermentable sugars and the release of inhibitory compounds, the optimal pretreatment conditions were 170 °C, 0% sulfuric acid and 60 min, corresponding to CS -0.4. Under these conditions, 21.4 g glucose/L, 8.5 g xylose/L, and 0.5 g arabinose/L were produced, while 0.1 g HMF/L, 0.4 g furfural/L, 0.0 g levulinic acid/L, 0.0 g formic acid/L, and 2.1 g acetic acid/L were released. The ratio of Ssugars/Sinhibitors proved to be a good tool for evaluating the suitability of a hydrolysate for fermentation purposes.
Original languageEnglish
Pages (from-to)11204-11211
JournalBioresource Technology
Volume102
Issue number24
DOIs
Publication statusPublished - 2011

Keywords

  • dilute-acid pretreatment
  • ethanol-production
  • saccharomyces-cerevisiae
  • hydrogen-production
  • wheat-straw
  • caldicellulosiruptor-saccharolyticus
  • enzymatic saccharification
  • extreme thermophile
  • corn stover
  • acetic-acid

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