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Effect of extrusion conditions and hydrolysis with fiber-degrading enzymes on the production of C5 and C6 sugars from brewers’ spent grain for bioethanol production

E. Heredia‐Olea,E. Pérez‐Carrillo,S. Serna-Saldívar

Published 2015 in Unknown venue

ABSTRACT

The bioconversion of brewers’ spent grain into bioethanol was investigated in the present study using thermoplastic extrusion and the use of fiber degrading enzymes. The extrusion conditions i.e. tempering moisture, screws speed, and temperature of last zone of the barrel were taken into account in order to optimize the yield of C5 and C6 sugars during the subsequent enzymatic hydrolysis step of the fibers. The most important variable that affected the sugar yield was the extrusion temperature, followed by the screws speed. The best extrusion conditions were 20% tempering moisture, 200 rpm and 50 °C. No enzymatic and yeast inhibitors were detected in any of the enzymatically-treated fiber hydrolyzates. The fermentation resulted in 5.43 mL bioethanol per 100g of extruded brewers’ spent grain (dry weight basis). The only sugar consumed was glucose. The free amino nitrogen amount quantified in the hydrolyzates was as low as >20 mg L-1, negatively affecting sugars consumption during the fermentation and consequently the ethanol yield.

PUBLICATION RECORD

  • Publication year

    2015

  • Venue

    Unknown venue

  • Publication date

    2015-03-01

  • Fields of study

    Materials Science, Chemistry, Engineering, Environmental Science

  • Identifiers
    DOI 10.18331/BRJ2015.2.1.6
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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