Effects of residual lignin and heteropolysaccharides on the bioconversion of softwood lignocellulose nanofibrils obtained by SO2-ethanol-water fractionation

L.O. Morales, M Iakovlev, R. Martin-Sampedro, Jenni Rahikainen, J. Laine, A. van Heiningen, O.J. Rojas

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Abstract

The amount of residual lignin and hemicelluloses in softwood fibers was systematically varied by SO2-ethanol-water fractionation for integrated biorefinery with nanomaterial and biofuel production. On the basis of their low energy demand in mechanical processing, the fibers were deconstructed to lignocellulose nanofibrils (LCNF) and used as substrate for bioconversion. The effect of LCNF composition on saccharification via multicomponent enzymes was investigated at different loadings. LCNF digestibility was compared with the enzyme activity measured with a quartz crystal microbalance. LCNF hydrolysis rate gradually decreased with lignin and hemicellulose concentration, both of which limited enzyme accessibility. Enzyme inhibition resulted from non-productive binding of proteins onto lignin. Near complete LCNF hydrolysis was achieved, even at high lignin and hemicellulose content. Sugar yields for LCNF were higher than those for precursor SEW fibers, highlighting the benefits of high surface area in LCNF.
Original languageEnglish
Pages (from-to)55-62
JournalBioresource Technology
Volume161
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

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Keywords

  • lignocellulose nanofibrils (LCNF)
  • SO2-ethanol-water (SEW)
  • bioconversion
  • residual lignin
  • hemicelluloses

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