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Effects of residual lignin and heteropolysaccharides on the bioconversion of softwood lignocellulose nanofibrils after SO2-ethanol-water fractionation
Department of Forest Products Technology, School of Chemical Technology, Aalto University, Aalto, Finland. (Molecular Biochemistry)ORCID iD: 0000-0002-9233-7254
Department of Forest Products Technology, School of Chemical Technology, Aalto University, Aalto, Finland.
Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria INIA, Madrid, Spain.
VTT Technical Research Centre of Finland, Finland.
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2014 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 161, p. 55-62Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 161, p. 55-62
Keywords [en]
Lignocellulose nanofibrils (LCNF), SO2-ethanol-water (SEW), Bioconversion, Residual lignin, Hemicelluloses
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:oru:diva-72403DOI: 10.1016/j.biortech.2014.03.025ISI: 000335436000007PubMedID: 24686371Scopus ID: 2-s2.0-84896926498OAI: oai:DiVA.org:oru-72403DiVA, id: diva2:1288047
Funder
Academy of Finland
Note

Funding agency: TEKES

Available from: 2019-02-12 Created: 2019-02-12 Last updated: 2019-02-21Bibliographically approved

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Morales, Luis Orlando

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