Structural changes of corn stover lignin during acid pretreatment View Full Text


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Article Info

DATE

2012-09

AUTHORS

Geoffrey Moxley, Armindo Ribeiro Gaspar, Don Higgins, Hui Xu

ABSTRACT

In this study, raw corn stover was subjected to dilute acid pretreatments over a range of severities under conditions similar to those identified by the National Renewable Energy Laboratory (NREL) in their techno-economic analysis of biochemical conversion of corn stover to ethanol. The pretreated corn stover then underwent enzymatic hydrolysis with yields above 70 % at moderate enzyme loading conditions. The enzyme exhausted lignin residues were characterized by ³¹P NMR spectroscopy and functional moieties quantified and correlated to enzymatic hydrolysis yields. Results from this study indicated that both xylan solubilization and lignin degradation are important for improving the enzyme accessibility and digestibility of dilute acid pretreated corn stover. At lower pretreatment temperatures, there is a good correlation between xylan solubilization and cellulose accessibility. At higher pretreatment temperatures, lignin degradation correlated better with cellulose accessibility, represented by the increase in phenolic groups. During acid pretreatment, the ratio of syringyl/guaiacyl functional groups also gradually changed from less than 1 to greater than 1 with the increase in pretreatment temperature. This implies that more syringyl units are released from lignin depolymerization of aryl ether linkages than guaiacyl units. The condensed phenolic units are also correlated with the increase in pretreatment temperature up to 180 °C, beyond which point condensation reactions may overtake the hydrolysis of aryl ether linkages as the dominant reactions of lignin, thus leading to decreased cellulose accessibility. More... »

PAGES

1289-1299

References to SciGraph publications

  • 2010-09. Structural Characterization and Comparison of Switchgrass Ball-milled Lignin Before and After Dilute Acid Pretreatment in APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
  • 2005-03. Weak lignin-binding enzymes in APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
  • 2003-03. Dilute-sulfuric acid pretreatment of corn stover in pilot-scale reactor in APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
  • 2011-06. Quantification of lignin–carbohydrate linkages with high-resolution NMR spectroscopy in PLANTA
  • 2009-08. Can delignification decrease cellulose digestibility in acid pretreated corn stover? in CELLULOSE
  • 2005-03. Strategies to enhance the enzymatic hydrolysis of pretreated softwood with high residual lignin content in APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
  • 2010-12. Lignin monomer composition affects Arabidopsis cell-wall degradability after liquid hot water pretreatment in BIOTECHNOLOGY FOR BIOFUELS
  • 1980-06. A structural model of softwood lignin in WOOD SCIENCE AND TECHNOLOGY
  • 2010-12. Evaluation of ammonia fibre expansion (AFEX) pretreatment for enzymatic hydrolysis of switchgrass harvested in different seasons and locations in BIOTECHNOLOGY FOR BIOFUELS
  • 1992-06. Quantitative studies on furfural and organic acid formation during hydrothermal, acidic and alkaline degradation ofD-xylose in MONATSHEFTE FÜR CHEMIE - CHEMICAL MONTHLY
  • 2011-09. On Polydispersity of Plant Biomass Recalcitrance and Its Effects on Pretreatment Optimization for Sugar Production in BIOENERGY RESEARCH
  • 2008-12. Effects of Two-Stage Dilute Acid Pretreatment on the Structure and Composition of Lignin and Cellulose in Loblolly Pine in BIOENERGY RESEARCH
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10295-012-1131-z

    DOI

    http://dx.doi.org/10.1007/s10295-012-1131-z

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1018786535

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/22543524


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