Lignin structural alterations in thermochemical pretreatments with limited delignification

Pu, Yunqiao; Hu, Fan; Huang, Fang; Ragauskas, Arthur J.

doi:10.1007/s12155-015-9655-5

Title: Lignin structural alterations in thermochemical pretreatments with limited delignification

Journal Article · Sun Aug 02 00:00:00 EDT 2015 · BioEnergy Research

DOI:https://doi.org/10.1007/s12155-015-9655-5· OSTI ID:1265704

Pu, Yunqiao ^[1]; Hu, Fan ^[2]; Huang, Fang ^[3]; Ragauskas, Arthur J. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Div.; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)
Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)
Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Div.; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemical and Biomolecular Engineering; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Forestry, Wildlife, and Fisheries, Center for Renewable Carbon; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)

Lignocellulosic biomass has a complex and rigid cell wall structure that makes biomass recalcitrant to biological and chemical degradation. Among the three major structural biopolymers (i.e., cellulose, hemicellulose and lignin) in plant cell walls, lignin is considered the most recalcitrant component and generally plays a negative role in the biochemical conversion of biomass to biofuels. The conversion of biomass to biofuels through a biochemical platform usually requires a pretreatment stage to reduce the recalcitrance. Pretreatment renders compositional and structural changes of biomass with these changes ultimately govern the efficiency of the subsequent enzymatic hydrolysis. Dilute acid, hot water, steam explosion, and ammonia fiber expansion pretreatments are among the leading thermochemical pretreatments with a limited delignification that can reduce biomass recalcitrance. Practical applications of these pretreatment are rapidly developing as illustrated by recent commercial scale cellulosic ethanol plants. While these thermochemical pretreatments generally lead to only a limited delignification and no significant change of lignin content in the pretreated biomass, the lignin transformations that occur during these pretreatments and the roles they play in recalcitrance reduction is an important research aspect. This review highlights recent advances in our understanding of lignin alterations during these limited delignification thermochemical pretreatments, with emphasis on lignin chemical structures, molecular weights, and redistributions in the pretreated biomass.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265704

Journal Information:: BioEnergy Research, Vol. 8, Issue 3; ISSN 1939-1234

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 54 works

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Impact of Steam Explosion on the Wheat Straw Lignin Structure Studied by Solution-State Nuclear Magnetic Resonance and Density Functional Methods Heikkinen, Harri; Elder, Thomas; Maaheimo, Hannu Journal of Agricultural and Food Chemistry, Vol. 62, Issue 43 https://doi.org/10.1021/jf504622j	journal	October 2014
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Pretreatment: the key to unlocking low-cost cellulosic ethanol Yang, Bin; Wyman, Charles E. Biofuels, Bioproducts and Biorefining, Vol. 2, Issue 1 https://doi.org/10.1002/bbb.49	journal	January 2008
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Chemical and Physicochemical Pretreatment of Lignocellulosic Biomass: A Review Brodeur, Gary; Yau, Elizabeth; Badal, Kimberly Enzyme Research, Vol. 2011 https://doi.org/10.4061/2011/787532	journal	January 2011

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