Structural Transformation of Isolated Poplar and Switchgrass Lignins from Dilute Acid Pretreatment
Abstract
A key step in conversion of cellulosic biomass into sustainable fuels and chemicals is thermochemical pretreatment to reduce plant cell wall recalcitrance. Obtaining an improved understanding of the fundamental chemistry of lignin, the most recalcitrant component of biomass, during pretreatment is critical to the continued development of renewable biofuel production. To examine the intrinsic chemistry of lignin during dilute acid pretreatment (DAP), lignin was isolated from poplar and switchgrass using a cellulolytic enzyme system and then treated under DAP conditions. These results highlight that lignin is subjected to depolymerization reactions within the first 2 min of dilute acid pretreatment and these changes are accompanied by increased generation of aliphatic and phenolic hydroxyl groups of lignin. This is followed by a competing set of depolymerization and repolymerization reactions that lead to a decrease in the content of guaiacyl lignin units and an increase in condensed lignin units as the reaction residence time is extended beyond 5 min. Finally, we showed that a detailed comparison of changes in functional groups and molecular weights of cellulolytic enzyme lignins with different structural parameters, related to the recalcitrant properties of lignin, could be successfully altered during DAP conditions.
- Authors:
-
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1237597
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Sustainable Chemistry & Engineering
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 9; Journal ID: ISSN 2168-0485
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 09 BIOMASS FUELS; poplar; switchgrass; dilute acid pretreatment; cellulolytic enzyme lignin; reaction mechanism
Citation Formats
Sun, Qining, Pu, Yunqiao, Meng, Xianzhi, Wells, Tyrone, and Ragauskas, Arthur J. Structural Transformation of Isolated Poplar and Switchgrass Lignins from Dilute Acid Pretreatment. United States: N. p., 2015.
Web. doi:10.1021/acssuschemeng.5b00426.
Sun, Qining, Pu, Yunqiao, Meng, Xianzhi, Wells, Tyrone, & Ragauskas, Arthur J. Structural Transformation of Isolated Poplar and Switchgrass Lignins from Dilute Acid Pretreatment. United States. https://doi.org/10.1021/acssuschemeng.5b00426
Sun, Qining, Pu, Yunqiao, Meng, Xianzhi, Wells, Tyrone, and Ragauskas, Arthur J. Thu .
"Structural Transformation of Isolated Poplar and Switchgrass Lignins from Dilute Acid Pretreatment". United States. https://doi.org/10.1021/acssuschemeng.5b00426. https://www.osti.gov/servlets/purl/1237597.
@article{osti_1237597,
title = {Structural Transformation of Isolated Poplar and Switchgrass Lignins from Dilute Acid Pretreatment},
author = {Sun, Qining and Pu, Yunqiao and Meng, Xianzhi and Wells, Tyrone and Ragauskas, Arthur J.},
abstractNote = {A key step in conversion of cellulosic biomass into sustainable fuels and chemicals is thermochemical pretreatment to reduce plant cell wall recalcitrance. Obtaining an improved understanding of the fundamental chemistry of lignin, the most recalcitrant component of biomass, during pretreatment is critical to the continued development of renewable biofuel production. To examine the intrinsic chemistry of lignin during dilute acid pretreatment (DAP), lignin was isolated from poplar and switchgrass using a cellulolytic enzyme system and then treated under DAP conditions. These results highlight that lignin is subjected to depolymerization reactions within the first 2 min of dilute acid pretreatment and these changes are accompanied by increased generation of aliphatic and phenolic hydroxyl groups of lignin. This is followed by a competing set of depolymerization and repolymerization reactions that lead to a decrease in the content of guaiacyl lignin units and an increase in condensed lignin units as the reaction residence time is extended beyond 5 min. Finally, we showed that a detailed comparison of changes in functional groups and molecular weights of cellulolytic enzyme lignins with different structural parameters, related to the recalcitrant properties of lignin, could be successfully altered during DAP conditions.},
doi = {10.1021/acssuschemeng.5b00426},
journal = {ACS Sustainable Chemistry & Engineering},
number = 9,
volume = 3,
place = {United States},
year = {Thu Aug 27 00:00:00 EDT 2015},
month = {Thu Aug 27 00:00:00 EDT 2015}
}
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