Consolidated bioprocessing of Populus using Clostridium (Ruminiclostridium) thermocellum: a case study on the impact of lignin composition and structure
Abstract
Higher ratios of syringyl-to-guaiacyl (S/G) lignin components of Populus were shown to improve sugar release by enzymatic hydrolysis using commercial blends. Cellulolytic microbes are often robust biomass hydrolyzers and may offer cost advantages, however, it is unknown whether their activity can also be significantly influenced by the ratio of different monolignol types in Populus biomass. Hydrolysis and fermentation of autoclaved but otherwise not pretreated Populus trichocarpa by Clostridium thermocellum ATCC 27405 was compared using feedstocks that had similar carbohydrate and total lignin contents but differed in S/G ratios. Populus with an S/G ratio of 2.1 was converted more rapidly and to a greater extent compared to similar biomass that had a ratio of 1.2. For either microbes or commercial enzymes, an approximate 50% relative difference in total solids solubilization was measured for both biomasses, which suggests that the differences and limitations in the microbial breakdown of lignocellulose may be largely from the enzymatic hydrolytic process. Unexpectedly, the reduction in glucan content per gram solid in the residual microbially processed biomass was similar (17 18 %) irrespective of S/G ratio, pointing to a similar mechanism of solubilization that proceeded at different rates. Fermentation metabolome testing did not reveal the release ofmore »
- Authors:
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Office of Biological and Environmental Research; USDOE Office of Science (SC)
- OSTI Identifier:
- 1618635
- Alternate Identifier(s):
- OSTI ID: 1240075; OSTI ID: 1240560
- Report Number(s):
- NREL/JA-5100-65961
Journal ID: ISSN 1754-6834; 31; PII: 445
- Grant/Contract Number:
- Bioenergy Science Center (BESC) which is a U.S. Department of Energy Bioenergy Research Center supported by the Office of Biological and Environmental Research in the DOE Office of Science.; AC36-08GO28308; AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Biotechnology for Biofuels
- Additional Journal Information:
- Journal Name: Biotechnology for Biofuels Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 1754-6834
- Publisher:
- Springer Science + Business Media
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANAYLYTICAL CHEMISTRY; lignin; syringyl; guaiacyl; S/G ratio; consolidated bioprocessing; Populus; Clostridium thermocellum; molecular weight; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Dumitrache, Alexandru, Akinosho, Hannah, Rodriguez, Jr., Miguel, Meng, Xianzhi, Yoo, Chang Geun, Natzke, Jace, Engle, Nancy L., Sykes, Robert W., Tschaplinski, Timothy J., Muchero, Wellington, Ragauskas, Arthur J., Davison, Brian H., and Brown, Steven D. Consolidated bioprocessing of Populus using Clostridium (Ruminiclostridium) thermocellum: a case study on the impact of lignin composition and structure. Netherlands: N. p., 2016.
Web. doi:10.1186/s13068-016-0445-x.
Dumitrache, Alexandru, Akinosho, Hannah, Rodriguez, Jr., Miguel, Meng, Xianzhi, Yoo, Chang Geun, Natzke, Jace, Engle, Nancy L., Sykes, Robert W., Tschaplinski, Timothy J., Muchero, Wellington, Ragauskas, Arthur J., Davison, Brian H., & Brown, Steven D. Consolidated bioprocessing of Populus using Clostridium (Ruminiclostridium) thermocellum: a case study on the impact of lignin composition and structure. Netherlands. https://doi.org/10.1186/s13068-016-0445-x
Dumitrache, Alexandru, Akinosho, Hannah, Rodriguez, Jr., Miguel, Meng, Xianzhi, Yoo, Chang Geun, Natzke, Jace, Engle, Nancy L., Sykes, Robert W., Tschaplinski, Timothy J., Muchero, Wellington, Ragauskas, Arthur J., Davison, Brian H., and Brown, Steven D. Thu .
"Consolidated bioprocessing of Populus using Clostridium (Ruminiclostridium) thermocellum: a case study on the impact of lignin composition and structure". Netherlands. https://doi.org/10.1186/s13068-016-0445-x.
@article{osti_1618635,
title = {Consolidated bioprocessing of Populus using Clostridium (Ruminiclostridium) thermocellum: a case study on the impact of lignin composition and structure},
author = {Dumitrache, Alexandru and Akinosho, Hannah and Rodriguez, Jr., Miguel and Meng, Xianzhi and Yoo, Chang Geun and Natzke, Jace and Engle, Nancy L. and Sykes, Robert W. and Tschaplinski, Timothy J. and Muchero, Wellington and Ragauskas, Arthur J. and Davison, Brian H. and Brown, Steven D.},
abstractNote = {Higher ratios of syringyl-to-guaiacyl (S/G) lignin components of Populus were shown to improve sugar release by enzymatic hydrolysis using commercial blends. Cellulolytic microbes are often robust biomass hydrolyzers and may offer cost advantages, however, it is unknown whether their activity can also be significantly influenced by the ratio of different monolignol types in Populus biomass. Hydrolysis and fermentation of autoclaved but otherwise not pretreated Populus trichocarpa by Clostridium thermocellum ATCC 27405 was compared using feedstocks that had similar carbohydrate and total lignin contents but differed in S/G ratios. Populus with an S/G ratio of 2.1 was converted more rapidly and to a greater extent compared to similar biomass that had a ratio of 1.2. For either microbes or commercial enzymes, an approximate 50% relative difference in total solids solubilization was measured for both biomasses, which suggests that the differences and limitations in the microbial breakdown of lignocellulose may be largely from the enzymatic hydrolytic process. Unexpectedly, the reduction in glucan content per gram solid in the residual microbially processed biomass was similar (17 18 %) irrespective of S/G ratio, pointing to a similar mechanism of solubilization that proceeded at different rates. Fermentation metabolome testing did not reveal the release of known biomass-derived alcohol and aldehyde inhibitors that could explain observed differences in microbial hydrolytic activity. Biomass-derived p-hydroxybenzoic acid was up to nine-fold higher in low S/G ratio biomass fermentations, but was not found to be inhibitory in subsequent test fermentations. Cellulose crystallinity and degree of polymerization did not vary between Populus lines and had minor changes after fermentation. However, lignin molecular weights and cellulose accessibility determined by Simons staining were positively correlated to the S/G content. Higher S/G ratios in Populus biomass lead to longer and more linear lignin chains and greater access to surface cellulosic content by microbe-bound enzymatic complexes. Substrate access limitation is suggested as a primary bottleneck in solubilization of minimally processed Populus, which has important implications for microbial deconstruction of lignocellulose biomass. Lastly, our findings will allow others to examine different Populus lines and to test if similar observations are possible for other plant species.},
doi = {10.1186/s13068-016-0445-x},
journal = {Biotechnology for Biofuels},
number = 1,
volume = 9,
place = {Netherlands},
year = {Thu Feb 04 00:00:00 EST 2016},
month = {Thu Feb 04 00:00:00 EST 2016}
}
https://doi.org/10.1186/s13068-016-0445-x
Web of Science
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