Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 2, Pages 2162-2168Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b03586
Keywords
lignin S/G ratio; Populus; bioethanol; NMR; Py-MBMS
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Funding
- U.S. Department of Energy (DOE) [DE-AC05-00OR22725]
- Office of Biological and Environmental Research in the DOE Office of Science
- BioEnergy Science Center (BESC)
- Center for Bioenergy Innovation (CBI)
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Lignin S/G ratio has been investigated as an important factor in biomass recalcitrance to bioethanol production. Because of the complexity and variety of biomass, recalcitrance was also reportedly influenced by several other factors, such as total lignin content, degree of cellulose polymerization, etc. In addition, the effect of S/G ratio on biomass conversion is not uniform across plant species. Herein, 11 Populus trichocarpa natural variants grown under the same conditions with similar total lignin content were selected to minimize the effects of other factors. The lignin S/G ratio of the selected P. trichocarpa natural variants showed negative correlations with p-hydroxybenzoate (PB) and beta-5 linkage contents, while it had positive ones with beta-O-4 linkage, lignin molecular weight, and ethanol production. This study showed the importance of lignin S/G ratio as an independent recalcitrance factor that may aid future energy crop engineering and biomass conversion strategies.
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