Significance of Lignin S/G Ratio in Biomass Recalcitrance of Populus trichocarpa Variants for Bioethanol Production

Robert Sykes, Chang Yoo, Alexandru Dumitrache, Wellington Muchero, Jace Natzke, Hannah Akinosho, Mi Li, Steven Brown, Brian Davison, Gerald Tuskan, Yunqiao Pu, Arthur Ragauskas

Research output: Contribution to journalArticlepeer-review

106 Scopus Citations

Abstract

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.
Original languageAmerican English
Pages (from-to)2162-2168
Number of pages7
JournalACS Sustainable Chemistry and Engineering
Volume6
Issue number2
DOIs
StatePublished - 2018

NREL Publication Number

  • NREL/JA-5100-71261

Keywords

  • bioethanol
  • lignin S/G ratio
  • NMR
  • Populus
  • Py-MBMS

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