Structural changes of sugarcane bagasse lignin during cellulosic ethanol production process

Tana, Tana, Zhang, Zhanying, Moghaddam, Lalehvash, Rackemann, Darryn W., Rencoret, Jorge, Gutierrez, Ana, del Rio, Jose, & Doherty, William O.S. (2016) Structural changes of sugarcane bagasse lignin during cellulosic ethanol production process. ACS Sustainable Chemistry & Engineering. (In Press)

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Abstract

Dilute acid pretreatment is one of the most studied biomass deconstructing technologies due to its relatively low process cost. Typical cellulosic ethanol production process involves three main stages: (1) dilute acid pretreatment, (2) enzymatic hydrolysis, and (3) fermentation/distillation. In this study, three lignins, L1, L2 and L3, were extracted using 1% (w/w) NaOH solution at 80 °C following each stage, respectively. Lignin characterisation shows the reduction of aliphatic, guaiacyl and carboxylic OH groups of the L2 and L3 compared to those of the L1, but increases in both the weight and number molecular weights as well as slight increases in the polydispersity index, probably because, among other reasons, of removal of a higher molecular weight lignin fraction from the pretreated biomass during enzymatic hydrolysis. While 2D HSQC NMR and Py-GC/MS did not reveal differences in the proportions of syringyl and p-hydroxyphenyl units among the lignins, there is the predominance of the phenylcoumaran substructures and guaiacyl lignin units in L1 and the absence of some substructures/linkages associated with L2 and L3. Lignin extraction following dilute acid pretreatment not only produced the lignin with the highest purity, but also resulted in improved glucose yield from 71% to 77%.

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ID Code: 98722
Item Type: Journal Article
Refereed: Yes
DOI: 10.1021/acssuschemeng.6b01093
ISSN: 2168-0485
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Research Centres > Centre for Tropical Crops and Biocommodities
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 American Chemical Society
Deposited On: 12 Sep 2016 22:20
Last Modified: 20 Sep 2016 19:10

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