Understanding the impact of ionic liquid pretreatment on eucalyptus

Persil Çetinkol, Özgül
Cheng, Gang
Kent, Mıchael
Knıerım, Bernard
Auer, Manfred
Wemmer, Davıd
Pelton, Jeffery
Sımmons, Blake
Melnıchenko, Yurı
Holmes, Bradley
Ralph, John
Background: The development of cost-competitive biofuels necessitates the realization of advanced biomass pretreatment technologies. Ionic liquids provide a basis for one of the most promising pretreatment technologies and are known to allow effective processing of cellulose and some biomass species. Results & discussion: Here, we demonstrate that the ionic liquid 1-ethyl-3-methyl imidazolium acetate, [C2mim][OAc], induces structural changes at the molecular level in the cell wall of Eucalyptus globulus. Deacetylation of xylan, acetylation of the lignin units, selective removal of guaiacyl units (increasing the syringyl:guaiacyl ratio) and decreased β-ether content were the most prominent changes observed. Scanning electron microscopy images of the plant cell wall sections reveal extensive swelling during [C2mim][OAc] pretreatment. X-ray diffraction measurements indicate a change in cellulose crystal structure from cellulose I to cellulose II after [C2mim][OAc] pretreatment. Enzymatic saccharification of the pretreated material produced increased sugar yields and improved hydrolysis kinetics after [C2mim][OAc] pretreatment. Conclusion: These results provide new insight into the mechanism of ionic liquid pretreatment and reaffirm that this approach may be promising for the production of cellulosic biofuels from woody biomass


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Citation Formats
Ö. Persil Çetinkol et al., “Understanding the impact of ionic liquid pretreatment on eucalyptus,” Biofuels, pp. 33–46, 2010, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/83521.