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Structural Variation of Bamboo Lignin before and after Ethanol Organosolv Pretreatment
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 18 September 2013; in revised form: 5 October 2013 / Accepted: 10 October 2013 / Published: 28 October 2013
Abstract: In order to make better use of lignocellulosic biomass for the production of renewable fuels and chemicals, it is necessary to disrupt its recalcitrant structure through pretreatment. Specifically, organosolv pretreatment is a feasible method. The main advantage of this method compared to other lignocellulosic pretreatment technologies is the extraction of high-quality lignin for the production of value-added products. In this study, bamboo was treated in a batch reactor with 70% ethanol at 180 °C for 2 h. Lignin fractions were isolated from the hydrolysate by centrifugation and then precipitated as ethanol organosolv lignin. Two types of milled wood lignins (MWLs) were isolated from the raw bamboo and the organosolv pretreated residue separately. After the pretreatment, a decrease of lignin (preferentially guaiacyl unit), hemicelluloses and less ordered cellulose was detected in the bamboo material. It was confirmed that the bamboo MWL is of HGS type (p-hydroxyphenyl (H), vanillin (G), syringaldehyde (S)) associated with a considerable amount of p-coumarate and ferulic esters of lignin. The ethanol organosolv treatment was shown to remove significant amounts of lignin and hemicelluloses without strongly affecting lignin primary structure and its lignin functional groups.
Keywords: organosolv pretreatment; MWL; lignin; Py-GC/MS; HSQC NMR
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Bai, Y.-Y.; Xiao, L.-P.; Shi, Z.-J.; Sun, R.-C. Structural Variation of Bamboo Lignin before and after Ethanol Organosolv Pretreatment. Int. J. Mol. Sci. 2013, 14, 21394-21413.
Bai Y-Y, Xiao L-P, Shi Z-J, Sun R-C. Structural Variation of Bamboo Lignin before and after Ethanol Organosolv Pretreatment. International Journal of Molecular Sciences. 2013; 14(11):21394-21413.
Bai, Yuan-Yuan; Xiao, Ling-Ping; Shi, Zheng-Jun; Sun, Run-Cang. 2013. "Structural Variation of Bamboo Lignin before and after Ethanol Organosolv Pretreatment." Int. J. Mol. Sci. 14, no. 11: 21394-21413.