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Int. J. Mol. Sci. 2013, 14(11), 21394-21413; doi:10.3390/ijms141121394
Article

Structural Variation of Bamboo Lignin before and after Ethanol Organosolv Pretreatment

1,†, 1,†, 1 and 1,2,*
Received: 18 September 2013; in revised form: 5 October 2013 / Accepted: 10 October 2013 / Published: 28 October 2013
(This article belongs to the Section Material Sciences and Nanotechnology)
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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 organosolv pretreatment; MWL; lignin; Py-GC/MS; HSQC NMR
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

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.

Chicago/Turabian Style

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.



Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert