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Energies 2014, 7(3), 1363-1375; doi:10.3390/en7031363
Article

Comparative Analysis of Milled Wood Lignins (MWLs) Isolated from Sugar Maple (SM) and Hot-Water Extracted Sugar Maple (ESM)

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Received: 20 November 2013 / Revised: 1 February 2014 / Accepted: 18 February 2014 / Published: 5 March 2014
(This article belongs to the Special Issue Biomass and Biofuels 2013)
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Abstract

To further elucidate the advantageous effects of hot-water extraction (HWE) on delignification, milled wood lignin (MWL) was isolated from sugar maple (SM) and from hot-water extracted sugar maple (ESM). Ball-milled wood was analyzed for particle size distribution (PSD) before and after dioxane:water (DW) extraction. The MWL samples were analyzed by analytical and spectral methods. The results indicated that the MWL isolated from SM and ESM was mainly released from the middle lamella (ML) and the secondary wall (SW), respectively. The cleavage of dibenzodioxocin (DB) and spirodienone (SD) lignin substructures during HWE is suggested. The removal of lignin during acetone:water (AW) extraction of hot-water extracted wood indicates that including an additional operation in a hardwood HWE-based biorefinery would be beneficial for processing of wood.
Keywords: sugar maple (SM); hot-water extraction (HWE); milled wood lignin (MWL); heteronuclear single quantum coherence spectroscopy (HSQC) sugar maple (SM); hot-water extraction (HWE); milled wood lignin (MWL); heteronuclear single quantum coherence spectroscopy (HSQC)
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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Goundalkar, M.J.; Corbett, D.B.; Bujanovic, B.M. Comparative Analysis of Milled Wood Lignins (MWLs) Isolated from Sugar Maple (SM) and Hot-Water Extracted Sugar Maple (ESM). Energies 2014, 7, 1363-1375.

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