Journal
BIORESOURCE TECHNOLOGY
Volume 154, Issue -, Pages 274-281Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.12.072
Keywords
Lignin structure; Soluble lignin; Nuclear magnetic resonance (NMR); Cellulose hydrolysis
Funding
- Biomass Research & Development Initiative Competitive Grant from the USDA National Institute of Food and Agriculture [2001-10006-3058]
- US-India Consortium Grant from DOE
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The structure of lignin after dilute phosphoric acid plus steam explosion pretreatment process of sugarcane bagasse in a pilot scale and the effect of the lignin extracted by ethanol on subsequent cellulose hydrolysis were investigated. The lignin structural changes caused by pretreatment were identified using advanced nondestructive techniques such as gel permeation chromatography (GPC), quantitative C-13, and 2-D nuclear magnetic resonance (NMR). The structural analysis revealed that ethanol extractable lignin preserved basic lignin structure, but had relatively lower amount of beta-O-4 linkages, syringyl/guaiacyl units ratio (S/G), p-coumarate/ferulate ratio, and other ending structures. The results also indicated that approximately 8% of mass weight was extracted by pure ethanol. The bagasse after ethanol extraction had an approximate 22% higher glucose yield after enzyme hydrolysis compared to pretreated bagasse without extraction. (C) 2013 Elsevier Ltd. All rights reserved.
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