Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 61, Issue 33, Pages 7874-7882Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf401980p
Keywords
green solvents; fractionation; cellulose; hemicellulose; lignin; capillary electrophoresis
Funding
- Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) [SFRH/BPD/26356/2006, PEst-C/EQB/LA0006/2011]
- Programme Ciencia
- LNEG through ERA-IB project [Lignocelluloses-EIB.10.013]
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Pretreatment of lignocellulosic biomass with ionic liquids (as) is a promising and challenging process for an alternative method of biomass processing. The present work emphasizes the examination of wheat straw pretreatment using ILs, namely, 1-butyl-3-methylimidazolium hydrogensulfate ([bmim][HSO4]), 1-butyl-3-methylimidazolium thiocyanate abmim][SCN]), and 1-butyl-3-methylimidazolium dicyanamide ([bmim][N(CN)(2)]). Only [bmim][HSO4] was found to achieve a macroscopic complete dissolution of wheat straw during pretreatment. The fractionation process demonstrated to be dependent on the IL used. Using [bmim][SCNI], a high-purity lignin-rich material was obtained. In contrast, [bmim][N(CN)(2)] was a good solvent to produce high-purity carbohydrate-rich fractions. When [bmim][HSO4] was used, a different behavior was observed, exhibiting similarities to an acid hydrolysis pretreatment, and no hemicellulose-rich material was recovered during fractionation. A capillary electrophoresis (CE) technique allowed for a better understanding of this phenomenon. Hydrolysis of carbohydrates was confirmed, although an extended degradation of monosaccharides to furfural and hydroxymethylfurfural (HMF) was observed.
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