Deep Eutectic Solvent Aqueous Solutions as Efficient Media for the Solubilization of Hardwood Xylans
authors Morais, ES; Mendonca, PV; Coelho, JFJ; Freire, MG; Freire, CSR; Coutinho, JP; Silvestre, AJD
nationality International
journal CHEMSUSCHEM
author keywords biorefinery; deep eutectic solvents; extraction; green solvents; xylans
keywords LIGNOCELLULOSIC BIOMASS; IONIC LIQUIDS; KRAFT PULP; EXTRACTION; WOOD; OIL; HEMICELLULOSES; VALORIZATION; CHEMICALS; CHLORIDE
abstract This work contributes to the development of integrated lignocellulosic-based biorefineries by the pioneering exploitation of hardwood xylans by solubilization and extraction in deep eutectic solvents (DES). DES formed by choline chloride and urea or acetic acid were initially evaluated as solvents for commercial xylan as a model compound. The effects of temperature, molar ratio, and concentration of the DES aqueous solutions were evaluated and optimized by using a response surface methodology. The results obtained demonstrated the potential of these solvents, with 328.23g L-1 of xylan solubilization using 66.7 wt% DES in water at 80 degrees C. Furthermore, xylans could be recovered by precipitation from the DES aqueous media in yields above 90%. The detailed characterization of the xylans recovered after solubilization in aqueous DES demonstrated that 4-O-methyl groups were eliminated from the 4-O-methylglucuronic acids moieties and uronic acids (15%) were cleaved from the xylan backbone during this process. The similar M-w values of both pristine and recovered xylans confirmed the success of the reported procedure. DES recovery in four additional extraction cycles was also demonstrated. Finally, the successful extraction of xylans from Eucalyptus globulus wood by using aqueous solutions of DES was demonstrated.
publisher WILEY-V C H VERLAG GMBH
issn 1864-5631
year published 2018
volume 11
issue 4
beginning page 753
ending page 762
digital object identifier (doi) 10.1002/cssc.201702007
web of science category Chemistry, Multidisciplinary; GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
subject category Chemistry; Science & Technology - Other Topics
unique article identifier WOS:000425730600013
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journal impact factor 7.411
5 year journal impact factor 7.575
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