Characterization of Eucalyptus nitens Lignins Obtained by Biorefinery Methods Based on Ionic Liquids
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Chemical Engineering Department, Polytechnical Building, University of Vigo (Campus Ourense), As Lagoas, 32004 Ourense, Spain
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Department of Pharmacy, University of Naples ‘Federico II’, Via Domenico Montesano, 49, 80131 Naples, Italy
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Department of Molecular Sciences and Nanosystems, University of Venice ‘Ca’Foscari’, Via Torino 155, 30170 Venice Mestre, Italy
*
Authors to whom correspondence should be addressed.
Molecules 2020, 25(2), 425; https://doi.org/10.3390/molecules25020425
Received: 23 December 2019
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Revised: 14 January 2020
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Accepted: 17 January 2020
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Published: 20 January 2020
(This article belongs to the Special Issue Lignin—Chemistry and Materials: Past, Present and Future)
Eucalyptus nitens wood samples were subjected to consecutive stages of hydrothermal processing for hemicellulose solubilization and delignification with an ionic liquid, i.e., either 1-butyl-3-methylimidazolium hydrogen sulfate or triethylammonium hydrogen sulfate. Delignification experiments were carried out a 170 °C for 10–50 min. The solid phases from treatments, i.e., cellulose-enriched solids, were recovered by centrifugation, and lignin was separated from the ionic liquid by water precipitation. The best delignification conditions were identified on the basis of the results determined for delignification percentage, lignin recovery yield, and cellulose recovery in solid phase. The lignins obtained under selected conditions were characterized in deep by 31P-NMR, 13C-NMR, HSQC, and gel permeation chromatography. The major structural features of the lignins were discussed in comparison with the results determined for a model Ionosolv lignin.
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Keywords:
Eucalyptus nitens; fractionation; ionic liquids; lignin; 31P-NMR; HSQC
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MDPI and ACS Style
Penín, L.; Lange, H.; Santos, V.; Crestini, C.; Parajó, J.C. Characterization of Eucalyptus nitens Lignins Obtained by Biorefinery Methods Based on Ionic Liquids. Molecules 2020, 25, 425. https://doi.org/10.3390/molecules25020425
AMA Style
Penín L, Lange H, Santos V, Crestini C, Parajó JC. Characterization of Eucalyptus nitens Lignins Obtained by Biorefinery Methods Based on Ionic Liquids. Molecules. 2020; 25(2):425. https://doi.org/10.3390/molecules25020425
Chicago/Turabian StylePenín, Lucía, Heiko Lange, Valentín Santos, Claudia Crestini, and Juan C. Parajó. 2020. "Characterization of Eucalyptus nitens Lignins Obtained by Biorefinery Methods Based on Ionic Liquids" Molecules 25, no. 2: 425. https://doi.org/10.3390/molecules25020425
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