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Characterization of milled wood lignin and ethanol organosolv lignin from miscanthus |
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| Authors: | Roland El Hage Laurent Chrusciel Poulomi Sannigrahi |
| Affiliation: | a Laboratoire d'Etude et de Recherche sur le Materiau Bois, Faculté des Sciences et Techniques, Nancy-Université, Bld des Aiguillettes, F-54500 Vandoeuvre-lès-Nancy, France b School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA c Laboratoire d'Ingénierie des Biomolécules, ENSAIA, Nancy-Université, 2 avenue de la Forêt de Haye, BP 172 54505 Vandoeuvre les Nancy Cedex, France |
| Abstract: | Ethanol organosolv lignin extracted from Miscanthus × giganteus (using the following conditions: T = 190 °C, t = 60 min, sulfuric acid = 1.2% w/w, EtOH/H2O = 0.65) and milled wood lignin from Miscanthus × giganteus were subjected to a comprehensive structural characterization by 13C, 31P NMR, FTIR, UV spectroscopies and size exclusion chromatography. The results showed that Miscanthus lignin is an H/G/S type (4%, 52%, 44% respectively) with ∼0.41 β-O-4 linkage per aromatic ring and contains coumarylate linkages (0.1/Ar). It was shown that during organosolv treatment, cleavage of β-O-4 linkages and of ester bond (acetyl and coumaryl residues) was the major mechanisms of lignin breakdown but the process did not significantly change the core of the lignin structure. |
| Keywords: | Miscanthus × giganteus Lignin Organosolv pre-treatment 13C NMR 31P NMR UV spectroscopy |
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