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Origin of the acetylated structures present in white birch (Betula pendula Roth) milled wood lignin |
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| Authors: | Jorge Rencoret José C del Río Ana Gutiérrez ángel T Martínez Shiming Li Jim Park?s Knut Lundquist |
| Institution: | 1. Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, P.O. Box 1052, 41080, Seville, Spain 2. Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain 3. Physical Chemistry, Department of Chemical and Biological Engineering, Chalmers University of Technology, 412 96, G?teborg, Sweden 4. S?dra Cell AB, R&D, 430 20, V?r?backa, Sweden 5. Forest Products and Chemical Engineering, Department of Chemical and Biological Engineering, Chalmers University of Technology, 412 96, G?teborg, Sweden |
| Abstract: | The occurrence and nature of acetate groups in the milled wood lignin (MWL) isolated from birch (Betula pendula Roth) has been addressed by spectroscopic (2D-NMR) and chemical degradative (derivatization followed by reductive cleavage, DFRC) methods. Considerable amounts of acetate groups were present in the MWL preparation. However, 2D-NMR analysis indicated that the lignin polymer is not extensively acetylated and that the major part of the acetate groups is attached to the xylan moieties present in the MWL preparation. Nevertheless, evidence of the presence of minor acetylation of the γ-carbon of the lignin side chain (<3% of both syringyl and guaiacyl lignin units) was provided by DFRC analysis. |
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