Characterization of water-soluble extracts from hot-pressed poplar |
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Authors: | Noridah B. Osman Armando G. McDonald Marie-Pierre G. Laborie |
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Affiliation: | 1. Department of Forest, Rangeland, and Fire Sciences, Renewable Materials Program, University of Idaho, PO Box 441132, Moscow, ID, 83844, USA 2. Institute of Forest Utilization and Work Sciences, Albert-Ludwig University Freiburg, Freiburg im Breisgau, Germany
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Abstract: | Thermal modification of wood constituents occurs upon hot-pressing of flakes during consolidation of oriented strand board (OSB). Hence, the effects of hot-pressing of hybrid poplar on water-soluble extractives were studied. Poplar veneers were pre-conditioned to 0 or 8 % moisture content and subsequently hot-pressed at 150, 200 or 250 °C. Aqueous extracts were characterized by conventional chemical methods in conjunction with chromatography (HPLC and SEC), mass spectrometry (ESI–MS) and spectroscopy (FTIR) analysis. Water-soluble fractions were markedly influenced by thermal compression treatment at 250 °C compared to the lower temperatures. Chromatographic results indicate that water-soluble extractives content increases with temperature while the degree of polymerization decreases with detection at low temperature levels. FTIR spectroscopic analysis indicates changes in aqueous-extracts composition of wood monosaccharides (hemicelluloses), meanwhile ESI–MS detected xylo-oligosaccharides. These results clearly show that heat treatment dictated the changes in each water-soluble extractive component and they respond independently with different treatment. |
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