Characterization of water-soluble extracts from hot-pressed poplarBestimmung der wasserlöslichen Extrakte von heißgepresstem Pappelholz

被引：0
作者：
Noridah B. Osman
Armando G. McDonald
Marie-Pierre G. Laborie
机构：
[1] University of Idaho,Department of Forest, Rangeland, and Fire Sciences, Renewable Materials Program
[2] Albert-Ludwig University Freiburg,Institute of Forest Utilization and Work Sciences
来源：
European Journal of Wood and Wood Products | 2013年 / 71卷 / 3期
关键词：
Hemicellulose; Pectin; Moisture Content; Poplar; Aqueous Extract;
D O I：
10.1007/s00107-013-0686-3
中图分类号：
学科分类号：
摘要：
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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页码：343 / 351
页数：8
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