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《Forest Research》 2001-04
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Study on FTIR,~1H and ~(13)C NMR Characterization of Poplar I 214 Heartwood and Sapwood Lignins

QIN Te fu (Research Institute of Wood Industry, CAF, Beijing 100091, China)  
Milled wood lignins (MWLs)extracted from poplar I 214Populus×euramericana(Dode) Guineir cv.'I 214'] heartwood and sapwood were characterized by elemental analysis,FTIR, 1H and 13 C NMR spectroscopy.The results showed that the methoxyl content in heartwood lignin was 8.73% higher than that in sapwood lignin,and the C 9 empirical formula for heartwood lignin and sapwood lignin were C 9H 7 16 O 2 38 (OCH 3) 1 99 and C 9H 8 61 O 2 73 (OCH 3) 1 33 ,based on methoxyl and elemental analysis.The free aliphatic hydroxyl groups per C 9 unit (OH aliph ) were 78.2% in total numbers of hydroxyl groups of heartwood lignin,and the free phenolic hydroxyl groups(OH ph )were 21 8%.The OH aliph were 79 2% and the OH ph were 20 8% in sapwood lignin.The hearwood lignin showed 55 5% guaiacyl units and 44 5% syringyl units in the aromatic region.The sapwood lignin showed 61 3% guaiacyl units and 38 7% syringyl units.The FTIR, 1H and 13 C NMR spectra showed both lignins belong to typical hardwood lignin. heartwood and sapwood were characterized by elemental analysis,FTIR, 1H and 13 C NMR spectroscopy.The results showed that the methoxyl content in heartwood lignin was 8.73% higher than that in sapwood lignin,and the C 9 empirical formula for heartwood lignin and sapwood lignin were C 9H 7 16 O 2 38 (OCH 3) 1 99 and C 9H 8 61 O 2 73 (OCH 3) 1 33 ,based on methoxyl and elemental analysis.The free aliphatic hydroxyl groups per C 9 unit (OH aliph ) were 78.2% in total numbers of hydroxyl groups of heartwood lignin,and the free phenolic hydroxyl groups(OH ph )were 21 8%.The OH aliph were 79 2% and the OH ph were 20 8% in sapwood lignin.The hearwood lignin showed 55 5% guaiacyl units and 44 5% syringyl units in the aromatic region.The sapwood lignin showed 61 3% guaiacyl units and 38 7% syringyl units.The FTIR, 1H and 13 C NMR spectra showed both lignins belong to typical hardwood lignin.
【Fund】: 国家“九五”攀登计划项目
【CateGory Index】: S781.4
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