杉木幼龄材与成熟材木质素的化学官能团和化学键特征研究

The Chemical Groups and Bonds Characterization of Juvenile Wood and Mature Wood Lignins of Chinese Fir

采用有机元素分析、红外光谱、质子核磁共振波谱对从杉木幼龄材和成熟材中提取的磨木木质素的化学官能团和化学键特征进行了研究。结果表明 :杉木幼龄材和成熟材木质素的经验式分别为C9H8 73O2 57(OCH3) 0 84 和C9H9 0 1 O2 2 4 (OCH3) 0 90 ;杉木幼龄材木质素的芳香环结构主要由愈疮木基组成 ,而在成熟材中除愈疮木基外还有紫丁香基基团存在 ;杉木成熟材的木质素中具有较多的芳香族化合物 ;杉木木质素结构中的主要键型为 β -O - 4键、β- 5键、β- β键和 β- 1键 ,且成熟材木质素中各种键型的数量均高于幼龄材。

The chemical groups and bonds characterization of lignins obtained from juvenile and mature of Chinese Fir were studied by elemental analysis, FTIR and 1H NMR spectroscopy. The results showed that the average per C 9 unit formulae of the juvenile and mature of Chinese Fir lignins obtained by acetosolv delignification were C 9H 8 73 O 2 57 (OCH 3) 0 84 and C 9H 9 01 O 2 24 (OCH 3) 0 90 respectively. The FTIR and 1H NMR spectra showed the aromatic skeletal of juvenile of Chinese Fir lignin mainly consisted by G rings and the aromatic skeletal of mature of Chinese Fir lignin had some type S ring structures except G rings and had more aromatic skeletal than that in juvenile wood. There were four types bonds in Chinese Fir lignin. They were β-O-4,β-5,β-β and β-1 In the mature wood, the bonds had a higher content than those in the juvenile wood.