Abstract:

The cellulolase lignin structures of normal and compression wood of Masson Pine （Pinus massoniana）were studied comparatively by UV,FTIR,NMR,GPC and elemental analysis.The results showed that the aromatic skeletals of lignin in normal and compression wood mainly consisted by guaiacylpropane and some p-hydroxyphenylpropane units.They had a large number of aliphatic hydroxyl.Compared with the lignin of normal wood,the contents of p-hydroxyphenypropane units and phenolic hydroxyl groups were higher in the lignin of compression wood,however,the contents of methoxyl,carboxyl,β-O-4,β-5,β-β,and β-1 were lower.The contents of condensed,p-hydroxyl and syringyl phenolic hydroxyl in the lignin of compression wood were higher than those of the lignin of normal wood.The average per-C₉-unit formulae of the lignin in normal and compression wood of Masson Pine were C₉ H_7.27 O_1.53 （OH）^pH_0.19 （OH）^A1_1.18 （OCH₃）_1.23 and C₉H_7.28O_1.54 （OH）^pH_0.20 （OH）^A1_1.17 （OCH₃）_1.13 respectively.

Key words: Pinus massoniana, compression wood, lignin, UV, FTIR, NMR