Innventia, Box 5604, 11428 Stockholm, Sweden.
Planta. 2011 Jun;233(6):1277-86. doi: 10.1007/s00425-011-1384-1. Epub 2011 Feb 22.
Polarisation Fourier transform infra-red (FTIR) microspectroscopy was used to characterize the organisation and orientation of wood polymers in normal wood and tension wood from hybrid aspen (Populus tremula × Populus tremuloides). It is shown that both xylan and lignin in normal wood are highly oriented in the fibre wall. Their orientation is parallel with the cellulose microfibrils and hence in the direction of the fibre axis. In tension wood a similar orientation of lignin was found. However, in tension wood absorption peaks normally assigned to xylan exhibited a 90° change in the orientation dependence of the vibrations as compared with normal wood. The molecular origin of these vibrations are not known, but they are abundant enough to mask the orientation dependence of the xylan signal from the S₂ layer in tension wood and could possibly come from other pentose sugars present in, or associated with, the gelatinous layer of tension wood fibres.
偏光傅里叶变换红外（FTIR）微光谱技术用于表征杂交白杨（欧洲山杨×欧洲黑杨）正常木材和拉伸木材中木材聚合物的组织和取向。结果表明，正常木材中的木聚糖和木质素在纤维壁中高度取向。它们的取向与纤维素微纤维平行，因此与纤维轴方向一致。在拉伸木材中发现了类似的木质素取向。然而，与正常木材相比，拉伸木材中通常分配给木聚糖的吸收峰的振动方向依赖性发生了 90°的变化。这些振动的分子起源尚不清楚，但它们足够丰富，可以掩盖拉伸木材 S₂层中木聚糖信号的取向依赖性，并且可能来自存在于拉伸木材纤维胶状层中的其他戊糖或与之相关的其他戊糖。
