Cellular-level chemical changes in Japanese beech (Fagus crenata Blume) during artificial weathering
Cellular-level chemical changes in Japanese beech (Fagus crenata Blume) during artificial weathering
复制标题
DOI：
10.1515/hf-2020-0229
复制
发表时间：
2021-10-01
期刊：
影响因子：
2.4
通讯作者：
Kobayashi, Masahiko
中科院分区：
文献类型：
--
作者：
Kanbayashi, Toru;Matsunaga, Masahiro;Kobayashi, Masahiko
由于木材化学成分可以通过风化作用解聚和修饰，因此需要更好地了解控制这些过程的机制，以开发有效的木材表面保护方法。不幸的是，很少有关于木材，特别是硬木在风化过程中微观尺度化学变化的报道。本研究的目的是在细胞水平上确定日本山毛榉（Fagus crenata Blume）在人工风化作用下的降解行为。利用微拉曼光谱和化学作图分析，研究了木材成分在风化过程中的结构和微观分布变化。拉曼光谱表明，风化有利于木质素的降解和改性。木质素的降解行为随木材组织类型的不同而不同。木质素还原速率由高到低依次为：血管元件>轴向薄壁细胞>木纤维。拉曼图确定了不同树种的表层木质素的细胞水平还原是不同的。虽然杉木管胞的木质素降解从表面和细胞腔中进行，但山毛榉纤维的木质素降解是根据深度而进行的。
Since wood chemical components can be depolymerized and modified by weathering, a better understanding of the mechanisms governing these processes in needed to develop effective protection methods for wood surfaces. Unfortunately, very little has been reported about the micro-scale chemical changes in wood, particularly hardwood, during weathering. The purpose of the present work is to determine the degradation behavior of Japanese beech (Fagus crenata Blume) under artificial weathering at the cellular-level. Herein, the structural and micro-distributional changes in wood components during weathering were investigated using micro-Raman spectral and chemical mapping analyses. The Raman spectra showed that weathering facilitated lignin degradation and modification. The degradation behavior of lignin differed depending on the type of wood tissue. The rate of lignin reduction followed a descending order: vessel element > axial parenchyma cell > wood fiber. Raman mapping determined that cellular-level lignin reduction on the surface layers differed for wood species. Although lignin degradation of cedar tracheids proceeded from both the surface and the cell lumen, the lignin in beech fibers degraded according to the depth.