毛白杨早材与晚材细胞壁区域木质素分布特性  

Lignin Distribution in Cell Wall Region of Early and Late Wood of Populus tomentosa Carrière

作　　者：周士乐 武书彬[1] ZHOU Shile;WU Shubin(State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《林产化学与工业》2024年第6期160-166,共7页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(32271807)。

摘　　要：采用激光扫描共聚焦显微镜(GLSM)和拉曼光谱技术,探究了毛白杨的早材和晚材各自的细胞壁区域木质素分布情况。研究结果表明:早材和晚材细胞壁木质素分布呈现明显的不均一性,木质素浓度高低顺序均为细胞角隅(CCML)、复合胞间层(CML)、次生壁(SW)。区域的木质素浓度比值(早材/晚材):次生壁内侧区域为0.76,次生壁中间区域为1.32,复合胞间层为1.39,细胞角隅为1.45,遵循着次生壁<复合胞间层<细胞角隅的规律。此外,探究了早材与晚材经低共熔溶剂DES处理后细胞壁木质素溶出行为,发现早材次生壁区域比细胞角隅和复合胞间层区域的木质素脱除更为显著,而晚材细胞角隅和复合胞间层区域比次生壁区域的木质素脱除更为显著。In this study,the distribution of lignin in the earlywood and latewood cell wall regions of Populus tomentosa Carrière was investigated by laser scanning confocal microscopy and Raman spectroscopy.The results showed that the distribution of lignin in earlywood and latewood cell wall showed obviously uneven distributed,and the order of lignin concentration from high to low was cell corner middle lamella(CCML),compound middle lamella(CML)and secondary wall(SW).The ratio of lignin concentration ratio(earlywood/latewood)were 0.76 for the inner SW,1.32 for the middle SW,1.39 for the CML and 1.45 for the CCML,which followed the pattern of SW<CML<CCML.In addition,the dissolution behavior of cell wall lignin in earlywood and latewood treated with deep eutectic solvent(DES)was investigated.The results showed that lignin removal was more significant in SW than CCML and CML region of earlywood,while the lignin removal in CCML and CML region of latewood was more significant than that in SW.

关 键 词：早材 晚材 激光拉曼光谱 细胞壁 区域木质素分布 低共熔溶剂 

分 类 号：TQ35[化学工程]