Mapping of microfibril angles and chemical compositions in a tree.

绘制树木中的微纤维角度和化学成分。

基本信息

批准号：
14360099
负责人：
SUGIYAMA Junji
金额：
$ 9.66万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14360099/
关键词：
microfibril angle small angle X-ray scattering FT-IR

项目摘要

Wood cell walls are a composite material consisting of cellulose, hemicellulose, lignin and other minor components, such as pectin and extractives. Two main factors, cellulose microfibril angle (MFA) in S2 layer (thickest layer) and chemical composition, govern functional properties of the cell wall such as Young's modulus and growth-stress. In this study, change of MFA and chemical composition were investigated by small angle X-ray scattering (SAXS) and FT-IR. In summary, cellulose content decreases continuously from the trunk to the tip and upper. parts had generally more cellulose than, lower parts. Variation of MFA and small changes of chemical composition in cell wall were observed. In both softwood and hardwood, these changes seemed to be well regulated to manifest the mechanical function in order to keeping the branch in its ideal orientation. We examined the correlations between MFAs, chemical components and measured peak height at three wavenumbers. The peak at 1034cm-1 (cellulose) was used for both softwood and hardwood. Moreover, the peak at 1219cm-1 (lignin) was used for softwood. The peak at 1239 cm-1 (xylan), which appeared characteristically in hardwood, was used for hardwood. In softwood, the correlation of MFAs with lignin content was positive relationship. On the other hand, there was a negative correlation between MFAs and cellulose content. In. hardwood, although apparent correlation between MFAs and cellulose was not shown, the positive correlation between MFAs and xylan content could be seen. The SR-X-ray experiments were performed at BL40B2, Spring-8, Harima, Japan, Project number, 2002A0250 and 2002B0440.

木细胞壁是一种复合材料，由纤维素，半纤维素，木质素和其他次要成分（例如果胶和提取物）组成。两个主要因素：S2层（最厚）和化学成分中的纤维素微纤维角（MFA）控制细胞壁的功能特性，例如Young的模量和生长压力。在这项研究中，通过小角度X射线散射（SAXS）和FT-IR研究了MFA和化学组成的变化。总而言之，纤维素含量从躯干连续下降到尖端和上部。零件通常比较低的纤维素更多。观察到MFA的变化和细胞壁中化学成分的微小变化。在软木和硬木中，这些变化似乎受到很好的调节，以表现出机械功能，以使分支保持理想的方向。我们检查了MFA，化学成分与三个波数字的峰高之间的相关性。软木和硬木都使用了1034cm-1（纤维素）的峰值（纤维素）。此外，使用1219cm-1（木质素）的峰用于软木。在硬木中出现特征的1239 cm-1（Xylan）的峰用于硬木。在软木中，MFA与木质素含量的相关性是正相关的。另一方面，MFA和纤维素含量之间存在负相关。在。硬木尽管未显示MFA与纤维素之间的明显相关性，但可以看到MFA和Xylan含量之间的正相关。 SR-X射线实验是在日本Harima，Harima，2002A0250和2002B0440的BL40B2，Spring-8上进行的。