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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.

木材细胞壁是一种由纤维素、半纤维素、木质素和其他次要成分，如果胶和抽出物组成的复合材料。控制细胞壁功能性质的两个主要因素是S2层(最厚层)的纤维微纤丝角(MFA)和化学成分，如杨氏模数和生长应力。本研究采用小角X射线散射(SAXS)和傅立叶变换红外光谱(FT-IR)研究了样品的MFA和化学组成的变化。综上所述，从树干到树干顶端和上部，纤维素含量不断下降。一般情况下，零件的纤维素含量高于较低的零件。观察到细胞壁MFA的变化和细胞壁化学成分的微小变化。在针叶材和阔叶材中，这些变化似乎被很好地调节，以体现机械功能，以保持树枝的理想方向。我们检验了MFAs、化学成分和三个波数的测量峰高之间的相关性。在1034 cm~(-1)处的峰(纤维素)用于针叶木和阔叶木。此外，1219 cm~(-1)处的峰(木质素)用于针叶木材。在1239厘米-1(木聚糖)的峰，这是出现在硬木的特征，用于硬木。在针叶材中，MFAs与木质素含量呈正相关。MFAs与纤维素含量呈负相关。在……里面。阔叶木MFAs与纤维素含量的相关性不明显，但MFAs与木聚糖含量呈正相关。SR-X-射线实验在BL40B2，Spring-8，日本原马，项目编号2002A0250和2002B0440上进行。