论文部分内容阅读
通过比较和分析植物纤维中的主要成分木素、纤维素、半纤维素和提取物等模型物的近红外光谱图,发现在这些主要成分的吸收、同一成分中的C-H键基团和O-H键基团的吸收、不同结构的C-H键基团的吸收相互重叠,导致了植物纤维的近红外吸收光谱相互重叠而十分复杂。但也清楚地发现了木素与碳水化合物在C-H键的第一倍频区(1600～1800) nm有明显的吸收差别,木素的苯环在1668 nm处有吸收峰,而碳水化合物中因为没有苯环C-H键而没有发现有此吸收峰。另外,发现植物纤维及其中的主要成分在O-H键的第一倍频区1434 nm及合频区1920nm均有较强的吸收峰。这反映了植物纤维在近红外光谱区的信息比较丰富,为植物纤维的性质分析提供了理论基础。
By comparing and analyzing the near infrared spectra of the model compounds, such as lignin, cellulose, hemicellulose and extract, which are the main components of plant fiber, it was found that in the absorption of these main components, the CH bond group and the OH bond in the same component The absorption of groups and the absorption of CH bonds of different structures overlap each other, which leads to the complex near-infrared absorption spectra of plant fibers. However, it was also found clearly that there was a significant difference in the absorption between lignin and carbohydrates in the first octave band of CH bonds (1600-1800 nm). The benzene ring of lignin has an absorption peak at 1668 nm, whereas the carbohydrate No benzene ring CH bond and did not find this absorption peak. In addition, it was found that plant fibers and their major components have strong absorption peaks at the first frequency-doubled region of 1434 nm and the co-frequency region of O-H bonds at 1920 nm. This reflects that the plant fiber has abundant information in the near infrared spectrum and provides a theoretical basis for the analysis of the plant fiber properties.