7种针叶树材红外光谱(FTIR)特征的比较与分析

使用傅立叶红外光谱(FTIR)对樟子松、银杏等7种针叶树材的木材样本进行了检测和分析。结果表明,7种木材反映木质素、纤维素和半纤维素的主要吸收峰出峰位置接近,如3333~3437 cm~(-1)范围的O-H伸缩振动吸收峰、2917~2933 cm~(-1)处的C-H伸缩振动吸收峰、1694~1737 cm~(-1)附近的C=O伸缩振动、1510~1513 cm~(-1)苯环碳骨架振动振动吸收峰等;在1265~1275 cm~(-1)处均有明显的强峰,说明愈疮木基丙烷是木质素的主要组分;但三尖杉、柳杉、柏木和银杏均表现出含有紫丁香基木质素的特征。树脂、挥发油等成分对樟子松、柏木和柳杉的特征吸收峰的位置及强度产生了一定的影响。7种木材均有能够反映物种特性的吸收峰,如南方红豆杉在2896 cm~(-1)附近的2933 cm~(-1)处有个较小的肩峰,柳杉在1108 cm~(-1)处形成特有吸收峰,樟子松在3078、2654和2537 cm~(-1)处具特有吸收峰等等,均可用做木材的识别特征峰。

Comparison of FTIR spectra?in seven conifer softwood samples

Seven conifer softwood samples including Pinus sylvestris and Ginkgo biloba were analyzed using Fourier transform infrared spectroscopy (FTIR). Results showed that the main FTIR absorption peaks of lignin, cellulose and hemicellulose of the seven samples are close to each other, such as, the stretching vibration absorption peaks of O-H structure range of 3333-3437 cm^-1, C-H structure range of 2917-2933 cm^-1, C=O structure range of 1694-1737 cm^-1 and benzene carbon skeleton range of 1510-1513 cm^-1. An obviously strong peak near the position of 1265-1275 cm^-1 indicated that guaiacum propane is the main component of lignin, and Cephalotaxus fortunei, Cryptomeria fortunei, Cupressus funebris and Ginkgo biloba all contain syringyl lignin. The results also showed that resin and volatile oil contents might impact the position of the characteristic absorption peaks and the strength of Pinus sylvestris, Cryptomeria fortunei, and Cupressus funebris. All seven wood samples have their characteristic absorption peaks. For example, Taxus chinensis showed a small acromion at 2933 cm^-1 near 2896 cm^-1, Cryptomeria fortunei showed characteristic absorption peak at 1108 cm^-1, and Pinus sylvestris had the peak at the position of 3078 cm^-1, 2654 cm^-1 and 2537cm^-1 They can be used as the unique peaks to identify different woods.