Huang An-min, Zhou Qun, Fei Ben-hua, Sun Su-qin
Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2008 Aug;28(8):1749-52.
Poplar and Eucalyptus were identified fast by Fourier transform infrared spectroscopy (FTIR) combined with two-dimensional correlation spectroscopy (2D) in the present paper. The two kinds of wood were similar to each other in one-dimensional IR spectra but quite different in 2D FTIR spectra. In the range between 800 and 1500 cm(-1), they are similar and three strong auto-peaks were aroused around 1221, 954 and 879 cm(-1) in synchronous spectrum and four weak auto-peaks were aroused around 1470, 1150, 1105 and 1008 cm(-1), respectively. In the range between 1500 and 1800 cm(-1), one strong auto-peak appeared with Poplar around 1665 cm(-1) and one weak auto-peak appeared around 1600 cm(-1) in synchronous spectrum. They formed one pair of cross-peaks, whereas three auto-peaks not only at 1650 cm(-1) but also at 1725 and 1600 cm(-1) appeared with Eucalyptus and they became one 3 X 3 peak cluster. In addition, Eucalyptus has two weak auto-peaks at 1580, 1510 cm(-1) and four negative cross-peaks at (1725 and 1580 cm(-1), (1650 and 1580 cm(-1)), (1600 and 1580 cm(-1)) and (1510 and 1580 cm(-1)) and three positive cross-peaks at (1725 and 1510 cm(-1)), (1650 and 1510 cm(-1)) and (1600 and 1510 cm(-1)), respectively, which suggests that corresponding absorbance bands of Eucalyptus are more susceptive to the thermal perturbation than that of Poplar. The difference of 2D correlation between Eucalyptus and Poplar was obvious. The results proved that 2D correlation spectra could enhance the resolution of infrared spectra and increase the capacity of identification, which make it a powerful, rapid and new approach to identifying Eucalyptus and Poplar.
本文采用傅里叶变换红外光谱（FTIR）结合二维相关光谱（2D）快速鉴别了杨树和桉树。这两种木材的一维红外光谱相似，但二维FTIR光谱差异较大。在800至1500 cm(-1)范围内，它们相似，同步光谱中在1221、954和879 cm(-1)附近出现三个较强的自动峰，在1470、1150、1105和1008 cm(-1)附近分别出现四个较弱的自动峰。在1500至1800 cm(-1)范围内，杨树在同步光谱中1665 cm(-1)附近出现一个较强的自动峰，1600 cm(-1)附近出现一个较弱的自动峰，它们形成一对交叉峰；而桉树在1650、1725和1600 cm(-1)处出现三个自动峰，形成一个3×3的峰簇。此外，桉树在1580、1510 cm(-1)处有两个较弱的自动峰，在（1725和1580 cm(-1)）、（1650和1580 cm(-1)）、（1600和1580 cm(-1)）以及（1510和1580 cm(-1)）处有四个负交叉峰，在（1725和1510 cm(-1)）、（1650和1510 cm(-1)）以及（1600和1510 cm(-1)）处有三个正交叉峰，这表明桉树相应的吸收带比杨树对热扰动更敏感。桉树和杨树的二维相关性差异明显。结果证明，二维相关光谱可以提高红外光谱的分辨率，增加鉴别能力，使其成为鉴别桉树和杨树的一种强大、快速的新方法。
