用付立叶变换红外光谱研究了L—鼠李糖的变温远红外光谱,发现糖类分子在远红外区有许多特征吸收峰.当温度低到60℃时,光谱几乎无变化;65℃时,各峰强度大大减弱,但没有峰消失;75℃时,有7个峰消失.这些消失的峰与体系中氢键振动和晶格振动有关,反映了体系中分子的构象变化. The Fourier transform infrared spectroscopy (FTIR) was used to study the variable-temperature far-infrared spectroscopy of L-rhamnose. It was found that there were many characteristic absorption peaks in the far infrared region of carbohydrate molecules. When the temperature was as low as 60 ℃, , The intensity of each peak weakened greatly, but no peak disappeared, and seven peaks disappeared at 75 ℃ .These disappearing peaks were related to hydrogen bond vibration and lattice vibration in the system, which reflected the conformational changes of the molecules in the system.