棕榈酸分子结构及热变性研究

Study on Molecular Structure and Thermal Denaturation of Palmitic Acid

采用中红外(MIR)光谱技术开展了棕榈酸分子结构研究.试验发现棕榈酸分子的红外吸收模式主要包括:ν_(asCH3-棕榈酸)、ν_(sCH3-棕榈酸)、ν_(asCH2-棕榈酸)、ν_(sCH2-棕榈酸)、δ_(CH2-棕榈酸)、ρ_(CH2-棕榈酸)和ω_(CH2-棕榈酸).采用变温中红外(TD-MIR)光谱进一步开展了棕榈酸分子热变性研究.试验发现:在303 K~523 K的温度范围内,棕榈酸分子主要官能团对应的吸收频率及强度都有明显改变,进一步进行了棕榈酸分子热变性机理研究.拓展了MIR及TD-MIR光谱在棕榈酸分子结构及热变性的研究范围.

The palmitic acid molecular structure had been studied by middle infrared(MIR)spectroscopy.The infrared absorption modes of palmitic acid molecule includedνasCH3-palmitic acid,ν_(asCH2-palmitic acid),ν_(sCH3-palmitic acid),ν_(sCH2-palmitic acid),δ_(CH2-palmitic acid),ρ_(CH2-palmitic acid) andω_(CH2-palmitic acid).Temperature-dependent MIR(TD-MIR)spectroscopy of palmitic acid molecule were studied also in the temperature range of 303 K~523 K.With the increase of the temperature,the corresponding frequency and absorption intensity of palmitic acid molecule had changed obviously.The thermal denaturation mechanism was studied also.The paper demonstrated the key roles of MIR and TD-MIR spectroscopy in the analysis of structure and thermal denaturation of the palmitic acid.