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香草醛作为食品中一种重要的调味剂,可以从热带兰花香荚兰的种子中找到。本文以香草醛(VAN)为模板分子,a-甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,二甲基亚砜(DMSO)为溶剂,分别采用沉淀聚合法、悬浮聚合法、本体聚合法制备了香草醛分子印迹聚合物(微球)(MIPs)。通过紫外光谱(UV)、傅里叶变换红外光谱仪(FT-IR)研究了模板分子与功能单体之间的相互作用和最佳配比,利用透射电子显微镜考察了分子印迹聚合物的微观形貌。采用平衡和等温吸附实验对印迹聚合物的吸附性能进行了研究。实验表明,MAA与VAN之间通过氢键相互作用,沉淀聚合法制备的MIPs具有均匀规则的球状结构,且表现出对VAN更好的结合能力,具有较高的特异识别性。
Vanillin, an important flavor agent in foods, can be found in the seeds of the tropical orchid vanilla. In this paper, vanillin (VAN) as a template molecule, a-methacrylic acid (MAA) as a functional monomer, ethylene glycol dimethacrylate (EGDMA) as a crosslinking agent and dimethyl sulfoxide (DMSO) as a solvent Vanillin molecularly imprinted polymers (MIPs) were prepared by precipitation polymerization, suspension polymerization and bulk polymerization respectively. The interaction and the best ratio between the template molecule and the functional monomer were investigated by ultraviolet (UV) and Fourier transform infrared (FT-IR) spectroscopy. The microscopic morphology of the molecularly imprinted polymer was investigated by transmission electron microscopy appearance. Adsorption properties of imprinted polymers were studied by equilibrium and isothermal adsorption experiments. The experimental results show that the MIPs prepared by precipitation polymerization have a uniform and regular spherical structure through the hydrogen bonding interaction between MAA and VAN, and exhibit better binding ability to VAN with higher specific recognition.