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首页> 外文期刊>Separation and Purification Technology >Molecularly imprinted polymers prepared by precipitation polymerization and used for inducing crystallization of oleanolic acid in supercritical CO2
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Molecularly imprinted polymers prepared by precipitation polymerization and used for inducing crystallization of oleanolic acid in supercritical CO2

机译：通过沉淀聚合制备的分子印迹聚合物，用于诱导齐墩果酸在超临界CO2中结晶

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摘要

In the present paper, molecularly imprinted polymers (MIPs) were prepared by precipitation polymerization, using oleanolic acid (OA) as template, acrylamide (AM) as functional monomer, ethylene glycol dimethacrylate (EGDMA) as cross-linker and azobisisobutyronitrile (AIBN) as initiator in a mixture solvent of chloroform and methanol. The influence of the ratio of template molecule, functional monomer and cross-linker on the MIPs was investigated. Scanning electron micrograph (SEM), laser diffraction particle size analyzer and Fourier transform infrared spectroscopy (FT-IR) were used to characterize the MIPs. The optimum ratio of template molecule, functional monomer and cross-linker was 1:4:20. The average size of the MIPs was 23 urn. Through the adsorption kinetic experiments, the static adsorption experiments and the specific adsorption experiments, it was found that the MIPs had good specific selectivity. The MIPs were used for inducing crystallization of OA in supercritical CO2. The crystallization rate of OA reached 93.1%, and the purity of OA was 95.7%. The results indicated that the MIPs showed good specific adsorption properties and the ability to induce crystallization of OA in supercritical CO2.
机译：以齐墩果酸（OA）为模板，丙烯酰胺（AM）为功能单体，乙二醇二甲基丙烯酸酯（EGDMA）为交联剂，偶氮二异丁腈（AIBN）为沉淀聚合物，通过沉淀聚合制备分子印迹聚合物（MIPs）。引发剂在氯仿和甲醇的混合溶剂中。研究了模板分子，功能单体和交联剂的比例对MIPs的影响。使用扫描电子显微镜（SEM），激光衍射粒度分析仪和傅立叶变换红外光谱（FT-IR）来表征MIP。模板分子，功能单体和交联剂的最佳比例为1：4：20。 MIP的平均大小为23 was。通过吸附动力学实验，静态吸附实验和比吸附实验，发现MIP具有良好的比选择性。 MIP被用于诱导OA在超临界CO 2中的结晶。 OA的结晶率达到93.1％，OA的纯度为95.7％。结果表明，MIPs在超临界CO2中表现出良好的比吸附性能和诱导OA结晶的能力。

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