Preparation and evaluation of magnetic graphene oxide molecularly imprinted polymers (MIPs-GO-Fe3O4@SiO2) for the analysis and separation of tripterine

分子印迹聚合物 石墨烯 材料科学 热重分析 甲基丙烯酰胺 化学工程 朗缪尔吸附模型 傅里叶变换红外光谱 聚合物 吸附 聚合 化学 单体 乙二醇二甲基丙烯酸酯 甲基丙烯酸 有机化学 选择性 纳米技术 催化作用 复合材料 工程类 丙烯酰胺
作者
Qing Chen,Xinmei Liu,Huayu Yang,Shuyi Zhang,Hua Song,Xuan Zhu
出处
期刊:Reactive & Functional Polymers [Elsevier]
卷期号:169: 105055-105055 被引量:21
标识
DOI:10.1016/j.reactfunctpolym.2021.105055
摘要

In this study, the novel magnetic molecularly imprinted polymers (MMIPs) with a specific tripterine recognition ability have been synthesized via molecular imprinting technology. The MMIPs were prepared using graphene oxide (GO) with Fe 3 O 4 nanoparticles coated with silica shell as the magnetic component, tripterine as the template molecule, methacrylamide (MAM) as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linker, acetonitrile (ACN) as the pore-forming agent, and 2,2′-azobisisobutyronitrile (AIBN) as the initiator. Several polymerization parameters were systematically investigated, including the ratio of template/functional monomer/cross-linker, the dosage of the pore-forming agent and the initiator, and the time of prepolymerization. The morphology, structure and stability of the resultant MMIPs were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Saturation magnetization value of MIPs was 37.10 emu/g by superconducting quantum interference magnetometer, exhibiting good magnetic property. The selectivity, separation performance and adsorption mechanism were also studied. These results showed that MIPs exhibit good recognition of tripterine compared to non-imprinted polymer (NIPs). The binding process of MIPs was very fast and the maximum adsorption capacity to tripterine was 30.73 mg/g. Pseudo-second-order kinetic model fitted well with the kinetic data and binding isotherm was well described by Langmuir isotherm model. HPLC-UV analysis results revealed the application of MIPs was sufficiently specific, rapid and sensitive in the extraction, separation and quantitative determination of tripterine. This work also provided an important reference for the separation, enrichment and purification of specific constituent in complicated Traditional Chinese medicine (TCM) samples. • The MMIPs of tripterine were first successfully prepared by molecular imprinting technology using GO–Fe 3 O 4 @SiO 2 as carrier. • The MMIPs showed excellent recognition and accurate selection properties toward tripterine over analogues from TCM samples. • The adsorption process of MMIPs exhibited sensitive and quick response according the kinetic data and binding isotherm. • The MMIPs provide a quick and simple method for complex TCM samples or in vivo analysis of tripterine.
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