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Preparation and characterization of monodisperse molecularly imprinted polymers for the recognition and enrichment of oleanolic acid

文献类型： 外文期刊

作者： Tang, Zonggui 1 ; Liu, Changbin 2 ; Wang, Jing 1 ; Li, Hongmin 1 ; Ji, Yong 1 ; Wang, Guohong 1 ; Lu, Chunxia 1 ;

作者机构： 1.Xinjiang Acad Agr & Reclamat Sci, Anal & Testing Ctr, Wuyi Rd 221, Shihezi 832000, Peoples R China

2.Xinjiang Acad Agr & Reclamat Sci, Inst Anim Husb & Vet Sci, Wuyi Rd 221, Shihezi 832000, Peoples R China

3.Xinjiang Acad Agr & Reclamat Sci, Key Labs Sheep Breeding & Reproduce, Wuyi Rd 221, Shihezi 832000, Peoples R China

关键词： Molecularly imprinted polymers;Oleanolic acid;Precipitation polymerization

期刊名称：JOURNAL OF SEPARATION SCIENCE （ 影响因子：3.645； 五年影响因子：2.943 ）

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收录情况： SCI

摘要： Monodisperse molecularly imprinted polymers for oleanolic acid were successfully prepared by a precipitation polymerization method using oleanolic acid as a template, methacrylic acid as a functional monomer, and divinylbenzene/ethylene glycol dimethacrylate as a crosslinker in a mixture of acetonitrile and ethanol (3:1, v/v). The imprinted polymers and nonimprinted polymers were characterized by using scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The resulting imprinted polymers had average diameters of 3.15 mu m and monodispersity values of 1.024. The results clearly demonstrate that use of ethanol as a cosolvent is indeed exceedingly effective in promoting the dissolution of oleanolic acid and in obtaining uniform microspheres. Molecular recognition properties and binding capability to oleanolic acid were evaluated by adsorption testing, which indicated that the imprinted polymers displayed optimal binding performance with a maximum adsorption capacity of 17.3 mg/g and a binding saturation time of 80min. Meanwhile, the produced imprinted polymers exhibited higher selectivity to oleanolic acid than that for ursolic acid and rhein. Herein, the studies can provide theoretical and experimental references for the oleanolic acid molecular imprinted system.

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