Surface molecularly imprinted polymers prepared by two-step precipitation polymerization for the selective extraction of oleanolic acid from grape pomace extract
文献类型： 外文期刊
作者： Lu, Chunxia 1 ; Tang, Zonggui 2 ; Liu, Changbin 3 ; Ma, Xiaomei 3 ;
作者机构： 1.Yangtze Normal Univ, Life Sci & Technol Inst, Chongqing, Peoples R China
2.Xinjiang Acad Agr & Reclamat Sci, Anal & Testing Ctr, Shihezi, 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; two-step precipitation polymerization
期刊名称：JOURNAL OF SEPARATION SCIENCE （ 影响因子：3.645； 五年影响因子：2.943 ）
ISSN： 1615-9306
年卷期： 2018 年 41 卷 17 期
页码：
收录情况： SCI
摘要： Surface molecularly imprinted polymers were successfully prepared by a novel two-step precipitation polymerization method. The first-step allowed the formation of 4-vinylpyridine divinylbenzene and trimethylolpropane trimethacrylate copolymeric microspheres. In the second-step precipitation polymerization, microspheres were modified with a molecularly imprinting layer of oleanolic acid as template, methacrylic acid as functional monomer, and divinylbenzene/ethylene glycol dimethacrylate as cross-linker. The obtained polymers had an average diameter of 4.43m and a polydispersity index of 1.011; adsorption equilibrium was achieved within 40min, with adsorption capacity reaching 27.4mg/g. Subsequently, the polymers were successfully applied as the adsorbents of molecularly imprinted solid-phase extraction to separateand purifythe oleanolic acid from grape pomace. The content of oleanolic acid in the grape pomace extract was enhanced from 13.4 to 93.2% after using the molecularly imprinted solid-phase extraction process. This work provides an efficient way for effective oleanolic acid separation and enrichment from complex matrices, which is especially valuable in industrial production.
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