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首页> 外文期刊>Journal of Applied Polymer Science >Preparation of water-compatible molecularly imprinted polymers for caffeine with a novel ionic liquid as a functional monomer
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Preparation of water-compatible molecularly imprinted polymers for caffeine with a novel ionic liquid as a functional monomer

机译：以新型离子液体为功能单体制备水溶性咖啡因分子印迹聚合物

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Water-compatible molecularly imprinted polymers (MIPs) for caffeine were synthesized in aqueous medium with a new functional monomer, 1-(α-methyl acrylate)-3-methylimidazolium bromide (1-MA-3MI-Br), which had π-π and hydrogen-bonding interactions. Caffeine-imprinted polymers were prepared in suspension polymerization with 1-MA-3MI-Br and methacrylic acid (MAA), which only had hydrogen bonding, as a functional monomer. For the specific binding characteristics of the new functional monomer 1-MA-3MI-Br, the adsorption capacity and relative separation factor (β) of MIPs for caffeine were significantly enhanced. The maximum adsorption capacities of 1-MA-3MI-Br-MIP and MAA-MIP imprinted microspheres for caffeine were 53.80 and 28.90 μmol/g, respectively. Moreover, the relative separation factors were measured by comparison of the separation characteristics under competitive adsorption conditions. The results showed that the β of MAA-MIP for caffeine relative to theophylline was only 1.65; this showed a very poor recognition selectivity for caffeine, but β of 1-MA-3MI-Br-MIP for caffeine with respect to theophylline was remarkably enhanced to 3.19; this showed an excellent recognition selectivity and binding affinity toward caffeine molecules in an aqueous environment.
机译：在具有新的功能单体1-（α-丙烯酸甲酯）-3-甲基咪唑鎓溴化物（1-MA-3MI-Br）的水性介质中合成了咖啡因的水相容性分子印迹聚合物（MIP）。和氢键相互作用。在具有1-MA-3MI-Br和仅具有氢键的甲基丙烯酸（MAA）的悬浮聚合中，将咖啡因印记的聚合物用作功能单体。由于新型功能性单体1-MA-3MI-Br的特异性结合特性，MIPs对咖啡因的吸附能力和相对分离因子（β）显着提高。 1-MA-3MI-Br-MIP和MAA-MIP印迹微球对咖啡因的最大吸附容量分别为53.80和28.90μmol/ g。此外，通过比较竞争性吸附条件下的分离特性来测量相对分离因子。结果表明，咖啡因的MAA-MIP相对于茶碱的β仅为1.65;这表明对咖啡因的识别选择性很差，但是1-MA-3MI-Br-MIP对茶碱的茶碱相对于茶碱的β值显着提高到3.19。这表明在水性环境中对咖啡因分子具有出色的识别选择性和结合亲和力。

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