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首页> 外文期刊>RSC Advances >A simple and sensitive sensor based on a molecularly imprinted polymer-modified carbon paste electrode for the determination of curcumin in foods
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A simple and sensitive sensor based on a molecularly imprinted polymer-modified carbon paste electrode for the determination of curcumin in foods

机译：基于分子印迹聚合物修饰的碳糊电极的简单灵敏传感器，用于测定食品中的姜黄素

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摘要

A highly sensitive and selective molecularly imprinted polymer-modified carbon paste electrode (MIP-CPE) was designed. The curcumin molecularly imprinted polymer (CUR-MIP) was prepared by thermally induced precipitation polymerization, using curcumin (CUR) as the template molecule, methacrylic acid (MAA) as the functional monomer, 2,2′-azodiisobutyronitrile (AIBN) as the initiator, and ethylene glycol dimethacrylate (EDGMA) as the cross-linker. The modified electrode was prepared by mixing the polymer, graphite powder, and paraffin oil in specific proportions. The electrochemical behaviour of CUR on this electrode was studied, and a method for direct CUR determination using this electrode was established. The results showed that CUR exhibited a distinct oxidation peak (Epa) at 0.434 V (vs. SCE) in the mixed phosphate buffer solution (PBS) at pH 3.06. The optimum addition ratio of the polymer in the modified electrode was 20%, and the peak current (Ipa) was 4.5-fold higher than that of the bare CPE. The Ipa showed a good linear relationship with concentration in the range 0.1–50 μM, and the detection limit was 10.1 nM. The method was applied to determine CUR contents in food, giving recovery rates of 90.77–105.7%.
机译：设计了一种高灵敏度和选择性的分子印迹聚合物改性碳糊电极（MIP-CPE）。以姜黄素（CUR）为模板分子，甲基丙烯酸（MAA）为功能单体，2,2'-偶氮二异丁腈（AIBN）为引发剂，通过热诱导沉淀聚合法制备姜黄素分子印迹聚合物（CUR-MIP）。 ，以及乙二醇二甲基丙烯酸酯（EDGMA）作为交联剂。通过将聚合物，石墨粉和石蜡油按特定比例混合来制备改性电极。研究了CUR在该电极上的电化学行为，并建立了使用该电极直接测定CUR的方法。结果表明，CUR在0.434 V（ vs。 SCE）处表现出明显的氧化峰（ E pa ）。在pH 3.06的混合磷酸盐缓冲溶液（PBS）中溶解。聚合物在改性电极中的最佳添加比例为20％，峰值电流（ I pa ）比其高4.5倍。裸CPE的价格。 I pa 与浓度在0.1-50μM之间的线性关系良好，检出限为10.1 nM。该方法用于测定食品中的CUR含量，回收率为90.77–105.7％。

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