High-sensitivity copper(II) sensor based on a protein/ion-imprinted polymer cooperative recognition strategy

文献类型： 外文期刊

第一作者： Zhang, Lianming

作者： Zhang, Lianming;Li, Dan;Li, Jianping;Li, Shuhuai;Ma, Xionghui;Wang, Mingyue

作者机构：

关键词： Dual recognition; Bovine serum albumin; Ion-imprinted polymer; Cu2+; Sensor

期刊名称：MICROCHEMICAL JOURNAL （ 影响因子：4.8； 五年影响因子：4.5 ）

ISSN： 0026-265X

年卷期： 2023 年 185 卷

页码：

收录情况： SCI

摘要： Despite the promise of ion imprinting technology for the development of electrochemical sensors for heavy metals, improved selectivity and stability are required for practical applications. Herein, a dual recognition strategy based on a protein and an ion-imprinted polymer (IIP) was proposed to develop highly sensitive sensors for copper(II) ions (Cu2+). On Bovine serum albumin (BSA) and graphene oxide (GO)-loaded gold nanoparticles (GO/Au NPs) modify the gold electrode surface, an a Cu2+ IIP was formed on the electrode by electro-polymerization. After Cu2+ was removed from IIP, the imprinted holes with a specific recognition ability for Cu2+ were obtained. In the prepared sensor, Cu2+ recognition sites were present in both BSA and the IIP, thus providing a dual recognition strategy for selective Cu2+ detection. Furthermore, owing to the amplification effect of GO/Au NPs, the sensor showed high sensitivity. With potassium ferricyanide/potassium ferrocyanide as a probe, the logarithm of the Cu2+ concentration was proportional to the sensor current response within the range of 1-8000 x 10-14 mol/L, and the detection limit was 1.12 x 10-15 mol/L. Moreover, for Cu2+ detection in actual samples, the sensor exhibited a recovery rate of 93.2-105.6 %.

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