Molecularly imprinted fluorescence assay based on lead halide perovskite quantum dots for determination of benzo(a)pyrene

文献类型： 外文期刊

第一作者： Liu, Li

作者： Liu, Li;Peng, Maomin;Xia, Hong;Peng, Xitian;Peng, Lijun;Liu, Li;Peng, Maomin;Xia, Hong;Peng, Xitian;Peng, Lijun;Liu, Li;Zhang, Jin Z.;Xu, Ke

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关键词： Lead halide perovskite; Quantum dots; Molecularly imprinted polymers; Benzo(a)pyrene; Fluorescence assay

期刊名称：MICROCHIMICA ACTA （ 影响因子：5.7； 五年影响因子：5.4 ）

ISSN： 0026-3672

年卷期： 2023 年 190 卷 10 期

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收录情况： SCI

摘要： Molecularly imprinted polymers with methylammonium lead halide perovskite quantum dots (MIP@MAPbBr(3) PQDs) have been prepared and applied to the determination of benzo(a)pyrene (BaP) for the first time. The photoluminescence (PL) of MIP@MAPbBr(3) PQDs was enhanced due to the surface passivation of defects by BaP. PL excitation and emission spectra, X-ray diffraction, Fourier transform infrared, and time-resolved PL studies suggest that the interaction between MIP@MAPbBr(3) PQDs and BaP is a dynamic process. After MIP@MAPbBr(3) PQDs were incubated with BaP, the benzene ring in the molecular structure of BaP can interact with MIP@MAPbBr(3) PQDs through p electrons, which reduces non-radiative recombination of MIP@MAPbBr(3) PQDs and lengthens excited state lifetime. The PL intensity of the MIP@MAPbBr(3) PQDs-BaP system was monitored at 520 nm with 375 nm excitation. Under optimized conditions, the PL intensity of MIP@MAPbBr3 PQDs is linear with the concentration of BaP in the 10 to 100 ngng center dot mL(-1) range, with a detection limit of 1.6 ng center dot mL(-1). The imprinting factor was 3.9, indicating excellent specificity of MIP@MAPbBr(3) PQDs for BaP. The MIP@MAPbBr(3) PQDs were subsequently applied to the PL analysis of BaP in sunflower seed oil, cured meat, and grilled fish samples, achieving recoveries from 79.3 to 107%, and relative standard deviations below 10%. This molecularly imprinted fluorescence assay improves the selectivity of BaP in complex mixtures and could be extended to other analytes.

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