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Molecular imprinting electrochemiluminescence sensor based on nitrogen-doped carbon quantum dots /Ru(bpy)3@SiO2 for the determination of citrinin

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Abstract

An electrochemiluminescence (ECL) sensor based on molecular imprinting polymer and SiO2 nanoparticles loaded Ru(bpy)3 and nitrogen-doped carbon quantum dots (NCQDs) is constructed for citrinin detection. The Ru(bpy)3 acts as ECL emitter, and the NCQDs cooperate with tri-n-propylamine (TPA) in solution as a coreactant to facilitate the luminescence. The citrinin imprinted poly(p-aminothiophenol) film is deposited on the surface of the luminophore by electrochemical method, which can immobilize the luminophore besides recognizing the target. The obtained ECL sensor exhibits high sensitivity, stability, and reproducibility. The change of ECL intensity and the logarithm of citrinin concentration display a good linear relationship in the range 1.0 to 100 pg mL−1, and the detection limit is 5 fg mL−1. When it is applied to the detection of citrinin contents in food sample (i.e., rice and millet) solutions, the RSD is less than 6.1%, and the recoveries for spiked standards range from 95.5 to 102.0%. Hence, this work provides a promising alternative for citrinin detection.

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Funding

This work was supported by the financial support of the National Natural Science Foundation of China (grant number 21775112).

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Authors and Affiliations

  1. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei Province, People’s Republic of China

    Yifei He, Tingting Wang, Jiangping Cao, Faqiong Zhao & Baizhao Zeng

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  1. Yifei He
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  3. Jiangping Cao
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  4. Faqiong Zhao
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Correspondence to Baizhao Zeng.

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He, Y., Wang, T., Cao, J. et al. Molecular imprinting electrochemiluminescence sensor based on nitrogen-doped carbon quantum dots /Ru(bpy)3@SiO2 for the determination of citrinin. Microchim Acta 190, 155 (2023). https://doi.org/10.1007/s00604-023-05735-w

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