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Mg2+- or Ca2+-regulated aptamer adsorption on polydopamine-coated magnetic nanoparticles for fluorescence detection of ochratoxin A

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Abstract

It has been observed that polyvalent metal ions can mediate the adsorption of DNA on polydopamine (PDA) surfaces. Exploiting this, we used two divalent metal ions (Mg2+ or Ca2+) to promote the adsorption of fluorescence-labelled ochratoxin A (OTA) aptamers on PDA-coated magnetic nanoparticles (Fe3O4@PDA). Based on the different adsorption affinities of free aptamers and OTA-bound aptamers, a facile assay method was established for OTA detection. The aptamers adsorbed on Fe3O4@PDA were removed via simple magnetic separation, and the remaining aptamers in the supernatant exhibited a positive correlation with the OTA concentration. The concentrations of Mg2+ and Ca2+ were finely tuned to attain the optimal adsorption affinity and sensitivity for OTA detection. In addition, other factors, including the Fe3O4@PDA dosage, pH, mixing order, and incubation time, were studied. Finally, under optimized conditions, a detection limit (3σ/s) of 1.26 ng/mL was achieved for OTA. Real samples of spiked red wine were analysed with this aptamer-based method. This is the first report of regulating aptamer adsorption on the PDA surface with polyvalent metal ions for OTA detection. By changing the aptamers, the method can be easily extended to other target analytes. 

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Funding

This work was supported by the CAS scientific instruments and equipment development program (Grant: YJKYYQ20200008) and the AI S&T Program of Yulin Branch, Dalian National Laboratory for Clean Energy, CAS (Grant No. DNL-YL A202203).

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Authors and Affiliations

  1. Department of Instrumentation and Analytical Chemistry, CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, People’s Republic of China

    Wei Yang, Lanxiu Ni, Mingzhen Zhu, Xiaobo Zhang & Liang Feng

  2. University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Mingzhen Zhu & Xiaobo Zhang

Authors
  1. Wei Yang
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  4. Xiaobo Zhang
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  5. Liang Feng
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Contributions

Wei Yang: Conceptualization, Methodology, Validation, Investigation, Visualization, Writing-Original Draft. Lanxiu Ni: Investigation, Validation. Mingzhen Zhu: Methodology, Investigation. Xiaobo Zhang: Methodology, Investigation. Liang Feng: Supervision, Writing-Review&Editing, Project administration, Funding acquisition.

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Correspondence to Liang Feng.

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Yang, W., Ni, L., Zhu, M. et al. Mg2+- or Ca2+-regulated aptamer adsorption on polydopamine-coated magnetic nanoparticles for fluorescence detection of ochratoxin A. Microchim Acta 191, 157 (2024). https://doi.org/10.1007/s00604-024-06252-0

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