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Ultrasensitive split-type electrochemical sensing platform for sensitive determination of organophosphorus pesticides based on MnO2 nanoflower-electron mediator as a signal transduction system

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Abstract

Organophosphorus pesticides (OPs) are extensively used worldwide as agrochemicals; however, excess use may threaten the health of humans. Thus, it is an urgent need to develop a sensitive method for determination of OPs. Herein, a simple and sensitive split-type electrochemical method was developed by using MnO2 nanoflower-electron mediator as a signal transduction element. The MnO2 nanoflower-electron mediator was synthesized and shows an excellent electrochemical signal attributed to the high specific surface area of MnO2 nanoflower. Meanwhile, the inhibition of OPs on butyrylcholinesterase (BChE) was carried out in the homogeneous system. In the absence of target molecule, a large number of thiocholines (TCh) were yielded from hydrolysis of acetylthiocholine (ATCh) by BChE. The MnO2 nanoflower was cracked, and subsequently, multiple electron mediator molecules were released from the platform after treated with TCh, thus decreasing the electrochemical response. Furthermore, the inhibition of OPs on BChE resulted in the reduced generation of TCh, thus inducing the recovery of electrochemical signal. Under the optimal experimental, dichlorvos can be detected in a wide range of 10−6–10−10 M, with a detection limit of 3 × 10−10 M. Moreover, the assay was successfully used to analyze dichlorvos in cucumber juice and pear juice, showing a great promising potential for detecting organophosphorus pesticides in complex samples.

In this assay, a split-type electrochemical biosensor was proposed for the ultrasensitive determination of organophosphorus pesticides based on the MnO2 nanoflower-electron mediator as an electrochemical signal component.

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Funding

This work was financially supported by the National Natural Science Foundation of China (21864013) and the Open Project Program of Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University (No. KLFS-KF-201917).

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Author notes

  1. Yuanfang Sun and Pengyuan Xiong contributed equally to this work.

Authors and Affiliations

  1. Department of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory of Functional Small Organic Molecule, Jiangxi Normal University, Nanchang, 330022, Jiangxi, China

    Yuanfang Sun, Pengyuan Xiong, Juan Tang & Zhiyao Zeng

  2. Department of Chemistry, Key Laboratory of Analysis and Detection for Food Safety (Ministry of Education of China and Fujian Province), Fuzhou University, Fuzhou, 350108, Fujian, China

    Dianping Tang

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  1. Yuanfang Sun
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  2. Pengyuan Xiong
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Correspondence to Juan Tang.

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Sun, Y., Xiong, P., Tang, J. et al. Ultrasensitive split-type electrochemical sensing platform for sensitive determination of organophosphorus pesticides based on MnO2 nanoflower-electron mediator as a signal transduction system. Anal Bioanal Chem 412, 6939–6945 (2020). https://doi.org/10.1007/s00216-020-02824-0

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  • DOI: https://doi.org/10.1007/s00216-020-02824-0

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