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Paper matrix based array for rapid and sensitive optical detection of mercury ions using silver enhancement

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Abstract

The authors describe a nitrocellulose membrane based paper matrix array for detection of mercury(II) with high throughput and repeatability. A thymine-rich signal reporting ssDNA probe labeled with gold nanoparticles (AuNPs) was designed, and detection is based on the strong T-Hg-T interaction which leads to a significant color change. In addition, catalytic signal amplification is accomplished by silver staining in order to enhance coloration. The method has a detection limit as low 0.5 ppt. This is at least 500-fold better than that of existing methods. By using an array, multiple sets of duplicate detections can be carried out simultaneously and in parallel. This improves the efficiency and accuracy of the assay. The method shows remarkable specificity since the signal of other competing metal ions is negligible compared to that of mercury(II) even at 100-fold higher concentration. The protocol was successfully applied to the determination of Hg(II) in spiked tap water and lake water samples. In our perception, this assay is a most promising tool for optical determination f ultra-low levels of Hg(II).

Metal deposition based signal enhancement strategy is successful applied in the paper-matrix based array protocol for rapid and accurate detection of mercury ions. 500-fold amplification effect is achieved for mercury ion detection with the detection limit of 0.5 ppt by bare-eye observation.

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Acknowledgements

This work is financially supported by the NSFC grant of 21475030 and 31301460, the 12th Five Years Key Programs 2012BAK17B10, National and Zhejiang Public Benefit Research Project (2014C32051, 201510025).

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Authors and Affiliations

  1. School of Food Science and Engineering, Hefei University of Technology, Hefei, 230009, China

    Li Yao, Jun Teng, Hao Qu, Mengya Zhu, Lei Zheng & Wei Chen

  2. Jiangsu Entry-Exit Inspection and Quarantine Bureau, Nanjing, 210001, People’s Republic of China

    Feng Xue

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  1. Li Yao
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  3. Hao Qu
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  7. Wei Chen
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Correspondence to Wei Chen.

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Yao, L., Teng, J., Qu, H. et al. Paper matrix based array for rapid and sensitive optical detection of mercury ions using silver enhancement. Microchim Acta 184, 569–576 (2017). https://doi.org/10.1007/s00604-016-2052-8

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