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Chitosan-functionalized gold nanoparticles for colorimetric detection of mercury ions based on chelation-induced aggregation

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Abstract

We are presenting a colorimetric assay for mercury (II) ions. It is based on citosan-functionalized gold nanoparticles (AuNPs) that act as a signaling probe. Hg (II) induces the aggregation of the chitosan-AuNPs through a chelation reaction that occurs between chitosan and Hg (II). This results in a strong decrease of the absorbance of the modified AuNPs and a color change from red to blue. This sensing system displays excellent selectivity over other metal ions and a detection limit as low as 1.35 μM which is lower than the allowed level of Hg (II) in drinking water (30 μM) as defined by World Health Organization. The method is inexpensive, facile, sensitive, and does not require the addition of other reagents in order to improving sensitivity.

An inexpensive, facile, and ssensitive, colorimetric method for the detection of Hg (II) is presented.

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Acknowledgments

All authors gratefully acknowledge the financial support of Scientific Research Project of Beijing Educational Committee (KM201410028006) and the Natural Science Foundation of China (No. 21371123).

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Authors and Affiliations

  1. Department of Chemistry, Capital Normal University, Beijing, 100048, China

    Zhengbo Chen, Chenmeng Zhang, Yuan Tan, Tianhui Zhou, He Ma, Chongqing Wan, Yuqing Lin & Kai Li

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  1. Zhengbo Chen
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  2. Chenmeng Zhang
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  3. Yuan Tan
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  4. Tianhui Zhou
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  5. He Ma
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  6. Chongqing Wan
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  7. Yuqing Lin
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  8. Kai Li
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Correspondence to Zhengbo Chen.

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Chen, Z., Zhang, C., Tan, Y. et al. Chitosan-functionalized gold nanoparticles for colorimetric detection of mercury ions based on chelation-induced aggregation. Microchim Acta 182, 611–616 (2015). https://doi.org/10.1007/s00604-014-1365-8

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  • DOI: https://doi.org/10.1007/s00604-014-1365-8

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