Abstract
Objective
To investigate a simple, cost-effective and eco-friendly method for colorimetric detection of Hg2+ using gold nanoparticles (AuNPs) synthesized by Trichosporon montevideense WIN.
Results
Hg2+ induced more visible blue shift of SPR band of the AuNPs than other heavy metal ions including Pb2+, Cd2+, Fe3+, Mn2+, Co2+ and Cu2+. The λmax of SPR band exhibited a gradual blue shift from 548 to 537 nm with concentration of Hg2+ increasing (0–200 µM), and the absorbance ratio (A537/A548) showed a positive linear correlation with Hg2+ concentration (R2 = 0.96). AuNPs synthesized at pH 6 showed more obvious blue shift than at pH 5 and pH 7. Through Fourier transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM) analysis, biomolecules coated on the AuNPs were speculated to dominate the formation of a core (Au)-shell (Hg) structure, which resulted in the colorimetric response.
Conclusion
A sensitive and selective approach to detect Hg2+ using AuNPs synthesized by Trichosporon montevideense WIN is reported for the first time, which can provide a new potential candidate for detecting Hg2+ in the future.
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Acknowledgements
This work was supported by the Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (No. QAK201943) and the National Natural Science Foundation of China (No. 31970107).
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Wang, R., Zhang, H., Zhang, X. et al. Colorimetric detection of Hg2+ using gold nanoparticles synthesized by Trichosporon montevideense WIN. Biotechnol Lett 42, 1691–1697 (2020). https://doi.org/10.1007/s10529-020-02885-2
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DOI: https://doi.org/10.1007/s10529-020-02885-2