Abstract
Gold nanoparticles (AuNPs) with unique optical properties, such as easy operation and visualized assay, have a great ability to detect different types of analytes. In the present study, a novel AuNPs based aptasensor strategy for the detection of trinitrotoluene (TNT) was used. For this purpose, two different batches of AuNPs were functionalized by thiol modified DNA probes (P1 and P2) complementary to 5' and 3' ends of anti-TNT aptamer. Then, two batches of gold nanoprobes were mixed and the addition of anti-TNT aptamer induced the assembly and aggregation of nanoparticles. However, according to this strategy, in the presence of TNT, aptamer can bind to its target molecule (TNT) and prevent nanoparticles aggregation. The results indicate that the produced aptasensor can detect TNT molecule with high specificity (detection limit of 6 pM). In conclusion, this gold nanoparticle-based colorimetric anti-TNT aptasensor can be used in the next investigations with high efficiency.
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ACKNOWLEDGMENTS
The authors gratefully acknowledge Negar Nadafi for her significant contribution of this study.
Funding
The authors would like to gratefully acknowledge the research council of Tarbiat Modares University and Malek-Ashtar University of Technology for financial support.
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Barkheh, H., Zeinoddini, M., Ranjbar, B. et al. A Novel Strategy for Trinitrotoluene Detection Using Functionalized Gold Nanoparticles. J Anal Chem 76, 459–465 (2021). https://doi.org/10.1134/S1061934821040031
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DOI: https://doi.org/10.1134/S1061934821040031