Issue 23, 2022

A robust colorimetric aptasensor for the label-free detection of marine toxins based on tyrosine-capped gold nanoparticles

Abstract

PbTx-2 and okadaic acid (OA) are two typical marine toxins that are highly toxic and harmful to human health. The approach based on citrate-capped gold nanoparticles (Cit-AuNPs) and specific aptamers to construct label-free colorimetric sensors is a widely used method for marine toxin detection. However, the potential interactions between Cit-AuNPs and target molecules have always been ignored, which may result in wrong analytical results due to shortcomings in the Cit-AuNPs. To overcome these shortfalls, in this work, AuNPs were synthesized using tyrosine as a reducing and capping agent, and a robust colorimetric aptasensor based on tyrosine-capped AuNPs (Tyr-AuNPs) was constructed for the label-free detection of marine toxins. Tyr-AuNPs presented better stability compared to Cit-AuNPs due to the stronger binding of amine groups on tyrosine to AuNPs through the Au–N bond. Interactions between Tyr-AuNPs and PbTx-2 were analyzed through UV-vis and isothermal titration calorimetry methods and the results validated the robustness of the Tyr-AuNPs. Colorimetric aptasensors were established for PbTx-2 and OA detection with a linear range of 0.05–4 ppm and limits of detection of 2.25 ppb and 5.19 ppb, respectively. These results demonstrate that the developed colorimetric aptasensor can be a robust and promising method for marine toxin detection.

Graphical abstract: A robust colorimetric aptasensor for the label-free detection of marine toxins based on tyrosine-capped gold nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
23 ⵖⵓⵛ 2022
Accepted
16 ⴽⵜⵓ 2022
First published
20 ⴽⵜⵓ 2022

Analyst, 2022,147, 5314-5323

A robust colorimetric aptasensor for the label-free detection of marine toxins based on tyrosine-capped gold nanoparticles

L. Kong, X. Wang, C. Ma, S. Zhou, X. Sun, D. Jiang, T. Wang, H. Wan and P. Wang, Analyst, 2022, 147, 5314 DOI: 10.1039/D2AN01394K

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