Tyndall-Effect-inspired assay with gold nanoparticles for the colorimetric discrimination and quantification of mercury ions and glutathione
2022
Sun, Yao | Yuan, Kaijing | Mo, Xiaomei | Chen, Xuejiang | Deng, Yanan | Liu, Chang | Yuan, Yali | Nie, Jinfang | Zhang, Yun
This work initially reports a new nanosening method for simple, sensitive, specific, visual detection of mercury (II) (Hg²⁺) and glutathione (GSH) using the Tyndall Effect (TE) of the same colloidal gold nanoparticle (GNP) probes for efficient colorimetric signaling amplification. For the TE-inspired assay (TEA) method, arginine (Arg) molecules are pre-modified on the GNPs' surfaces (Arg-GNPs). Upon the Hg²⁺ introduction, it can be specifically coordinated with the terminal –NH₂ and –COOH groups of the Arg molecules to make the Arg-GNPs aggregate, producing a significantly-enhanced TE signal in the reaction solution after its irradiation by a 635-nm red laser pointer pen. On the other hand, the introduction of the GSH results in the production of the original Arg-GNPs’ weak TE response, as it is able to bind such metal ion via mercury-thiol reactions to inhibit the above aggregation. Under the optimal conditions, the utility of the new TEA method is well demonstrated to quantitatively detect the Hg²⁺ and GSH with the aid of a smartphone as a portable TE reader during the linear concentration ranges of 50–3000 and 10–3000 nM, respectively. The detection limits for the Hg²⁺ and GSH are estimated to be as low as ∼3.5 and ∼0.3 nM, respectively. The recovery results obtained from the detection of Hg²⁺ in the complex tap and pond water samples and the assay of GSH in real human serum and urine samples are also satisfactory.
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