Functionalization of Silver Nanoparticles with Carbohydrate Derivative for Colorimetric Assay of Thiram
The surface of silver nanoparticles (Ag NPs) was functionalized with a carbohydrate derivative (glutathione-lactose, GSH-Lac) to form GSH-Lac-Ag NPs for sensing of thiram in real samples with a rapid and sensitive visual readout. This colorimetric assay of thiram relies on the change in the surface...
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Veröffentlicht in: | Journal of electronic materials 2021-06, Vol.50 (6), p.3676-3685 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The surface of silver nanoparticles (Ag NPs) was functionalized with a carbohydrate derivative (glutathione-lactose, GSH-Lac) to form GSH-Lac-Ag NPs for sensing of thiram in real samples with a rapid and sensitive visual readout. This colorimetric assay of thiram relies on the change in the surface plasmon resonance (SPR) band of the GSH-Lac-Ag NPs, resulting in their aggregation by thiram, which leads to a visual change of the GSH-Lac-Ag NPs from yellow to reddish brown. As a result, the SPR band of GSH-Lac-Ag NPs red-shifts from 406 nm to 458 nm, showing good linearity in the range of 0.01
µ
M to 3.00
µ
M (
R
2
= 0.9841) with a limit of detection (LOD) of 3.00 nM. Addition of other pesticides did not show a remarkable red-shift of the SPR band of the GSH-Lac-Ag NPs, indicating their high selectivity as a colorimetric sensor. This method enables a facile and portable analytical platform for on-site detection of thiram in real samples with minimum volume.
Graphic Abstract |
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ISSN: | 0361-5235 1543-186X |
DOI: | 10.1007/s11664-021-08875-y |