Assembly of 6-aza-2-thiothymine on gold nanoparticles for selective and sensitive colorimetric detection of pencycuron in water and food samples
- Authors
- Kailasa, Suresh Kumar; Thang Phan Nguyen; Baek, Seung Hoon; Le Minh Tu Phan; Rafique, Rafia; Park, Tae Jung
- Issue Date
- Dec-2019
- Publisher
- ELSEVIER
- Keywords
- Pencycuron; ATT-AuNPs; UV-Visible spectrometry; DLS; Electron microscopy
- Citation
- TALANTA, v.205
- Journal Title
- TALANTA
- Volume
- 205
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/82867
- DOI
- 10.1016/j.talanta.2019.06.087
- ISSN
- 0039-9140
- Abstract
- A facile and novel nanosensor analytical strategy was developed for the colorimetric detection of pencycuron fungicide in rice, potato, cabbage, and water samples based on the pencycuron-induced aggregation of 6-aza-2-thiothymine-functionalized gold nanoparticles (ATT-AuNPs). The ATT-AuNPs exhibited good stability and were characterized with UV-visible spectroscopy, Fourier transform infrared (FT-IR) spectrometry, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), and zeta potential techniques. The addition of pencycuron facilitated strong non-covalent interactions (electrostatic, van der Waals, and H bonding) between pencycuron and ATT-AuNPs, inducing a significant red shift in the surface plasmon resonance (SPR) peak of ATT-AuNPs along with a color change from red to blue. A linear equation was established between absorption ratio (A(720)/A(528)) and pencycuron concentration (2.5-100 mu M) with a correlation coefficient (R-2) of 0.9915. The detection limit was calculated to be 0.42 mu M, which was much lower than that of other analytical methods. The designed ATT-AuNP serves as a promising nanosensor for the rapid, simple, and selective label-free colorimetric detection of pencycuron in rice, potato, cabbage, and water samples, is highly sensitive, and does not require sophisticated instruments, tedious sample preparations, and time-consuming separation and pre-concentration procedures.
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