Trypsin encapsulated gold-silver bimetallic nanoclusters for recognition of quinalphos via fluorescence quenching and of Zn2+ and Cd2+ ions via fluorescence enhancement
- Authors
- Akavaram, Soujanya; Desai, Mittal L.; Park, Tae-Jung; Murthy, Z.V.P.; Kailsa, Suresh Kumar
- Issue Date
- Apr-2021
- Publisher
- Elsevier B.V.
- Keywords
- Au- Ag NCs; Cd2+ ion; Quinalphos; Trypsin; UV–visible and fluorescence spectroscopic techniques; Zn2+ ion
- Citation
- Journal of Molecular Liquids, v.327
- Journal Title
- Journal of Molecular Liquids
- Volume
- 327
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/43738
- DOI
- 10.1016/j.molliq.2020.114830
- ISSN
- 0167-7322
1873-3166
- Abstract
- In this work, gold‑silver bimetallic nanoclusters (Au[sbnd]Ag NCs) were produced via a simple synthetic approach by using trypsin as a ligand. The synthesized bimetallic nanoclusters have high intensity and shown red fluorescence. The trypsin-encapsulated Au[sbnd]Ag bimetallic NCs exhibit emission peak at 418 nm and 665 nm at excitation of 350 nm. The trypsin-decorated Au[sbnd]Ag NCs were successfully applied as probes for fluorescence “turn-off” for quinalphos and “turn-on” for Cd2+ and Zn2+ ions. Under optimal conditions, multiple analytes i.e., quinalphos, Cd2+ and Zn2+ ions were detected and exhibited linear range from 1.0 to 100 μM, achieved detection limits at nanomolar concentration. Attractively, the present study provides a new analytical strategy for multiple pollutants assay of quinalphos via fluorescence “turn-off” and of Cd2+ and Zn2+ ions via fluorescence “turn-on” mechanisms. The practicability of the method is validated by quantifying quinalphos, Cu2+ and Zn2+ ions from food and environmental samples. © 2020
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