Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 214, Issue -, Pages 445-450Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2019.02.055
Keywords
Fluorescence; Nickel nanoclusters; Tartrazine; Green synthesis; Drink
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Funding
- National Science Foundation of China [NSFC-21864017, NSFC-21305061]
- Natural Science Foundation of Jiangxi Province [20181BAB213008, 20171BAB203018]
- Jiangxi Provincial Department of Education [GJJ160006, GJJ160204]
- Open Funds of the State Key Laboratory of Electroanalytical Chemistry [SKLEAC-201802]
- Open Project Program of State Key Laboratory of Food Science and Technology of Nanchang University [SKLF-KF-201810]
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In the work, water-soluble bovine serum albumin-protected fluorescent nickel nanoclusters (BSA-NiNCs) are used as fluorescent probes to construct a label-free fluorescence quenching sensor for sensitive and selective detection of tartrazine. The fluorescent BSA-NiNCs are synthesized in one pot using BSA as both the template and reducing agent, and hydrogen peroxide as the additive. The as-preparedNiNCs are characterized by using various analytical techniques like transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, UV-Vis absorption spectroscopy, circular dichroism spectroscopy, and fluorescence spectroscopy. The synthesized BSA-NiNCs have a quantum yield of ca. 8% by using quinine sulfate as a standard. The sensor for tartrazine detection shows a wide linear range of 0.01-3.5 mu M, with a low detection limit of 4 nM. The fluorescence quenching very likely results from the combination of the intermolecular interactions and the secondary inner filter effect between BSA-NiNCs and tartrazine. Then, the proposed sensor is successfully employed for tartrazine detection in drink samples, and the results are comparable with those based on a reference HPLC method. (C) 2019 Elsevier B.V. All rights reserved.
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