Journal
METHODS
Volume 116, Issue -, Pages 141-148Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ymeth.2017.01.004
Keywords
Quantum dots; Indium phosphide (InP); Cadmium-free; Lateral flow immunoassay; QD@SiO2; Mycotoxins
Funding
- Russian Science Foundation [14-13-00229]
- European Commission via the Marie-Sklodowska Curie action Phonsi [H2020-MSCA-ITN-642656]
- Belgian Science Policy Office [IAP 7.35]
- Ghent University [GOA 01G01513]
- Russian Science Foundation [14-13-00229, 17-13-00044] Funding Source: Russian Science Foundation
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A sensitive tool for simultaneous qualitative detection of two mycotoxins based on use of non-cadmium quantum dots (QDs) is presented for the first time. QDs have proven themselves as promising fluorescent labels for biolabeling and chemical analysis. With an increasing global tendency to regulate and limit the use of hazardous elements, indium phosphide (InP) QDs are highlighted as environmentally-friendly alternatives to the highly efficient and well-studied, but potentially toxic Cd-and Pb-based QDs. Here, we developed water-soluble InP QDs-based fluorescent nanostructures. They consisted of core/shell InP/ZnS QDs enrobed in a silica shell that allowed the water solubility (QD@SiO2). Then we applied the QD@SiO2 as novel, silica shell -encapsulated fluorescent labels in immunoassays for rapid multiplexed screening. Two mycotoxins, zearalenone and deoxynivalenol, were simultaneously detected in maize and wheat, since the two QD@SiO2 labelled conjugates emit at two different, individually detectable wavelengths. The cutoff values for the simultaneous determination were 50 and 500 mu g kg(-1) for zearalenone and deoxynivalenol, respectively, in both maize and wheat. Liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) was used to confirm the result. (C) 2017 Elsevier Inc. All rights reserved.
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