Journal
ANALYTICAL LETTERS
Volume 52, Issue 5, Pages 729-744Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00032719.2018.1490311
Keywords
Fourier transform infrared (FT-IR) spectroscopy; 3-mercaptopropionic acid (MPA); N-ethylmaleimide; oleic acid; quantum dots (QDs); transmission electron microscopy (TEM)
Categories
Funding
- National Natural Science Foundation of China [31301471]
- Fundamental Research Funds for the Central Universities [16CX02042A]
- Applied Basic Research Programs of Qingdao [16-5-1-81-jch]
- Shandong Provincial Natural Science Foundation, China [ZR2018BC057]
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Quantum dots (QDs) have attracted great interest in fluorescence sensing. However, due to the surface passivation of QDs, it is still challenging to develop a sensing method based on the direct use of QD without the involvement of molecular recognition receptors. In this work, a very simple but practical strategy for highly passivated commercial CdSe/ZnS core-shell QDs is proposed to directly determine phosphorothiolate pesticides. This strategy is based on the fact that thiophosphorus hydrolyzates, formed in the alkaline hydrolysis of phosphorothiolates, strongly quench the fluorescence emission of the QDs by an electron transfer mechanism. The design is very easy to implement, requiring only the addition of the analyte into the quantum dot solution at room temperature. The 'light-off' response shows a wide linear range from 0.0001 to 160 mu g mL(-1) with a detection limit of approximately 0.0967 ng mL(-1) (0.00012 mg kg(-1)), which is considerably lower than the maximum residue limit of 0.01 mg kg(-1) allowed by the European Union. More importantly, ethion may be determined directly in fortified tomatoes by this protocol, demonstrating potential broad applications in food quality control.
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