Journal
FOOD CHEMISTRY
Volume 282, Issue -, Pages 141-146Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2019.01.011
Keywords
Ochratoxin A; DNA walking machine; Electrochemiluminescence aptasensor; Electrochemiluminescence resonance energy transfer; Mycotoxins
Funding
- National Key Research and Development Program of China [2018YFC1602800]
- National Natural Science Foundation of China [21775019, 21475020]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [2242018K3DN04]
- Open Project of The Key Laboratory of Modern Toxicology of Ministry of Education, Nanjing Medical University [NMUMT201804]
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Ochratoxin A (OTA) poses a serious threat to the health of human beings and animals. In this paper, a simple and sensitive electrochemiluminescence (ECL) aptasensor was constructed to detect OTA based on electrochemiluminescence resonance energy transfer (ECL-RET) and a nicking endonuclease-powered DNA walking machine. Originally, the signal of cadmium sulfide semiconductor quantum dots (CdS QDs) was quenched efficiently by Cy5. After the addition of OTA, the walker autonomously hybridized with Cy5-labeled DNA and released plenty of Cy5-DNA from the electrode surface with the help of a nicking endonuclease. As a result, the signal of CdS QDs recovered efficiently. As an artificial and popular signal amplification technique, the DNA walking machine greatly improved the sensitivity. Under optimal conditions, the aptasensor not only detected OTA in a linear range from 0.05 nM to 5 nM with a detection limit of 0.012 nM (S/N= 3), but also showed an excellent selectivity for OTA over other mycotoxins.
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