Journal
FOOD CHEMISTRY
Volume 357, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.129769
Keywords
Hybridization chain reaction; Triplex DNA; Fluorescence resonance energy transfer; Chloramphenicol; Aptamer
Funding
- foundation and applied foundation research Joint-Youth Fund project of Guangdong province, China [2019A1515110648]
- project of Enhancing School with Innovation of Guangdong Ocean University [2020KZDZX1108, 230419054]
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An enzyme-free fluorescence resonance energy transfer (FRET) strategy based on triplex DNA and hybridization chain reaction amplification was established for sensitive detection of chloramphenicol (CAP) in milk. This method allows for accurate and rapid quantification of CAP, with a wide range of potential applications.
The use of chloramphenicol (CAP) in food had been strictly regulated or banned in many countries. Herein, an enzyme-free fluorescence resonance energy transfer (FRET) strategy was established for sensitive, rapid and specific detection of CAP in milk, which was based on triplex DNA and hybridization chain reaction amplification. CAP can specifically bind to the aptamer and release the trigger sequence, causing HCR to efficiently prime and forming triplex DNA, hence the FRET pairs (FAM and TAMRA) were close enough to cause fluorescent decreases. Consequently, CAP can be quantitatively detected by measuring the fluorescence reduction at 520 nm, and the reliability of the method was confirmed by enzyme-linked immunosorbent assay. The limit of CAP detection for 1.2 pg.mL- 1, and the average recoveries of milk samples were 97.5%-106%, and the relative standard deviation were 3.9%-5.3%. Thus, this method has a wide range of potential applications in CAP detection.
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