Journal
MICROCHIMICA ACTA
Volume 188, Issue 4, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-020-04684-y
Keywords
Saxitoxin; Graphene quantum dot; Aptamer; DNase I-catalyzed target recycling signal amplification; Fluorescence resonance energy transfer
Categories
Funding
- Technology R&D Program of Suzhou [SNG2018044]
- Natural Science Foundation of Shanghai [18ZR1409500]
- National Natural Science Foundation of China [31871881]
- Jiangsu Agriculture Science and Technology Innovation Fund (JASTIF) [CX(18)2025]
- S&T Support Program of Jiangsu Province [BE2017623]
- National First-class Discipline Program of Food Science and Technology [JUFSTR20180303]
- Distinguished Professor Program of Jiangsu Province
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A highly sensitive and rapid aptamer assay was developed for detecting the major marine toxin, saxitoxin (STX), in shellfish. The method showed a wide detection range, low detection limit, high specificity, good recovery, and repeatability, making it suitable for successful detection of STX in seafood products.
Saxitoxin (STX) is a major marine toxin from shellfish, and it is responsible for paralytic shellfish poisoning (PSP). In this study, a highly sensitive and rapid aptamer assay was developed for STX detection by combining fluorescence resonance energy transfer (FRET) and nuclease-assisted target recycling signal amplification. The aptamer STX-41 conjugated with graphene quantum dots (GQDs) was adsorbed on magnetic reduced graphene oxide (MRGO) to establish a fluorescence quenching system. Then, the binding between STX and aptamer induced the desorption of GQD-aptamer from MRGO and the restoring of fluorescence for the fluorescent determination of STX. The digestion of the target bound aptamer by DNase I could release the target for recycling thus achieving signal amplification. Under the optimized conditions, the aptamer assay showed a wide detection range (0.1-100 ng center dot mL(-1)), low detection limit (LOD of 0.035 ng center dot mL(-1)), high specificity, good recovery (86.75-94.08% in STX-spiked clam samples) and repeatability (RSD of 4.27-7.34%). Combined with fluorescent detection technology, signal amplification technology, and magnetic separation technology, the proposed method can be used to detect STX in seafood products successfully.
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