Abstract
A fluorometric aptamer-based assay was developed for ultrasensitive and selective determination of the neonicotinoid insecticide acetamiprid. The method is based on the use of an aptamer against acetamiprid, multiple complementary strands (CSs), and gold nanoparticles (AuNPs). It is found that by using different CSs, the sensitivity and selectivity of the method is enhanced. On addition of acetamiprid to the aptamer, they will bind to each other and CS1-fluorescein (FAM)-labeled CS2 (as a dsDNA) will be formed. The FAM-labeled dsDNA does not bind to the AuNPs (as a strong quencher) and remains free in the environment, resulting in a strong fluorescence intensity. Without the introduction of acetamiprid, FAM-labeled CS2 binds to AuNPs directly and indirectly through hybridization with CS3 immobilized on the surface of the AuNPs. So, the fluorescence intensity of FAM-labeled CS2 is significantly quenched by AuNPs. The method can detect acetamiprid in the 5 to 50 nM concentration range with a 2.8 nM detection limit. The assay was applied to the determination of acetamiprid in spiked tap water where is gave recoveries that ranged between 95.4% and 94.4%.
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Financial support of this study was provided by Mashhad University of Medical Sciences.
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Bahreyni, A., Yazdian-Robati, R., Ramezani, M. et al. Fluorometric aptasensing of the neonicotinoid insecticide acetamiprid by using multiple complementary strands and gold nanoparticles. Microchim Acta 185, 272 (2018). https://doi.org/10.1007/s00604-018-2805-7
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DOI: https://doi.org/10.1007/s00604-018-2805-7