Abstract
A host–guest colorimetric strategy is described for the detection of Listeria monocytogenes (L. monocytogenes). The optical probes were self-assembled based on the supramolecular interactions between the carbonyl groups of cucurbit[7]uril portals and gold nanoparticles (CB[7]-AuNPs). Aptamer and urease modified magnetic nanoparticles were used to specifically recognize and binding to L. monocytogenes, simultaneously hydrolyzing urea to produce ammonium ion (NH4+) that can reverse CB[7] induced AuNPs aggregation. In the presence of L. monocytogenes, the above-mentioned magnetic conjugates preferentially bind to the bacterial surface, which results in blocking the catalytic active sites, thus inhibiting the production of ammonium ions. The normalized absorbance ratio of A700 nm/A525 nm was proportional to the L. monocytogenes concentration ranging from 10 to 106 cfu·mL−1, and the visual determination can be done down to 10 cfu·mL−1. For spiked food samples analyzed without pre-enrichment, recoveries of 98.4% to 99.3% were achieved could be verified and RSD were less than 10%. This work may offer a broad prospect for sensitive and specific determination of pathogens.
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The authors thank the financial support from the National Natural Science Foundation of China (Grant No. 82073603 and 82073557), Jilin Province Science, and Technology Development Plan Item (Grant No. 20200403035SF).
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Wang, X., Liu, Y., Shi, X. et al. Colorimetric determination of Listeria monocytogenes using aptamer and urease dual-labeled magnetic nanoparticles and cucurbit[7]uril-mediated supramolecular assembly of gold nanoparticle. Microchim Acta 189, 41 (2022). https://doi.org/10.1007/s00604-021-05130-3
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DOI: https://doi.org/10.1007/s00604-021-05130-3