Chen W, Cui L, Song Y, Chen W, Su Y, Chang W, Xu W. Detection of
Listeria monocytogenes Using Luminol-Functionalized AuNF-Labeled Aptamer Recognition and Magnetic Separation.
ACS OMEGA 2021;
6:26338-26344. [PMID:
34660993 PMCID:
PMC8515604 DOI:
10.1021/acsomega.1c03527]
[Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Accepted: 08/18/2021] [Indexed: 06/13/2023]
Abstract
A capture probe was constructed using a combination of magnetic Fe3O4 nanoparticles and an aptamer directed towardListeria monocytogenes. A signal probe was prepared by combining luminol-functionalized flowerlike gold nanoparticles, obtained by combining luminol with chitosan bearing a complementary sequence of the aptamer. The complex consisting of the capture probe and signal probe could be removed through magnetic separation. Where the target was present within a sample, it competed with the complementary sequence for binding to the aptamer, causing a change of the chemiluminescent signal. The results indicated that a good linear relationship existed over the concentration range 1.0 × 101-1.0 × 105 CFU·mL-1. It was established that it was feasible to use this approach to detect L. monocytogenes at levels as low as 6 CFU·mL-1 in milk samples.
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