Abstract :
[en] Abstract: For sensitive and fast detection of Escherichia coli O157:H7, organic and inorganic hybrid
Au/Fe3+ nanoclusters (NCs) were synthesized for the first time using gold nanoparticles (GNPs),
bovine serum albumin, ferric chloride, phosphate-buffered saline, and antibodies. The Au/Fe3+ porous spongy NCs with large surface area showed excellent bio-specific capability for E. coli O157:H7.
GNPs in Au/Fe3+ NCs functioned as signal enhancers, significantly increasing the Raman signal via
the metathesis reaction product of Prussian blue and obviously improving the detection sensitivity.
We combined the novel Au/Fe3+ NCs with antibody-modified magnetic nanoparticles to create a
biosensor capable of sensitive detection of E. coli O157:H7, which showed a good linear response
(101 to 106 cfu/mL), high detection sensitivity (2 cfu/mL), and good recovery rate (93.60–97.50%) in
spiked food samples. These results make the biosensor well-suited for food safety monitoring. This
strategy achieves the goal of sensitive and quantitative detection of E. coli O157:H7.
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