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A Syringe‐Based DNAzyme Sensor for Bacterial Detection
Author(s) -
Esmaeili Samani Sahar,
McConnell Erin M.,
Chang Dingran,
Rothenbroker Meghan,
Filipe Carlos D. M.,
Li Yingfu
Publication year - 2021
Publication title -
analysis and sensing
Language(s) - English
Resource type - Journals
ISSN - 2629-2742
DOI - 10.1002/anse.202100006
Subject(s) - agarose , deoxyribozyme , chemistry , nitrocellulose , chromatography , biosensor , syringe , rna , detection limit , escherichia coli , biochemistry , psychology , membrane , psychiatry , gene
We present a simple approach for bacterial detection that uses a bead‐bound RNA‐cleaving DNAzyme (RcD) and a syringe. The RcD used in this study, F‐EC1, is fluorescently labelled and can be specifically activated by a protein target released specifically by E. coli . Upon immobilization on agarose beads, the kinetic behaviour of F‐EC1 remains similar to that in solution. The F‐EC1‐agarose system was able to detect as few as 1,000 CFUs of E. coli and retained high recognition specificity. A syringe‐based biosensor was subsequently designed, where F‐EC1‐bearing agarose beads were loaded onto a filter‐containing column. Upon incubation with an E. coli containing reaction mixture, the cleavage fragment released from the beads was filtered onto a nitrocellulose paper to be detected. The sensor was used to achieve the detection of E. coli in water, milk, and apple juice. This method is cost‐effective, simple to use, and can be adapted to other ligand‐responsive RNA‐cleaving DNAzymes.