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Related Experiment Video

Updated: Jun 20, 2026

Detection of Bacteria Using Fluorogenic DNAzymes
13:20

Detection of Bacteria Using Fluorogenic DNAzymes

Published on: May 28, 2012

Fluorescent homogeneous immunosensors for detecting pathogenic bacteria.

Ewa Heyduk1, Tomasz Heyduk

  • 1Edward A. Doisy Department of Biochemistry and Molecular Biology, St. Louis University Medical School, 1100 S. Grand Boulevard, St. Louis, MO 63104, USA.

Analytical Biochemistry
|September 29, 2009
PubMed
Summary

We created a quick antibody assay to detect bacteria using FRET. This sensor shows high specificity and sensitivity for identifying bacterial targets like E. coli.

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Detection of Bacteria Using Fluorogenic DNAzymes
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Foodborne Pathogen Screening Using Magneto-fluorescent Nanosensor: Rapid Detection of E. Coli O157:H7
09:04

Foodborne Pathogen Screening Using Magneto-fluorescent Nanosensor: Rapid Detection of E. Coli O157:H7

Published on: September 17, 2017

Area of Science:

  • Biotechnology
  • Immunology
  • Molecular Biology

Background:

  • Rapid and specific bacterial detection is crucial for public health and diagnostics.
  • Existing methods often lack speed, sensitivity, or specificity.

Purpose of the Study:

  • To develop a straightforward, antibody-based assay for rapid, homogeneous detection of bacteria.
  • To utilize fluorescence resonance energy transfer (FRET) for sensitive bacterial identification.

Main Methods:

  • Antibodies recognizing cell-surface epitopes were labeled with FRET-capable fluorochromes via complementary oligonucleotides.
  • Assay design promotes target-induced oligonucleotide annealing and FRET signal generation in the presence of bacteria.
  • Flexible linkers facilitate annealing even with modest antigen density.

Main Results:

  • The assay demonstrated rapid response times for bacterial detection.
  • High specificity was observed in distinguishing target bacteria.
  • The system showed high sensitivity in detecting target bacteria, including Escherichia coli O157:H7 and Salmonella Typhimurium.

Conclusions:

  • The developed antibody-based FRET assay provides a sensitive, specific, and rapid method for bacterial detection.
  • This homogeneous assay format simplifies sample processing and analysis.
  • The technology holds promise for various applications requiring quick identification of bacterial pathogens.