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Related Experiment Video

Updated: Mar 12, 2026

Foodborne Pathogen Screening Using Magneto-fluorescent Nanosensor: Rapid Detection of E. Coli O157:H7
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DNAzyme-integrated plasmonic nanosensor for bacterial sample-to-answer detection.

Fang Yu1, Yun Li1, Mingyu Li1

  • 1State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.

Biosensors & Bioelectronics
|November 8, 2016
PubMed
Summary
This summary is machine-generated.

A novel DNAzyme-Integrated Plasmonic Nanosensor (DIPNs) offers rapid, culture-free bacterial detection. This biosensor system accurately quantifies pathogens like E. coli at low concentrations in complex samples using naked eyes.

Keywords:
Bacterial pathogensDNAzymeLocalized surface plasmon resonancePlasmonic nanosensorSilver nanoplates

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Area of Science:

  • Biosensing
  • Nanotechnology
  • Molecular Diagnostics

Background:

  • Pathogenic bacteria present significant global health and economic risks.
  • Current culture-based bacterial detection methods are slow, labor-intensive, and costly.
  • There is a critical need for rapid, reliable, and user-friendly bacterial detection techniques.

Purpose of the Study:

  • To develop a novel, rapid, and culture-free biosensor for selective bacterial detection.
  • To integrate DNAzyme probes and plasmonic nanoparticles for enhanced sensitivity and specificity.
  • To demonstrate the efficacy of the developed sensor in complex biological matrices.

Main Methods:

  • Development of a DNAzyme-Integrated Plasmonic Nanosensor (DIPNs) platform.
  • Utilizing bacteria-specific RNA-cleaving DNAzyme probes for molecular recognition.
  • Employing enzyme-responsive plasmonic nanoparticles and localized surface plasmon resonance (LSPR) for signal readout.
  • Testing the system with Escherichia coli (E. coli) as a model analyte in various complex fluids.

Main Results:

  • The DIPNs system achieved selective detection of target bacteria.
  • Demonstrated rapid quantification of E. coli down to 50 bacteria per mL.
  • Successfully detected E. coli in complex samples like milk, serum, and juice.
  • Provided visual detection using naked eyes.

Conclusions:

  • The DIPNs platform offers a simple, inexpensive, and culture-free approach for bacterial detection.
  • This technology has potential for on-site, rapid detection of bacterial pathogens.
  • The developed biosensor shows promise for public health and food safety applications.