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Microbial Biosensors01:17

Microbial Biosensors

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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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Related Experiment Video

Updated: May 4, 2026

Foodborne Pathogen Screening Using Magneto-fluorescent Nanosensor: Rapid Detection of E. Coli O157:H7
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Magneto-electrochemical biosensing for pathogen detection using nuclease-responsive nanohybrids.

Gunes Kibar1,2, Murat Kavruk3,4, Frank J Hernandez5,6,7

  • 1Department of Materials Science and Engineering, Micro Nano Particles (MNP) Research Group, Adana Alparslan Turkes Science and Technology University, Adana, 01250, Türkiye.

Mikrochimica Acta
|May 2, 2026
PubMed
Summary

A novel green biosensing strategy efficiently detects Streptococcus pneumoniae using magnetic nanoparticles and nuclease activity. This sustainable platform offers rapid, label-free pathogen identification for improved diagnostics.

Keywords:
Streptococcus pneumoniaeElectrochemical biosensorEmulsion polymerizationGreen synthesisNuclease-based detectionPOSSSuperparamagnetic iron oxide nanoparticlesUV-polymerization

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Environmental Science

Background:

  • Developing sustainable and sensitive diagnostic platforms is crucial for pathogen identification.
  • Rapid detection of Streptococcus pneumoniae is essential for effective disease management.

Purpose of the Study:

  • To develop a green, magneto-electrochemical biosensing strategy for selective Streptococcus pneumoniae detection.
  • To create a sustainable and amplification-free biosensing platform for clinical diagnostics.

Main Methods:

  • Synthesized uniform organic-inorganic hybrid polyhedral oligomeric silsesquioxane (POSS) nanoparticles using eco-friendly UV-initiated emulsion polymerization.
  • Functionalized POSS nanoparticles with superparamagnetic iron oxide nanoparticles and polydopamine coating for probe immobilization.
  • Utilized nuclease activity for label-free electrochemical signal transduction upon S. pneumoniae detection.

Main Results:

  • Achieved selective detection of S. pneumoniae with a wide dynamic range (10^2-10^8 CFU mL⁻¹) and a low detection limit (10^2 CFU mL⁻¹).
  • Demonstrated high selectivity against non-target bacteria, confirming the enzymatic recognition mechanism.
  • Developed PDA@SPION/POSS nanohybrids with controlled size, structural integrity, and strong superparamagnetic behavior.

Conclusions:

  • Established a sustainable and amplification-free biosensing platform for rapid pathogen identification.
  • The magneto-electrochemical biosensor shows significant potential for clinical diagnostics.
  • The green synthesis approach aligns with environmental sustainability in diagnostics.