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Related Concept Videos

Microbial Biosensors01:17

Microbial Biosensors

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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Optical Detection of E. coli Bacteria by Mesoporous Silicon Biosensors
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Advanced nanostructured biosensors enabled by rational surface engineering for bacterial detection.

Nitish Kumar1, Lester U Vinzons1, Wei-Yau Shia2

  • 1Graduate Institute of Biomedical Engineering, National Chung Hsing University, Taichung, 402202, Taiwan, ROC.

Biosensors & Bioelectronics
|October 22, 2025
PubMed
Summary
This summary is machine-generated.

This study developed a novel nanostructured biosensor for rapid, sensitive bacterial detection. The boronic acid-functionalized nanowire sensor accurately identifies Gram-negative bacteria in food samples within minutes.

Keywords:
Advanced nanostructured biosensorBacterial detectionGram-strain discriminationInterfacial interactionXDLVO theory

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Area of Science:

  • Nanotechnology
  • Biosensing
  • Electrochemistry

Background:

  • Rapid and specific bacterial pathogen detection is crucial for public health and food safety.
  • Existing methods often lack speed, sensitivity, or specificity.
  • Nanostructured biosensors offer potential for improved diagnostic capabilities.

Purpose of the Study:

  • To engineer a nanostructured biosensor for electrochemical impedance spectroscopy (EIS)-based bacterial detection.
  • To enhance bacterial adhesion and signal transduction using boronic acid functionalization.
  • To validate the biosensor's performance in real-world samples.

Main Methods:

  • Fabrication of boronic acid (BA)-functionalized indium tin oxide vertical nanowires (ITO-VNWs).
  • Optimization of nanowire geometry via KOH etching.
  • Surface chemistry modification with BA for cis-diol binding.
  • Electrochemical impedance spectroscopy (EIS) for bacterial detection.
  • Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) analysis for interaction modeling.

Main Results:

  • Enhanced bacterial adhesion and electrical signal transduction were achieved.
  • The biosensor demonstrated a broad dynamic detection range (10^1-10^7 CFU mL^-1) and rapid response (9 min).
  • High specificity for Gram-negative bacteria (e.g., Escherichia coli) over Gram-positive bacteria (e.g., Staphylococcus aureus) was observed.
  • Accurate detection in spiked milk and juice samples was confirmed.

Conclusions:

  • Nanoscale surface engineering and XDLVO modeling effectively optimize biosensor performance.
  • The developed BA-ITO-VNW biosensor provides a versatile strategy for real-time, label-free discrimination of Gram-negative bacteria.
  • Integration with a portable EIS chip enables miniaturized, field-deployable diagnostics for public health and food safety.