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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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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor
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Published on: February 16, 2018

Dual-Signal Capillary Sensor Based on Viscosity Variation for Bacterial Endotoxin Detection.

Teng Lu1,2, Mei Zhao1,2, Wenli Wu1,2

  • 1Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Jinan 250014, China.

Analytical Chemistry
|May 22, 2026
PubMed
Summary
This summary is machine-generated.

A new dual-signal capillary sensor detects endotoxin by measuring viscosity changes. This rapid method offers reliable endotoxin detection in samples like injections, addressing a key public health concern.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Biosensing

Background:

  • Endotoxin from Gram-negative bacteria is a significant public health threat due to its stability and activity.
  • Current endotoxin detection methods require improvement in reliability, speed, and convenience.
  • A sensitive and practical detection strategy is crucial for various analytical applications.

Purpose of the Study:

  • To develop a novel distance-color dual-signal capillary sensor (DC-CapSensor) for endotoxin detection.
  • To utilize viscosity variations induced by endotoxin-Tachypleus Amebocyte Lysate (TAL) interaction for signal generation.
  • To establish a rapid, reliable, and convenient method for endotoxin quantification.

Main Methods:

  • Fabrication of a capillary sensor incorporating a membrane for distance signal generation.
  • Doping the viscous solution with horseradish peroxidase (HRP) for colorimetric signal readout.
  • Utilizing the HRP-catalyzed H2O2/TMB reaction, where viscosity modulates residual HRP concentration.
  • Employing the cascade reaction between TAL and endotoxin to induce specific viscosity changes.

Main Results:

  • The DC-CapSensor demonstrated dual-signal detection based on viscosity-induced variations.
  • Achieved low detection limits for endotoxin: 0.0407 EU/mL (distance) and 0.0614 EU/mL (colorimetric).
  • Successfully quantified endotoxin levels in commercial glucose and sodium chloride injections.

Conclusions:

  • The DC-CapSensor offers a reliable and sensitive method for endotoxin detection using viscosity changes.
  • The dual-signal approach enhances discrimination of different viscosities or concentrations.
  • This method is promising for practical endotoxin analysis, particularly in simple, low-viscosity matrices.