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Related Concept Videos

Cholera01:25

Cholera

Cholera is an acute gastrointestinal disease caused by the Gram-negative bacterium Vibrio cholerae. It is transmitted primarily via the fecal-oral route through the ingestion of contaminated water or food.Vibrio cholerae is a motile, Gram-negative bacterium of the family Vibrionaceae, primarily associated with waterborne outbreaks in areas with inadequate sanitation. Although over 200 serogroups of V. cholerae exist, only O1 and O139 are responsible for epidemic cholera. The O1 serogroup,...
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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Amplification of Escherichia coli in a Continuous-Flow-PCR Microfluidic Chip and Its Detection with a Capillary Electrophoresis System
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Cholera toxin subunit B detection in microfluidic devices.

Natinan Bunyakul1, Katie A Edwards, Chamras Promptmas

  • 1Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY, 14853, USA.

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|September 9, 2008
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This study developed novel microfluidic biosensors for detecting cholera toxin subunit B (CTB). The electrochemical biosensor demonstrated superior sensitivity and reliability compared to the fluorescence version.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Cholera toxin subunit B (CTB) detection is crucial for diagnosing cholera.
  • Microfluidic devices offer advantages for rapid and sensitive biosensing.
  • Developing robust biosensors with high sensitivity and reliability is essential.

Purpose of the Study:

  • To develop and compare fluorescence and electrochemical microfluidic biosensors for CTB detection.
  • To evaluate the performance characteristics, including limit of detection (LoD), of both biosensor formats.
  • To assess the flexibility and reliability of the developed biosensing platforms.

Main Methods:

  • Fabrication of polydimethylsiloxane (PDMS) microfluidic devices using soft lithography.
  • Integration of interdigitated ultramicroelectrode arrays (IDUA) for electrochemical detection.
  • Immobilization of CTB-specific antibodies onto superparamagnetic beads and incorporation of ganglioside GM(1) into liposomes.
  • Encapsulation of fluorescent (sulforhodamine B) and electroactive (potassium hexacyanoferrate) markers within liposomes for detection.

Main Results:

  • Both fluorescence and electrochemical microfluidic biosensors were successfully developed for CTB detection.
  • The electrochemical format achieved a lower limit of detection (LoD) of 1.0 ng mL(-1) compared to 6.6 ng mL(-1) for the fluorescence format.
  • The electrochemical assay exhibited greater flexibility and reliability in signal recording.

Conclusions:

  • The developed electrochemical microfluidic biosensor offers a sensitive, reliable, and flexible platform for CTB detection.
  • This technology holds promise for improved cholera diagnostics.
  • The modular design allows for easy adaptation to different detection markers and analytes.