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Related Concept Videos

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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Foodborne Pathogen Screening Using Magneto-fluorescent Nanosensor: Rapid Detection of E. Coli O157:H7
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Rapid detection of multiple foodborne pathogens using a nanoparticle-functionalized multi-junction biosensor.

Kara Yamada1, Won Choi1, Inae Lee2

  • 1Department of Human Nutrition, Food, and Animal Sciences, University of Hawaii, 1955 East-West Road, Honolulu, HI 96822, USA.

Biosensors & Bioelectronics
|September 25, 2015
PubMed
Summary

A novel single-walled carbon nanotube (SWCNT) biosensor enables rapid, multiplexed detection of foodborne pathogens like E. coli and S. aureus. This sensitive sensor shows promise for enhancing food safety through real-time pathogen identification.

Keywords:
DetectionMulti-functionMultiplexingPathogens

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Area of Science:

  • Biosensor Technology
  • Food Safety
  • Nanomaterials

Background:

  • Real-time identification of multiple bacterial pathogens in food is critical for public health and safety.
  • Existing detection methods often lack the desired simplicity, sensitivity, and multiplexing capabilities for industrial applications.
  • Developing a versatile biosensor for simultaneous pathogen detection remains a significant challenge.

Purpose of the Study:

  • To design and evaluate a single-walled carbon nanotube (SWCNT)-based multi-junction biosensor for the multiplexed detection of foodborne pathogens.
  • To assess the sensor's sensitivity, accuracy, and potential for real-time application in food safety.
  • To demonstrate the biosensor's capability in detecting specific bacterial strains, Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus).

Main Methods:

  • Fabrication of a 2x2 junction array using gold tungsten wires coated with polyethylenimine (PEI) and SWCNTs.
  • Functionalization of the array with streptavidin and biotinylated antibodies specific to E. coli and S. aureus.
  • Monitoring electric current (I) changes in response to bacterial binding and calculating signal changes (∆I) to reduce noise.

Main Results:

  • An inverse correlation between electrical current signals and bacterial concentrations (10^2-10^5 CFU/mL) was observed.
  • Linear regression analysis showed high correlation coefficients (R²=0.978 for E. coli, R²=0.992 for S. aureus).
  • The sensor successfully demonstrated multiplexed detection capabilities for E. coli and S. aureus in microbial cocktail samples.

Conclusions:

  • The developed SWCNT-based multi-junction biosensor offers a sensitive and simple platform for multiplexed pathogen detection.
  • This technology holds significant potential for real-time monitoring and enhancing food safety protocols.
  • Further development could lead to robust industrial applications for rapid foodborne pathogen identification.