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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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Complex Liquid Crystal Emulsions for Biosensing.

Alberto Concellón1, Darryl Fong1, Timothy M Swager1

  • 1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

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|June 10, 2021
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Summary
This summary is machine-generated.

This study introduces a novel optical biosensor using liquid crystal (LC) emulsions for rapid pathogen detection. The biosensor effectively identifies foodborne bacteria like Salmonella by monitoring changes in liquid crystal properties.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Analytical Chemistry

Background:

  • Development of sensitive and rapid biosensing technologies is crucial for food safety.
  • Optical detection methods offer advantages in terms of speed and non-invasiveness.
  • Liquid crystal (LC) materials exhibit unique optical properties that can be modulated by external stimuli.

Purpose of the Study:

  • To develop a highly responsive optical biosensor utilizing dynamic complex liquid crystal emulsions.
  • To establish a new sensing paradigm based on the selective reflection of chiral nematic (N*) liquid crystals.
  • To demonstrate the detection of foodborne pathogens using this novel biosensing platform.

Main Methods:

  • Preparation of immiscible chiral nematic (N*) liquid crystals and fluorocarbon oil emulsions.
  • Utilizing boronic acid polymeric surfactants with binaphthyl units for biomolecular recognition.
  • Monitoring changes in N* selective reflection triggered by antibody-antigen interactions at the LC interface.

Main Results:

  • The biosensor demonstrated high responsiveness to biomolecular recognition events.
  • Changes in the LC/water interfacial activity were successfully correlated with the presence of IgG antibodies.
  • The system effectively detected the foodborne pathogen Salmonella via interface-triggered reflection changes.

Conclusions:

  • Dynamic complex LC emulsions provide a viable platform for developing advanced optical biosensors.
  • The proposed sensing strategy enables effective optical read-out for pathogen detection.
  • This approach holds promise for rapid and sensitive detection of foodborne pathogens in complex samples.