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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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Wide-field Fluorescent Microscopy and Fluorescent Imaging Flow Cytometry on a Cell-phone
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MicroLED biosensor with colloidal quantum dots and smartphone detection.

Natalie Bruce1,2, Francesca Farrell1, Enyuan Xie1

  • 1Institute of Photonics, Department of Physics, SUPA, University of Strathclyde, Glasgow, UK.

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Summary
This summary is machine-generated.

This study introduces a smartphone-based fluorescence sensor for multiplexed bioassays. It uses quantum dots and microLEDs for sensitive detection, achieving nanomolar concentrations.

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Area of Science:

  • Biophotonics
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Developing portable and sensitive bioanalytical tools is crucial for point-of-care diagnostics.
  • Existing fluorescence detection methods often require bulky and expensive equipment.
  • Smartphone integration offers a promising platform for accessible bioassay detection.

Purpose of the Study:

  • To develop a spatially multiplexed fluorescence sensor using smartphone detection.
  • To leverage total internal reflection fluorescence (TIRF) principles for enhanced sensitivity.
  • To demonstrate the sensor's capability for detecting low concentrations of biomolecules.

Main Methods:

  • Utilized bioconjugated quantum dots as fluorescent tags.
  • Employed a blue-emitting gallium nitride micro-light-emitting diode (µLED) array for excitation.
  • Integrated the µLED array with a glass slide waveguide for TIRF.
  • Analyzed fluorescence signals using the red, green, and blue channels of a smartphone camera.
  • Validated the system using a biotin-streptavidin assay on a functionalized glass slide.

Main Results:

  • Achieved spatially multiplexed fluorescence measurements.
  • Successfully separated excitation light from fluorescence signals using smartphone RGB channels.
  • Demonstrated detection of streptavidin conjugated quantum dots down to 8 nM concentration.
  • Confirmed the feasibility of smartphone-based fluorescence detection for bioassays.

Conclusions:

  • The developed smartphone-based fluorescence sensor enables sensitive and spatially multiplexed bioassays.
  • The integration of µLEDs and TIRF principles with smartphone detection offers a cost-effective and portable analytical solution.
  • This technology has potential applications in various fields, including diagnostics and environmental monitoring.