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Microfluidic Capillaric Circuit for Rapid and Facile Bacteria Detection.

Ayokunle Oluwafemi Olanrewaju1,2, Andy Ng1,2, Philippe DeCorwin-Martin1,2

  • 1Biomedical Engineering Department, McGill University , 3775 rue University, Montreal, QC, H3A 2B4, Canada.

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Summary

A new microfluidic capillaric circuit (CC) enables rapid, automated detection of bacteria in urine. This point-of-care test offers a fast and sensitive method for diagnosing urinary tract infections (UTIs).

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Diagnostic Assays

Background:

  • Urinary tract infections (UTIs) are common bacterial infections requiring rapid diagnostics.
  • Current microfluidic diagnostic systems often suffer from complexity and slow operation.
  • Point-of-care testing for UTIs can significantly improve patient outcomes.

Purpose of the Study:

  • To develop a microfluidic capillaric circuit (CC) for rapid, automated bacterial detection in urine.
  • To optimize the CC for efficient bacteria capture and assay performance.
  • To evaluate the CC's potential for point-of-care urinary tract infection screening.

Main Methods:

  • 3D printing and replica molding of poly(dimethylsiloxane) microfluidic capillaric circuits.
  • Autonomous sequential liquid handling within the CC for sample processing.
  • On-the-spot packing of antibody-functionalized microbeads for bacterial capture.
  • Fluorescence-based detection of captured bacteria using streptavidin conjugate.

Main Results:

  • The microfluidic CC completed bacterial detection assays in under 7 minutes.
  • Achieved a limit of detection for E. coli in synthetic urine of 1.2 × 10^2 CFU/mL.
  • Demonstrated user-independent readout through manual or automated image analysis.

Conclusions:

  • The developed microfluidic CC is a peripheral-free, self-powered system for rapid bacterial detection.
  • This technology shows significant potential for point-of-care screening of urinary tract infections.
  • The system's speed and sensitivity surpass current clinical diagnostic criteria for UTIs.