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Related Experiment Video

Updated: Sep 28, 2025

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Portable sample processing for molecular assays: application to Zika virus diagnostics.

Tanya Narahari1,2, Joshua Dahmer1, Alexandros Sklavounos1,2

  • 1Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada. aaron.wheeler@utoronto.ca.

Lab on a Chip
|March 31, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a portable digital microfluidic platform for automated Zika viral RNA extraction and amplification. The system achieves high sensitivity and specificity for Zika virus detection, enabling rapid diagnostics.

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Molecular Diagnostics

Background:

  • Zika virus poses a significant global health threat, necessitating rapid and portable diagnostic tools.
  • Current diagnostic methods often require complex laboratory infrastructure and trained personnel.
  • Integrated sample-to-answer solutions are crucial for point-of-care testing.

Purpose of the Study:

  • To develop and evaluate a digital microfluidic (DMF) platform for automated Zika viral RNA extraction and amplification.
  • To integrate the DMF platform with a sensitive detection assay for point-of-care Zika diagnostics.
  • To assess the platform's performance in laboratory and field settings.

Main Methods:

  • A reconfigurable digital microfluidic (DMF) platform with a closed, humidified environment and PID-controlled thermal cycling.
  • Automated RNA extraction using magnetic beads and integrated isothermal amplification of Zika RNA.
  • Coupling the DMF pipeline with a paper-based, colorimetric cell-free protein expression assay utilizing toehold switch-based sensors.
  • System powered by 12 V DC for portability and remote operation.

Main Results:

  • The DMF platform successfully automated RNA extraction, clean-up, and isothermal amplification.
  • Laboratory evaluation with spiked plasma samples showed 100% sensitivity and 75% specificity.
  • Field evaluation in Brazil detected infectious Zika viruses at 100 PFU mL-1 (RT-qPCR Ct 32.0) from a 5 μL sample.

Conclusions:

  • The developed DMF platform offers a portable, automated solution for Zika virus RNA detection.
  • The system demonstrates high sensitivity and specificity, suitable for miniaturized diagnostic testing.
  • This technology holds potential for rapid, point-of-care diagnostics in resource-limited settings.