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Visual Detection of Multiple Nucleic Acids in a Capillary Array
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A Finger-Actuated Sample-Dosing Capillary-Driven Microfluidic Device for Loop-Mediated Isothermal Amplification.

Xuan Le1,2, Jianxiong Chan1, James McMahon3

  • 1Department of Neuroscience, School of Translational Medicine, Monash University, Melbourne, VIC 3004, Australia.

Biosensors
|September 27, 2024
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Summary
This summary is machine-generated.

A new one-step colorimetric assay integrates sample lysis and Loop-mediated isothermal amplification (LAMP) for rapid COVID-19 detection. This user-friendly system, combined with a microfluidic device, offers a promising tool for point-of-care diagnostics.

Keywords:
LAMPPOCTcapillary-driven microfluidicfinger-actuated microfluidicloop-mediated isothermalpoint-of-care testing

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Area of Science:

  • Biotechnology
  • Molecular Diagnostics
  • Microfluidics

Background:

  • Loop-mediated isothermal amplification (LAMP) is crucial for rapid diagnostics.
  • Integrating sample processing and amplification in a disposable format remains a challenge.
  • Existing methods limit the practical application of LAMP at the point-of-care.

Purpose of the Study:

  • To develop an integrated, user-friendly system for SARS-CoV-2 detection.
  • To combine thermolysis and LAMP into a one-step colorimetric assay.
  • To create a microfluidic device for simplified sample handling and amplification.

Main Methods:

  • Developed a one-step colorimetric LAMP assay combining thermolysis and amplification.
  • Determined the limit of detection (LOD) in reaction tubes (500 copies/reaction at 65°C for 25 min).
  • Engineered a finger-actuated, capillary-driven microfluidic device with PVA coating for sample self-dosing and evaporation inhibition.

Main Results:

  • The integrated LAMP assay detected SARS-CoV-2 in nasopharyngeal swabs within 35 min at 65°C.
  • The microfluidic device successfully self-dosed samples and prevented evaporation.
  • Achieved a LOD of 500 copies per reaction in tube format.

Conclusions:

  • An integrated, one-step colorimetric LAMP assay and microfluidic device were successfully developed for COVID-19 detection.
  • This system simplifies sample introduction, lysis, amplification, and detection for point-of-care use.
  • The adaptable device shows potential for rapid detection of other RNA viruses.