High-transition-temperature paraffin integration in IFAST device for efficient and robust nucleic acid extraction and...

Area of Science:

• Biotechnology
• Microfluidics
• Molecular Diagnostics

Background:

• Infectious diseases pose significant challenges in resource-limited areas due to limited healthcare access.
• Nucleic acid testing is crucial for pathogen diagnosis but traditional methods are resource-intensive for point-of-care use.
• Current microfluidic nucleic acid extraction systems (IFAST) using paramagnetic particles (PMPs) suffer from barrier instability.

Purpose of the Study:

• To develop a stable and efficient microfluidic device for nucleic acid extraction.
• To overcome the barrier stability issues in immiscible phase filtration-assisted systems (IFAST).
• To enable rapid, on-site pathogen detection in resource-limited settings.

Main Methods:

• Development of a high-transition-temperature (HTT) paraffin-embedded IFAST device.
• Utilizing HTT paraffin to maintain barrier integrity during thermal lysis and RNA extraction.
• Integration of RNA extraction with colorimetric reverse transcription loop-mediated isothermal amplification (RT-LAMP) detection.

Main Results:

• The HTT paraffin-embedded IFAST device demonstrated improved barrier stability at temperatures up to 75°C.
• The system successfully reduced carryover during magnetic particle transfer.
• Accurate detection of as little as 1 copy/μL of SARS-CoV-2 viral genome was achieved without false positives.

Conclusions:

• The developed HTT paraffin IFAST device enhances operational stability and extraction efficiency for nucleic acid testing.
• This technology facilitates rapid, on-site diagnostics, improving disease management in resource-limited regions.
• The integrated system advances accessible and effective infectious disease diagnostics at the point-of-care.