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Rapid PCR Thermocycling using Microscale Thermal Convection
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Bubble-free rapid microfluidic PCR.

Sang Hun Lee1, Jihwan Song1, Byungrae Cho2

  • 1Department of Bioengineering, University of California Berkeley, CA 94720, USA; Berkeley Sensor and Actuator Center, University of California Berkeley, CA 94720, USA.

Biosensors & Bioelectronics
|December 16, 2018
PubMed
Summary
This summary is machine-generated.

A novel bubble-free microfluidic polymerase chain reaction (PCR) device utilizes a polyethylene top layer to prevent bubble formation. This innovation enables ultrafast nucleic acid amplification and molecular diagnostics for point-of-care applications.

Keywords:
Bubble-free microfluidic PCRLung cancer biomarkerMolecular diagnosisNanoporous polymersPolymerase chain reaction

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Microfluidics

Background:

  • Microfluidic polymerase chain reaction (PCR) offers rapid nucleic acid amplification but is hindered by bubble generation and reagent evaporation.
  • These issues can lead to device malfunctions and compromise assay accuracy.

Purpose of the Study:

  • To develop a bubble-free microfluidic PCR device through controlled fluid transfer.
  • To inhibit bubble formation and reagent evaporation using a novel top layer design.

Main Methods:

  • Theoretical modeling and characterization of bubble behavior were employed.
  • An impermeable polyethylene (PE) top layer was utilized to inhibit vertical mass transport and thus bubble generation.
  • Nanoporous poly(dimethylsiloxane) (PDMS) and PE were used for self-powered sample loading and as a vertical barrier, respectively.

Main Results:

  • Simulations showed a 370% mass flow difference using an impermeable membrane as a vertical barrier.
  • Successful amplification of the cMET gene, a lung cancer biomarker, was achieved.
  • An ultrafast PCR test was completed in under 3 minutes under bubble-free conditions.

Conclusions:

  • The proposed bubble-free microfluidic PCR device overcomes key limitations of existing technologies.
  • This approach enables ultrafast molecular diagnosis, facilitating point-of-care testing and personalized medicine.
  • The technology represents a new paradigm for rapid nucleic acid-based diagnostics.