Ultrafast, low-power, PCB manufacturable, continuous-flow microdevice for DNA amplification

Area of Science:

• Biotechnology
• Microfluidics
• Molecular Biology

Background:

• Conventional Polymerase Chain Reaction (PCR) often requires lengthy amplification times and significant power.
• Microfluidic devices offer potential for faster and more efficient PCR but face challenges in fabrication and robustness.

Purpose of the Study:

• To design and fabricate a continuous-flow microchip PCR (μPCR) device with rapid amplification and low power consumption.
• To develop a robust fabrication method compatible with mass production in the PCB industry.
• To validate the device's performance for amplifying clinically relevant DNA targets.

Main Methods:

• Utilized 4-layer printed circuit board (PCB) substrates with embedded copper micro-resistive heaters.
• Developed a novel bonding method to ensure microchannel robustness under high pressure drops (12 bars).
• Validated the μPCR chip by amplifying DNA fragments from the BRCA1 gene and pBR322 plasmid.

Main Results:

• Achieved successful DNA amplification in total reaction times as short as 2 minutes.
• Demonstrated low power consumption of 2.7 W.
• Validated the device's reliability and suitability for amplifying different DNA targets and copy numbers.
• Performed novel numerical calculations of DNA residence time distributions to optimize PCR protocols.

Conclusions:

• The developed μPCR device is one of the fastest and lowest power-consuming systems available.
• The PCB-compatible fabrication allows for mass production and implementation in low-resource settings.
• Numerical analysis provides critical insights into optimizing on-chip PCR protocols for maximum efficiency.