A disposable, continuous-flow polymerase chain reaction device: design, fabrication and evaluation

Area of Science:

• Biotechnology
• Molecular Biology
• Microfluidics

Background:

• Polymerase Chain Reaction (PCR) is a cornerstone technique for DNA amplification.
• Traditional PCR methods often involve lengthy reaction times and macro-scale equipment.
• Microfluidic devices offer advantages in reduced sample volume, faster reaction times, and lower costs.

Purpose of the Study:

• To develop a disposable, polymer-based microfluidic device for continuous flow Polymerase Chain Reaction (PCR).
• To achieve rapid DNA amplification in under 13 minutes using a novel thermal cycling approach.
• To demonstrate the efficacy of the device for real-time PCR applications.

Main Methods:

• Design and fabrication of a disposable polycarbonate (PC) microfluidic device with a serpentine channel.
• Utilizing continuous flow through a precisely controlled temperature gradient for thermal cycling.
• Employing simulations to determine the optimal temperature gradient and experimental validation.
• Demonstrating amplification of foot-and-mouth disease virus (FMDV) cDNA.

Main Results:

• Successful real-time, continuous flow PCR was achieved in a disposable polymer device.
• The device completed DNA amplification in less than 13 minutes.
• Experimental validation confirmed the temperature gradient determined through simulations.
• Effective amplification of FMDV cDNA was demonstrated.

Conclusions:

• Disposable polymer microfluidic devices are viable for rapid, continuous flow PCR.
• This technology offers significant improvements in speed and cost-effectiveness for DNA amplification.
• The developed device shows promise for point-of-care diagnostics and high-throughput screening.