Electrokinetically synchronized polymerase chain reaction microchip fabricated in polycarbonate

Area of Science:

• Biotechnology
• Molecular Biology
• Microfluidics

Background:

• Conventional polymerase chain reaction (PCR) often requires bulky thermal cyclers.
• Continuous flow PCR offers potential for miniaturization and automation.
• Integrating electrokinetic control with continuous flow PCR presents unique challenges.

Purpose of the Study:

• To develop and demonstrate a novel electrokinetically driven synchronized continuous flow PCR (EDS-CF-PCR) system on a microchip.
• To optimize the microchannel design and temperature control for efficient DNA amplification.
• To evaluate the performance of the EDS-CF-PCR system compared to conventional methods.

Main Methods:

• Utilized a microfabricated polycarbonate chip with a single-loop channel for three distinct temperature zones (denaturation, annealing, extension).
• Employed electrokinetic injection for DNA template introduction and electrokinetic flow (EOF) for sample transport.
• Used Polybrene as a dynamic coating to control EOF and minimize dilution effects.
• Analyzed amplified products using microchip electrophoresis with laser-induced fluorescence (LIF) detection.

Main Results:

• Achieved DNA thermal amplification using the EDS-CF-PCR configuration on a microchip.
• Demonstrated successful synchronized continuous flow PCR with reduced voltage requirements due to the synchronized format.
• Observed amplicon generation leveling effects after approximately 25 cycles, similar to conventional block thermal cyclers.
• Confirmed the feasibility of electrokinetically driven synchronized PCR on a chip.

Conclusions:

• The developed EDS-CF-PCR system provides a viable on-chip method for DNA amplification.
• This approach offers advantages in terms of miniaturization, reduced voltage, and flexibility in cycle number.
• Represents a significant advancement in microfluidic PCR technology.