A large volume, portable, real-time PCR reactor.

Area of Science:

• Biomedical Engineering
• Molecular Biology
• Analytical Chemistry

Background:

• Point-of-care diagnostics require portable, rapid, and accurate systems.
• Real-time polymerase chain reaction (PCR) is a crucial molecular diagnostic technique.
• Existing PCR systems can be bulky and require complex reagent preparation.

Purpose of the Study:

• To develop a portable, integrated system for real-time PCR at the point-of-care.
• To enable rapid nucleic acid amplification and detection using microfluidic devices.
• To facilitate the use of pre-stored, lyophilized reagents for simplified operation.

Main Methods:

• A portable thermal cycler with a double-sided heater and thermal waveguide was designed.
• A compact fluorescent detector was integrated with disposable microfluidic PCR chips (10–100 µL reaction volume).
• A modified feedforward, variable structural proportional-integral-derivative controller ensured precise temperature control (± 0.1 °C).

Main Results:

• The system achieved high temperature uniformity and fast ramping rates.
• Precise temperature control minimized overshoots (< 2 °C) and undershoots (< 5 °C).
• The system successfully tested viral and bacterial nucleic acid targets with pre-stored reagents.

Conclusions:

• The developed system offers a viable solution for point-of-care real-time PCR.
• The integrated design and microfluidic chips allow for rapid, accurate diagnostics.
• The ability to store reagents on-chip simplifies operation and expands potential applications.