On-chip quantitative PCR using integrated real-time detection by capillary electrophoresis

Area of Science:

• Biotechnology
• Analytical Chemistry
• Molecular Diagnostics

Background:

• Quantitative PCR (qPCR) is a standard technique for infectious disease detection.
• Current qPCR methods can be time-consuming and require multiple steps.
• There is a need for faster, more integrated diagnostic platforms.

Purpose of the Study:

• To develop and validate a novel microfluidic chip integrating PCR and CE for rapid, real-time amplicon quantitation.
• To demonstrate the efficiency and multiplexing capability of the integrated on-chip qPCR system.
• To assess the performance of the on-chip qPCR method for infectious disease monitoring.

Main Methods:

• Integration of PCR and CE onto a single microfluidic chip.
• Design allowing overlapped execution of PCR and CE cycles.
• Demonstration using a 45-minute model assay with phiX174 bacteriophage.
• Validation of multiplexing capability with E. coli genomic DNA.

Main Results:

• Achieved rapid, real-time amplicon sampling, separation, and quantitation without probes.
• Demonstrated good sensitivity, reproducibility, and linearity (50 to 2 × 10^4 copies/25 μL).
• Successfully performed multiplexed detection of two targets on-chip.

Conclusions:

• The integrated on-chip qPCR-CE system offers a rapid and efficient method for molecular diagnostics.
• The novel chip design minimizes analysis time by overlapping PCR and CE processes.
• This platform shows significant potential for diverse infectious disease detection and monitoring applications.