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Updated: May 17, 2025
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A Droplet-Based Microfluidic Approach and Microsphere-PCR Amplification for Single-Stranded DNA Amplicons
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A systematic implementation of padlock probing-based rolling circle amplification in an integrated microfluidic
Catarina R F Caneira1, Rafaela R Rosa1, Virginia Chu1
1Instituto de Engenharia de Sistemas e Computadores - Microsistemas e Nanotecnologias (INESC MN), Lisbon, Portugal.
Analytica Chimica Acta
|April 5, 2025
Summary
This study developed a sensitive microfluidic pathogen detection assay using padlock probing-based rolling circle amplification (PLP-RCA) on agarose microbeads. The optimized system integrates on-chip fluorescence detection for portable, clinical diagnostics.
Area of Science:
- Biotechnology
- Microfluidics
- Molecular Diagnostics
Background:
- Point-of-care pathogen detection is vital for identifying viruses and antibiotic-resistant bacteria.
- Microfluidic devices offer portability but often struggle with sensitivity.
- On-chip isothermal amplification, like padlock probing-based rolling circle amplification (PLP-RCA), can improve sensitivity and specificity.
Purpose of the Study:
- To systematically evaluate target capture strategies for on-chip PLP-RCA assays.
- To integrate microfluidics with solid-phase capture and fluorescence detection for pathogen detection.
- To develop a sensitive and portable diagnostic platform for clinical applications.
Main Methods:
- Developed a microfluidic assay utilizing porous agarose microbeads for solid-phase capture.
- Compared and optimized single- and double-stranded DNA target capture strategies.
- Integrated an amorphous-hydrogenated silicon (a-Si:H) photodiode and interference filter for on-chip fluorescence detection.
Main Results:
- Identified an optimal capture strategy using primers bound to beads for double-stranded Staphylococcus aureus genomic DNA.
- Successfully demonstrated a fully functional on-chip PLP-RCA assay.
- Achieved sensitive detection of amplicons via integrated fluorescence acquisition.
Conclusions:
- The study successfully integrated microfluidics, solid-phase capture, and fluorescence detection for on-chip PLP-RCA.
- The developed platform shows significant potential for sensitive, portable pathogen detection.
- This approach is well-suited for meeting clinical diagnostic demands.
