UV-Assisted Hyperbranched Poly(β-amino ester) Modification of a Silica Membrane for Two-Step Microfluidic DNA...

Area of Science:

• Biomedical Engineering
• Molecular Diagnostics
• Materials Science

Background:

• Nucleic acid extraction is vital for point-of-care (POC) diagnostics but faces challenges like manual steps and inhibitors.
• Current methods hinder routine viral load monitoring, especially for transplant patients.

Purpose of the Study:

• To develop a microfluidic system for rapid, instrument-free DNA extraction from blood.
• To enable efficient cytomegalovirus (CMV) detection without amplification inhibitors for POC applications.

Main Methods:

• Synthesized and screened UV-assisted hyperbranched poly(β-amino ester) (HPAE)-modified silica membranes.
• Integrated HPAE-coated membranes into a microfluidic chip with PMMA substrates.
• Evaluated DNA extraction efficiency and lower limit of viral load for CMV detection using real-time LAMP.

Main Results:

• Achieved 94% DNA extraction efficiency from blood in 20 minutes.
• Demonstrated a lower limit viral load detection of 300 IU/mL.
• Obtained comparable fluorescent signal intensity to commercial extraction methods.

Conclusions:

• The developed microfluidic system offers rapid, instrument-free DNA extraction.
• It effectively minimizes amplification inhibitors, suitable for routine viral load monitoring.
• The system is easily integrated with nucleic acid amplification for POC CMV detection.