Lamb wave-based molecular diagnosis using DNA hydrogel formation by rolling circle amplification (RCA) process

Area of Science:

• Biotechnology
• Microfluidics
• Molecular Diagnostics

Background:

• Lab-on-a-chip devices are crucial for molecular diagnostics.
• Rapid and accurate infectious disease diagnosis is vital for public health.
• Microfluidic systems offer potential for point-of-care diagnostics.

Purpose of the Study:

• To characterize a Lamb wave-based microfluidic device for molecular diagnosis.
• To demonstrate the device's functionality in clinical applications.
• To optimize parameters for rapid gene amplification detection.

Main Methods:

• Characterization of a Lamb wave-based device with varying parameters (contact angle, viscosity, voltage, temperature).
• Utilizing rolling circle amplification (RCA) for isothermal gene amplification.
• Detection of viscosity changes via acoustic streaming velocity of suspended particles.

Main Results:

• Optimal RCA temperature of 30°C achieved at 17V Lamb wave generation.
• Gene amplification detected by decreased acoustic streaming velocity due to DNA hydrogel formation.
• Isothermal amplification detected within 30 minutes using 10μL sample, validated against commercial methods.

Conclusions:

• The Lamb wave-based device enables simple, low-cost molecular diagnosis.
• The device successfully performs isothermal amplification and detection.
• This technology is suitable for resource-limited clinical settings.