Planar chip device for PCR and hybridization with surface acoustic wave pump

Area of Science:

• Biotechnology
• Microfluidics
• Molecular Diagnostics

Background:

• Traditional microfluidic devices often rely on complex channel networks.
• Efficient manipulation and analysis of small fluid volumes are crucial for advanced diagnostics.

Purpose of the Study:

• To develop a microfluidic device utilizing surface acoustic waves (SAW) on a planar surface for integrated biological analyses.
• To demonstrate the chip's capability for sensitive and rapid DNA amplification (PCR) and hybridization.

Main Methods:

• A microfluidic device was fabricated on a lithium niobate (LiNbO3) piezoelectric substrate.
• Surface acoustic waves (SAW) were employed for droplet manipulation and mixing.
• Integrated thin-film resistance heaters enabled temperature cycling for PCR and hybridization.
• Mineral oil encapsulation prevented reagent evaporation during high-temperature processes.

Main Results:

• The chip successfully performed highly sensitive, fast, and specific polymerase chain reaction (PCR) with volumes as low as 200 nl.
• Online monitoring of DNA concentration during PCR achieved a sensitivity of 0.1 ng.
• The device detected a single nucleotide polymorphism (SNP) associated with Leiden Factor V syndrome in human blood samples.

Conclusions:

• The developed planar microfluidic chip offers an efficient platform for integrated DNA amplification and analysis.
• SAW technology combined with microheaters provides precise control over fluid manipulation and thermal cycling.
• This approach enables sensitive genetic analysis from minimal sample volumes, with potential applications in disease diagnostics.