EWOD silicon biosensor for multiple nucleic acids analysis

Area of Science:

• Biotechnology
• Microfluidics
• Biosensor Technology

Background:

• Miniaturized biosensors are crucial for point-of-care diagnostics.
• Efficient liquid handling and parallel processing are key challenges in microfluidic devices.
• Electrowetting on dielectric (EW) actuation offers precise control over nano-volumes of liquid.

Purpose of the Study:

• To present a novel miniaturized biosensor with 96 silicon microchambers for high-throughput analysis.
• To demonstrate the effectiveness of electrowetting on dielectric (EW) actuation for liquid loading in microchambers.
• To validate the biosensor's performance for nucleic acid detection, specifically Hepatitis B virus (HBV).

Main Methods:

• Fabrication of a silicon-based biosensor with 96 individually addressable microchambers (200 nL each).
• Utilizing electrowetting on dielectric (EW) actuation for precise nano-volume liquid loading and modulation of interface properties.
• Integrating temperature sensors and heaters for controlled biochemical reactions.
• Performing real-time polymerase chain reaction (PCR) amplification for nucleic acid detection.

Main Results:

• Successful electroloading of nano-volumes of liquid into 96 microchambers with uniform distribution.
• Demonstrated effective surface chemistries for EW actuation and biocompatibility.
• Achieved highly uniform real-time PCR amplification for Hepatitis B virus (HBV) detection across all 96 wells.
• Confirmed the absence of cross-contamination between microchambers.

Conclusions:

• The developed EW-chip biosensor enables efficient, parallel nucleic acid analysis.
• The device shows significant potential for genetic point-of-care applications requiring high throughput.
• The system offers a robust platform for sensitive and specific molecular diagnostics.