Functionalization of microbubbles in a microfluidic chip for biosensing application.

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Biochemistry

Background:

• Microbubbles are versatile tools in biomedical imaging and therapy.
• Functionalizing microbubbles for targeted applications is challenging due to interface instability.
• Existing biosensors often lack rapid regeneration capabilities.

Purpose of the Study:

• To develop a simple and rapid protocol for microbubble functionalization.
• To integrate functionalized microbubbles into a novel microfluidic biosensor.
• To demonstrate the biosensor's capability for rapid analyte detection and surface regeneration.

Main Methods:

• Microbubbles functionalized with DSPE-PEG-Biotin via direct generation in a microfluidic chip.
• Organizing functionalized microbubbles in a chamber for bioanalyte capture.
• Utilizing fluorescent microscopy to assess functionalization and streptavidin capture.
• Demonstrating a complete functionalization-capture-measurement cycle under 10 minutes.

Main Results:

• Successful rapid functionalization of microbubbles directly during generation.
• Demonstrated capture of streptavidin as a model bioanalyte using functionalized microbubbles.
• Achieved a complete biosensing cycle (functionalization, capture, measurement, regeneration) in under 10 minutes.
• Verified functionalization and capture using fluorescent microscopy.

Conclusions:

• The developed microfluidic protocol enables efficient and rapid microbubble functionalization.
• The novel microbubble-based biosensor offers significant advantages in speed and regeneration.
• This technique holds promise for developing next-generation diagnostic and therapeutic tools.