Functionalized monodisperse microbubble production: microfluidic method for fast, controlled, and automated removal...

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Functionalized monodisperse microbubbles enhance molecular ultrasound imaging and targeted drug delivery.
• Current lipid removal via centrifugation is inefficient, labor-intensive, and can compromise bubble monodispersity.
• Excess lipids hinder ligand binding and receptor accessibility.

Purpose of the Study:

• To develop and validate a novel, automated microfluidic method for removing excess lipids from microbubble suspensions.
• To demonstrate the efficiency and compatibility of the microfluidic washing technique with microbubble characteristics.
• To facilitate the automated production of high-quality functionalized microbubbles.

Main Methods:

• Microbubbles were injected into a microfluidic chamber and floated to the top wall.
• Lipid-free medium was pumped through the chamber to wash away excess lipids.
• Washed bubbles were resuspended and collected, with lipid concentration quantified.

Main Results:

• Achieved a 4-log reduction in excess lipid concentration.
• Demonstrated full automation of the washing process, completed within minutes.
• Confirmed no adverse effects on bubble size distribution, functionality, or acoustic response.

Conclusions:

• The microfluidic washing method offers a highly efficient and automated solution for preparing functionalized microbubbles.
• This technique overcomes limitations of centrifugation, paving the way for scalable, automated microbubble production.
• Enables improved applications in molecular ultrasound imaging and targeted drug delivery.