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Post-Formation Shrinkage and Stabilization of Microfluidic Bubbles in Lipid Solution
1Department of Biomedical Engineering, University of California Irvine , 3406 Engineering Hall, Irvine, California 92697, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|January 29, 2016
Summary
Microfluidic production of ultrasound contrast agents (UCAs) yields uniform microbubbles. Solution parameters like lipid ratio and viscosity significantly influence microbubble size and stability for enhanced medical imaging.
Area of Science:
- Biomedical Engineering
- Materials Science
- Acoustics
Background:
- Ultrasound contrast agents (UCAs) are vital for medical ultrasound imaging.
- Conventional UCAs have size variations, limiting resonance efficiency.
- Microfluidic flow-focusing offers a method for producing monodisperse UCAs.
Purpose of the Study:
- Investigate solution parameter effects on microfluidic UCA stabilization.
- Determine how lipid ratio, concentration, viscosity, and temperature impact bubble size and lifetime.
- Optimize microfluidic production for enhanced contrast enhancement.
Main Methods:
- Utilized microfluidic flow-focusing to generate UCAs.
- Systematically varied lipid ratios (DSPC/DSPE-PEG2000), concentrations, viscosities, and preparation temperatures.
- Analyzed bubble size and lifetime in relation to solution parameters.
Main Results:
- Bubble lifetime correlated with stable size, influenced by lipid-emulsifier ratio.
- Increased DSPE-PEG2000 fraction reduced bubble surface area.
- Lipid concentration above 2.1 mM increased surface area; optimal viscosity range identified.
- Room temperature preparation yielded smaller bubbles than higher temperatures.
Conclusions:
- Solution parameters critically control microfluidic UCA size and stability.
- Findings enable post-formation control for tailored UCA production.
- Optimized UCAs will improve ultrasound imaging contrast and resolution.
