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Manufacture of Concentrated, Lipid-based Oxygen Microbubble Emulsions by High Shear Homogenization and Serial Concentration
Published on: May 26, 2014
The influence of gas saturation on microbubble stability
Helen Mulvana1, Eleanor Stride, Meng-Xing Tang
1Imaging Sciences, Imperial College London, London, United Kingdom.
Ultrasound in Medicine & Biology
|April 6, 2012
Summary
Accurate acoustic characterization of microbubble contrast agents is crucial for reliable experimental results. Studies show that gas content significantly impacts microbubble stability, necessitating measurements in gas-saturated water for consistent data.
Area of Science:
- Acoustics and Biomedical Engineering
- Microbubble Contrast Agents
- Ultrasound Imaging and Therapy
Background:
- Accurate acoustic characterization is vital for microbubble contrast agent development and application.
- Current characterization methods often use "out-gassed" water, with variable final gas content.
- The influence of water gas content on microbubble stability is not consistently reported.
Purpose of the Study:
- To investigate the effect of dissolved gas content on microbubble contrast agent stability.
- To establish optimal conditions for reproducible acoustic characterization of microbubbles.
- To highlight the importance of water equilibration for accurate microbubble studies.
Main Methods:
- Laboratory-based bulk acoustic studies and high-speed optical photography of single microbubbles.
- Comparison of microbubble behavior in water with varying degrees of gas saturation.
- Controlled water preparation techniques to assess gas content influence.
Main Results:
- Dissolved gas content demonstrably influences the stability of microbubble contrast agents.
- Inconsistent water preparation leads to non-repeatable acoustic measurements.
- Microbubble stability is significantly enhanced in gas-saturated water conditions.
Conclusions:
- Acoustic characterization of microbubble contrast agents must be performed in equilibrated, gas-saturated water.
- Standardizing water preparation ensures accurate and repeatable measurements for research and development.
- This approach is essential for advancing microbubble applications in therapy and quantitative imaging.
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