Ultrasonic Emulsification Techniques in Food and Pharmaceutical Systems
Summary
Ultrasonic emulsification harnesses high-frequency sound waves to generate intense cavitation within liquid media, producing finely dispersed oil-in-water and water-in-oil droplets. When ultrasonic energy is applied, alternating compression and rarefaction cycles create microbubbles that grow and implode, generating localized high temperature and shear forces. These forces disrupt bulk phases into submicrometre droplets, enabling the preparation of stable emulsions with narrow size distributions. In food systems, such emulsions enhance the bioavailability of lipophilic nutrients, improve sensory properties and extend shelf-life. In pharmaceutical applications, ultrasonic emulsification facilitates the efficient encapsulation of active compounds into nanoemulsions and microcapsules for controlled release, enhanced solubility and targeted delivery. Modern developments encompass continuous-flow microreactors, container-free approaches and the design of eco-friendly, surfactant-free protocols. Scaling these techniques from laboratory to industrial volumes remains a focus, with emphasis on energy efficiency, process control and regulatory compliance. The evolving landscape of ultrasonic emulsification promises significant advancements in product quality, process sustainability and functional performance across global food and drug delivery sectors.
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Ultrasonic Emulsification Techniques in Food and Pharmaceutical Systems publication trend
The graph below shows the total number of articles in ultrasonic emulsification techniques in food and pharmaceutical systems across all publications each year (not limited to Nature Index journals).
Technical terms
Cavitation: Formation, growth and collapse of microbubbles under ultrasonic waves, releasing energy that generates shear forces for droplet break-up.
Microreactor: A miniaturised flow device with micro-scale channels designed to enhance energy density and process control in continuous emulsification.
Nanoemulsion: An emulsion with droplet diameters typically below 200 nm, offering optical transparency and improved stability for delivery applications.
Droplet size distribution (DSD): Statistical representation of droplet diameters within an emulsion, crucial for assessing uniformity and functional performance.
Zeta potential: Electrokinetic potential at the droplet surface, indicating colloidal stability by quantifying repulsive forces between charged particles.
References
- Emulsification mechanism in an ultrasonic microreactor: Influence of surface roughness and ultrasound frequency. Ultrasonics Sonochemistry (2023).
- Preparation of Surfactant-Free Nano Oil Particles in Water Using Ultrasonic System and the Mechanism of Emulsion Stability. Nanomaterials (2022).
- Understanding the Effect of the Oil-to-Surfactant Ratio on Eugenol Oil-in-Water Nanoemulsions Using Experimental and Molecular Dynamics Investigations. Industrial & Engineering Chemistry Research (2023).
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