Ultrasound-Assisted Extraction (UAE) is an advanced technique that utilizes ultrasonic waves (20 kHz–2 MHz) to disrupt microalgae cell walls, significantly enhancing the extraction of valuable intracellular compounds. This method improves the efficiency and yield of key components such as lipids, proteins, and pigments, which are essential for applications in biofuels, nutraceuticals, and biotechnology. By generating cavitation bubbles in the solvent, ultrasonic waves create localized high-pressure and high-temperature conditions upon collapse, effectively breaking down cell walls and releasing trapped bioactive compounds.

One of the major challenges in microalgae processing — particularly for biofuel production — is breaking through the rigid cell walls to access soluble organics. While conventional methods like thermal or mechanical disruption are often costly and energy-intensive, UAE offers a more sustainable alternative. Compared to thermal techniques, ultrasound-assisted extraction reduces energy consumption, minimizes solvent use, and increases the yield of high-value compounds. This makes it a more efficient and environmentally friendly option for large-scale applications.

Beyond extraction, ultrasound technology can also be applied during microalgae cultivation to enhance cell growth rates, further improving biomass productivity. Its versatility and efficiency position UAE as a promising solution for overcoming barriers in algae-based industries, supporting both economic viability and sustainability. As research progresses, this method continues to gain traction for its ability to optimize resource recovery while reducing operational costs and environmental impact.

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