Researchers from The University of Queensland and the University of New South Wales have introduced a groundbreaking method to produce high-quality cold brew coffee in less than three minutes. The innovative ultrasonic technology significantly accelerates the cold brewing process, which traditionally takes 12 to 24 hours. The research, published in Ultrasonics Sonochemistry, showcases the potential for a new premium coffee experience that caters to the growing demand for efficient and flavorful cold brew.

The ultrasonic machine utilizes a patented sound transmission system to expedite the extraction of oils, flavors, and aromas from ground coffee. By connecting a transducer and a metallic horn to the brewing basket of an espresso machine, the system transforms the basket into a powerful ultrasonic reactor, inducing acoustic cavitation and enhancing mass transfer during brewing. This innovative approach reduces brewing time and maintains the smooth, less acidic, and less bitter qualities that cold brew enthusiasts appreciate.

Dr. Jaqueline Moura Nadolny of UQ emphasized the transformative impact of this technology, stating that it propels Australia from traditional to modern coffee-making methods, offering consumers a premium coffee experience comparable to traditional cold brew or espresso in just a few minutes. The potential applications of this technology extend to both home and commercial settings, enabling on-demand production of high-quality cold brew without the need for extensive refrigeration space.

Prof. Heather Smyth, a sensory scientist and flavor chemist at UQ, highlighted the potential for this innovation to elevate Australia’s international reputation as coffee connoisseurs. The research opens doors for further exploration of different types of beans and sensory dimensions of coffee, offering a new avenue for coffee shops and companies to differentiate their offerings.

The research’s findings, including the remarkable reduction in brewing time and the preservation of coffee properties, demonstrate the potential for this ultrasonic technology to revolutionize the coffee industry, offering a swift and premium cold brew experience that aligns with the evolving preferences of coffee enthusiasts.

References

• Chiu, S.-H., Naliyadhara, N., Bucknall, M. P., Thomas, D. S., Smyth, H. E., Nadolny, J. M., Kalantar-Zadeh, K., & Trujillo, F. J. (2024). Coffee brewing sonoreactor for reducing the time of cold brew from several hours to minutes while maintaining sensory attributes. Ultrasonics Sonochemistry, 106, 106885. https://doi.org/10.1016/j.ultsonch.2024.106885
• University of Queensland. (2024, May 7). Australian engineers develop an ultrasonic cold brew coffee machine. Tech Xplore; Tech Xplore. https://techxplore.com/news/2024-05-australian-ultrasonic-cold-brew-coffee.html