Effect of ultrasound intensification on the supercritical fluid extraction of phytochemicals from Agave salmiana bagasse

Can sound waves give a green extraction technique the ultimate boost? Researchers are testing ultrasound-assisted supercritical fluid extraction to unlock valuable compounds from leftover agave bagasse.

Agave bagasse is an agro-industrial by-product with hidden potential. Scientists aimed to recover valuable antioxidants and saponins by combining supercritical fluid extraction with ultrasound. However, physics can be picky. When the mass load was dense at 0.086 g/cm3, swelling and compaction inside the extraction cell blocked the ultrasound effect entirely.

When the load was halved to 0.043 g/cm3, the story changed dramatically. The intensification effect of ultrasound became significant, and its success depended heavily on the transducer geometry used in the system.

Using a multiplate transducer design truly delivered. The applied ultrasound significantly boosted antioxidant capacity from 12.18 to 20.91 μmol TE/g, and soared saponin recovery from 19.05 to 61.59 μg/g. While the total extracted amount remains low, this multiplate transducer design successfully intensifies the process, offering a promising alternative for treating other agro-industrial by-products.

Key Points

• Ultrasound-assisted supercritical fluid extraction of agave bagasse
• Mass load density dictates ultrasound success
• Multiplate transducer geometry boosts bioactive recovery