Recovery of Bioactive Compounds from Juçara Palm (Euterpe edulis Mart.) Fruit Residues Using Deep Eutectic and Conventional Solvents

What if the leftovers of a tropical fruit could become a treasure trove of health-boosting compounds? Scientists have found a green way to unlock them.

Juçara palm fruits are prized, but their residues often end up as waste. Now, researchers have developed an eco-friendly method to extract valuable bioactive compounds from these leftovers. They used deep eutectic solvents (DES), a class of green solvents, combined with ultrasound assistance—a technique that uses sound waves to speed up extraction.

Seven DES formulations, based on choline chloride and various hydrogen bond donors like glycerol, glucose, and organic acids, were tested. Their performance was compared with conventional solvents such as water, ethanol, and ethanol/water mixtures. The extracts were then analyzed for phenolic compounds, anthocyanins, and antioxidant activity using spectrophotometric assays and ESI-MS/MS.

The results were striking: DES, especially the choline chloride-glycerol system, outperformed conventional solvents in recovering total phenolics, anthocyanins, and ABTS antioxidant activity. Acidic solvents favored anthocyanin stability, while ethanol- and glycerol-based systems yielded broader compound profiles. The study tracked around 40 phenolic compounds, including phenolic acids, flavanones, flavonoids, and anthocyanins.

This approach not only boosts the value of juçara residues but also supports sustainability in the species' production chain. It's a win-win for both industry and environment.

Key Points

• DES outperformed conventional solvents in extracting phenolics and anthocyanins.
• ChCl-glycerol system showed highest efficiency among tested DES.
• Acidic solvents favored anthocyanin stability; ~40 phenolics monitored.