Polyphenol extraction from Lacrima di Morro d'Alba grape pomace and Ascolana Tenera olive leaves as an effective recovery of agricultural side-streams

What if the waste from your wine and olive oil could become a treasure trove of health-boosting compounds? This study turns agricultural leftovers into a source of polyphenols and antioxidants—without harming the planet.

Imagine a world where grape skins and olive leaves, once discarded, become key players in a circular bioeconomy. That's the promise of this research, which dives into green extraction methods to recover bioactive compounds from two Italian agricultural side-streams: Lacrima di Morro d'Alba grape pomace and Ascolana Tenera olive leaves.

Using a toolbox of techniques—from classic liquid-solid extraction to high-tech ultrasound, microwave, and supercritical fluid methods—the scientists compared how well each could pull out polyphenols, including flavonoids, anthocyanins, and phenolic acids. The results? Ultrasound-assisted extraction (UAE) emerged as the star for grape pomace, optimally recovering flavan-3-ols, phenolic acids, and the anthocyanin malvidin-3-galactoside.

For olive leaves, however, the story was different: no single method showed clear selectivity for recovering oleuropein, hydroxytyrosol, or tyrosol. This nuance underscores that each waste stream demands a tailored approach.

Ultimately, the study champions agri-food waste as a renewable resource, turning a liability into an asset. It's a small step for science, a giant leap for sustainability—proving that what we throw away might just hold the key to a greener future.

Key Points

• UAE optimally recovers flavan-3-ols, phenolic acids, and malvidin-3-galactoside from grape pomace.
• No clear selectivity found for olive leaf compounds like oleuropein and hydroxytyrosol.
• Green extraction transforms agri-food waste into renewable resources for a circular bioeconomy.