Sustainable Polyphenol-Rich Extracts from Agricultural By-Products: Infectivity Inhibition Potential for Human Coronavirus 229E

What if the secret to fighting coronaviruses lies in your kitchen scraps and vineyard leftovers? A new study turns agricultural waste into a potential weapon against a common cold-causing coronavirus.

Forget expensive labs and exotic ingredients—sometimes the best science starts with what we throw away. Researchers took red onion peels, vineyard prunings, olive prunings, and chicory leaves, then used subcritical water extraction and resin adsorption to pull out their polyphenol-rich goodness. Three of the four extracts boasted high polyphenol content, over 200 milligrams per gram, showing these by-products are far from worthless.

Key Points

• Three of four extracts had >200 mg/g polyphenols.
• Red onion peel EC50: 10.1 µg/mL against HuCoV-229E.
• Chicory leaf EC50: 61.43 µg/mL; olive moderate; vineyard weak.