Response Surface Optimization of Inulin and Polyphenol Extraction from Artichoke (Cynara scolymus (L.)) Solid Wastes

Did you know that up to 70% of an artichoke is thrown away? Those scraps are a hidden treasure trove of health-boosting compounds—and scientists just found a greener way to unlock them.

Artichoke processing leaves behind a mountain of waste—60 to 70% of the raw material, to be exact. But this so-called waste is packed with inulin and polyphenols, bioactive compounds that could become functional food ingredients or nutraceuticals. The challenge? Extracting them efficiently without harming the planet.

Researchers turned to response surface methodology to optimize the process. Using plain water as the solvent, they found that heating at 89°C for 139 minutes extracted 80% of the inulin, 60% of the total phenolic content, and 56% of the antioxidant activity. Not bad for a green solvent.

When they switched to water-ethanol mixtures, the results shifted. At 22.4% ethanol, 81°C, and 217 minutes, they achieved 90% polyphenol yield and 38% antioxidant activity, but only 58% inulin. The ethanol boosted polyphenol extraction but sacrificed inulin recovery.

So which wins? The authors recommend water. It extracts slightly less polyphenols, but the amounts are still substantial—and it avoids organic solvents entirely. For a sustainable, scalable process, water is the smarter choice.

Key Points

• Artichoke waste is 60-70% of raw material.
• Water at 89°C extracts 80% inulin, 60% polyphenols.
• Water-ethanol boosts polyphenols but lowers inulin yield.