Application of pectinases for recovery of grape seeds phenolics

Grape marc seeds are a hidden treasure trove of polyphenols—and now scientists have found a greener, enzyme-powered way to unlock them, saving energy and money.

Every year, winemaking leaves behind tons of grape marc—the skins, stems, and seeds. But those seeds are no waste: they are packed with polyphenols, natural compounds prized for their antioxidant power. The challenge? Extracting them efficiently without harsh chemicals or heavy energy use.

Enter a new green method: enzyme-assisted extraction. Instead of relying on toxic solvents, this approach uses commercial oenological enzymes—specifically pectinases—to gently break down the seed cell walls and release the phenolic treasures. The process is not only eco-friendly but also optimized to squeeze out the maximum yield.

Using response surface methodology, researchers fine-tuned the conditions. The winning recipe? The enzyme preparation Lallzyme EX-V, at 48°C, for 2 hours and 43 minutes, with a pH of 3.5 and an enzyme dose of 20 mg per gram of seeds. These precise settings deliver a simple, fast, and selective recovery of monomeric and dimeric phenols.

The result is a method that is cheaper, cleaner, and kinder to the planet—and the extracts it produces are ready for use in pharmaceuticals, food, and cosmetics. So next time you sip a glass of wine, remember: the seeds are just getting started.

Key Points

• Enzyme-assisted extraction uses pectinases to recover polyphenols from grape seeds.
• Optimal conditions: Lallzyme EX-V, 48°C, pH 3.5, 20 mg/g, 2h43m.
• Green method is cheaper, simpler, and selective for monomeric/dimeric phenols.