Valorization of the red algae gelidium sesquipedale by extracting a broad spectrum of minor compounds using green approaches

What if the secret to sustainable cosmetics and medicine has been washing ashore all along? A common red algae, long overlooked, is now yielding a treasure trove of bioactive compounds in just 15 minutes.

For decades, Gelidium sesquipedale has been harvested for one thing: agar. The rest of the alga was largely ignored, a byproduct with untapped potential. Now, scientists have turned their attention to the leftovers, and the results are impressive. Using ultrasound-assisted extraction (UAE) and eco-friendly solvents, they've unlocked a broad spectrum of minor compounds in record time—15 to 30 minutes, compared to 8 hours with conventional methods.

The extracts are packed with phenolics, flavonoids, mycosporine-like amino acids (MAAs), and phycobiliproteins—all valuable for their antioxidant and anti-enzymatic activities. The numbers speak for themselves: 189.3 mg of phenolics, 310.7 mg of flavonoids, 1271 mg of MAAs, and 72.4 mg of phycobiliproteins per 100 g of dry weight. These compounds have potential applications in medical and cosmetic products, from anti-aging creams to photoprotective agents.

What's more, this isn't a one-trick pony. The techniques are adaptable to other algae species, paving the way for a broader revolution in sustainable bioprospecting. The next time you see seaweed on the shore, remember: it might just be the future of green chemistry.

Key Points

• Green UAE extracts algae compounds in 15-30 min vs 8 hours.
• Rich in phenolics, flavonoids, MAAs, and phycobiliproteins.
• Potential for medical and cosmetic applications.