Exploring Phenolic Compounds Extraction from Saffron (C. sativus) Floral By-Products Using Ultrasound-Assisted Extraction, Deep Eutectic Solvent Extraction, and Subcritical Water Extraction

Saffron's vibrant petals hide a treasure trove of health-boosting compounds—and we're just beginning to unlock them. What if flower waste could become the next big thing in green chemistry?

When you think of saffron, you probably imagine the precious red threads used in cooking. But the floral by-products—the petals and other parts left behind—are far from useless. They are packed with phenolic compounds, natural antioxidants with huge potential for nutraceuticals, pharmaceuticals, and cosmetics. The challenge? Extracting them efficiently without harming the environment.

Enter green extraction techniques (GETs). In this study, scientists compared three eco-friendly methods: ultrasound-assisted extraction (UAE), subcritical water extraction (SWE), and deep eutectic solvents extraction (DESE). Each technique was tested on saffron floral by-products, and the resulting phytochemical profiles were analyzed with high-resolution mass spectrometry and HPLC.

The results were striking. UAE, using a 50:50 ethanol/water mix, pulled out the most anthocyanins and flavonoids—up to 93.43 mg per gram of dry plant. For SWE, the best yield came from 96% ethanol at 125°C. But the real star was DESE: among 16 different solvent mixtures, the highest flavonoid content reached 110.95 mg/g, while choline chloride with butane-1,4-diol excelled for anthocyanins (16.0 mg/g).

These findings show that GETs can turn saffron waste into valuable bioactive extracts. This isn't just lab curiosity—it's a step toward a circular economy, where waste becomes resource. So next time you see saffron petals, think: that's not waste, it's potential.

Key Points

• Green techniques extract phenolics from saffron waste.
• UAE yields 93.43 mg/g anthocyanins and flavonoids.
• DESE hits 110.95 mg/g flavonoids, top performer.