A green extraction process for polyphenols from elderberry (Sambucus nigra) flowers using deep eutectic solvent and ultrasound-assisted pretreatment

What happens when you combine nature's hidden chemical tricksters with soundwaves? You unlock a treasure trove of powerful plant compounds.

Elderberry flowers are packed with bioactive polyphenols, yet surprisingly few studies focus on extracting them efficiently. Enter a brilliant green chemistry solution: deep eutectic solvents. Researchers paired L-lactic acid with glycine to engineer a custom solvent, then fine-tuned the recipe using response surface methodology. The ideal blend featured an 85% aqueous solvent, a precise liquid-to-solid ratio, and gentle stirring, yielding an impressive amount of total polyphenols.

But the real magic happened when the team added ultrasonication to the mix. Pre-treating the mixture with soundwaves dramatically boosted polyphenol recovery to an even higher level. Advanced liquid chromatography-mass spectrometry analysis revealed that this nutrient-dense bounty was heavily dominated by beneficial compounds like rutin, chlorogenic acid, and a di-p-coumaroylquic acid.

This method proves that high-performance extraction and environmental responsibility can go hand in hand, offering a streamlined blueprint for harvesting valuable phytochemicals from botanical sources without harmful traditional chemicals.

Key Points

• Deep eutectic solvent made from L-lactic acid and glycine
• Ultrasonication pretreatment significantly boosted total polyphenol recovery
• Extracts were dominated by rutin and chlorogenic acid