Green strategies for the valorization of industrial medicinal residues of Serenoa repens small (saw palmetto) as source of bioactive compounds

What if the waste from a prostate-cancer-fighting plant could become a treasure trove of bioactive compounds? Scientists just found a green way to turn saw palmetto leftovers into valuable molecules.

Saw palmetto, a medicinal plant renowned for treating urological disorders, leaves behind tons of fruit residues after pharmaceutical extraction. These leftovers, usually discarded, still hold valuable compounds—if you know how to get them out. Researchers set out to do just that using eco-friendly methods.

First, they used supercritical CO2, a green solvent, to extract residual fatty acids and polyprenols from the dry biomass. The yield was 1.2%, with polyprenols making up 1.6% of the extract. These unsaturated isoprenoid alcohols could have promising biomedical applications.

Then, they switched to subcritical water, heating it up to 180°C to pull out polar compounds. The higher the temperature, the higher the yield—showing that heat can unlock hidden potential in waste. This two-step process turns trash into treasure, aligning perfectly with circular economy goals.

The study proves that industrial medicinal residues aren't useless; they're an untapped resource. With green chemistry, we can valorize what was once thrown away, paving the way for sustainable production of bioactive ingredients.

Key Points

• Supercritical CO2 yielded 1.2% from saw palmetto waste.
• Polyprenols found at 1.6% of extract weight.
• Subcritical water extraction improved yield up to 180°C.