Supercritical fluid extraction from spent coffee grounds and coffee husks: Antioxidant activity and effect of operational variables on extract composition

► Coffee industry residues. ► Antioxidant sources. ► Increase the aggregated value of agroindustrial residues. ► The composition of coffee residue extracts suggests a high potential for industrial application. ► The supercritical technology was efficient for caffeine extraction from the residues.