Extraction of phenolic compounds and anthocyanins from jucara (Euterpe edulis Mart.) residues using pressurized liquids and supercritical fluids

Extracts rich in phenolic compounds and anthocyanins from industrial residue of jucara (Euterpe edulis Mart.) were obtained using different high pressure extraction processes. Pressurized Liquid Extraction (PLE) was evaluated at 10 MPa and 40, 60 and 80 degrees C using ethanol, water, acidified mixture of ethanol + water and acidified water as solvents. The best solvent in PLE was selected as cosolvent for supercritical fluid extraction (SFE) with CO2. Among the PLE extracts, the highest antioxidant activity and concentration of phenolics were obtained with the acidified mixture of ethanol + water at 80 degrees C and the highest anthocyanin content was achieved with acidified water at 40 degrees C. Based on the PLE results, a two stage sequential extraction strategy was adopted, producing an extract rich in anthocyanins and another rich in heat resistant phenolic compounds. The selected cosolvent (acidified mixture ethanol + water) for SFE improved significantly the anthocyanin content. Four anthocyanins were identified and quantified by UPLC. (C) 2016 Elsevier B.V. All rights reserved.