Abstract
The solid waste generated in industrial berry juice production was considered as a low cost raw material for the extraction of natural antioxidants. Berries contain phenolic compounds with high antioxidant potential, including anthocyanins, proanthocyanidins, flavonols, catechins, benzoic and cinnamic acids. The solid residues generated from blueberry, cranberry and raspberry after pressing were extracted by conventional solvent extraction or by supercritical CO2 (SC–CO2) extraction. The effect of particle size and extraction time on the extraction yield, phenolic yield and phenolic content of the extracts produced by conventional solvents was assessed. Supercritical CO2 extraction was performed during 2 h operating in the range 80–300 bar at 60 °C using 2.5 L CO2/h. Maximum solubles yield of 5.20% were extracted from raspberry wastes at 200 bar, 3.89% from cranberry wastes at 250 bar and 1.4% from blueberry wastes at 200 bar. The highest phenolic content of the extracts was observed for blueberry pomace in the trap, with 9 grams of gallic acid equivalents per 100 g of extract. The ABTS (2, 2′-azino-bis-[3-ethylbenzotiazol-6-sulfonic acid]) and DPPH (α,α-diphenyl-β-picrylhydrazyl) radical scavenging capacity of the SC–CO2 extracts was moderate in comparison with the activity of conventional solvent extracts.
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Acknowledgments
The authors are grateful to MCYT-FEDER (Research Project AGL2003-03596), Xunta Galicia (Research Project PGIDT, 04PXI38301PN) and CONICYT (Research Proyects FONDECYT N 1070258 and FONDEF D07I1045) for the financial support of this work. A. M. thanks the Isidro Parga Pondal Program of Xunta Galicia, B. D. R thanks the Spanish MEC (Grant BES-2005-7525) and L. L. is grateful to the MECE Program (Chile).
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Laroze, L.E., Díaz-Reinoso, B., Moure, A. et al. Extraction of antioxidants from several berries pressing wastes using conventional and supercritical solvents. Eur Food Res Technol 231, 669–677 (2010). https://doi.org/10.1007/s00217-010-1320-9
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DOI: https://doi.org/10.1007/s00217-010-1320-9