title: High pressure extraction of antioxidants from Solanum stenotomun peel.
abstract: In the work described here, two techniques for the recovery of anthocyanins from potato peel were studied and compared. One of the techniques employed was supercritical fluid extraction (SFE) with pure CO2 or with CO2 and ethanol as cosolvent and the other technique was pressurized liquid extraction (PLE), where the solvent used was ethanol in water acidified to pH 2.6. The effects of pressure and temperature were studied and the anthocyanin contents obtained were statistically analyzed. In SFE the use of low pressure (100 bar) and high temperature (65 °C) was desirable for the anthocyanin extraction. With PLE the anthocyanin contents are increased considerably, and the best yields were obtained at 100 bar and 80 °C. This result is in correspondence with antioxidant activity index values (1.66) obtained in a DPPH antioxidant activity assay. In the extracts obtained with PLE the phenolic compounds were also determined, but the main compounds presented in the extract are anthocyanins.
authors.affiliation: Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cadiz, Campus de Excelencia International Agroalimentario ceiA3, Box 40, 11510 Puerto Real, Cadiz, Spain. lourdes.casas@uca.es
authors.forename: Lourdes Casas
authors.initials: LC
authors.lastname: Cardoso
authors.forename: Casimiro Mantell
authors.initials: CM
authors.lastname: Serrano
authors.forename: Edwin Torrez
authors.initials: ET
authors.lastname: Quintero
authors.forename: Clara Pereyra
authors.initials: CP
authors.lastname: López
authors.forename: Ruder Medrano
authors.initials: RM
authors.lastname: Antezana
authors.forename: Enrique J
authors.initials: EJ
authors.lastname: Martínez de la Ossa
mesh_terms: D000704:Analysis of Variance; D000872:Anthocyanins / Q000737:chemistry / Q000302:isolation & purification*; D001713:Biphenyl Compounds / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry; D016166:Free Radical Scavengers / Q000737:chemistry / Q000302:isolation & purification*; D005609:Free Radicals / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D006874:Hydrostatic Pressure; D059625:Liquid-Liquid Extraction / Q000379:methods; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification*; D032322:Solanum / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry
chemical_list: D000872:Anthocyanins; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D005609:Free Radicals; D010636:Phenols; D010851:Picrates; D010936:Plant Extracts; D012997:Solvents; D002245:Carbon Dioxide; D000431:Ethanol; C004931:1,1-diphenyl-2-picrylhydrazyl