title: Total recovery of the waste of two-phase olive oil processing: isolation of added-value compounds.
abstract: A process for the value addition of solid waste from two-phase olive oil extraction or "alperujo" that includes a hydrothermal treatment has been suggested. In this treatment an autohydrolysis process occurs and the solid olive byproduct is partially solubilized. From this water-soluble fraction can be obtained besides the antioxidant hydroxytyrosol several other compounds of high added value. In this paper three different samples of alperujo were characterized and subjected to a hydrothermal treatment with and without acid catalyst. The main soluble compounds after the hydrolysis were represented by monosaccharides xylose, arabinose, and glucose; oligosaccharides, mannitol and products of sugar destruction. Oligosaccharides were separated by size exclusion chromatography. It was possible to get highly purified mannitol by applying a simple purification method.
authors.affiliation: Food Biotechnology Departament, Instituto de la Grasa (CSIC), Avenida Padre García Tejero 4, Apartado 1078, 41012 Sevilla, Spain. jfbg@cica.es
authors.forename: Juan
authors.initials: J
authors.lastname: Fernández-Bolaños
authors.forename: Guillermo
authors.initials: G
authors.lastname: Rodríguez
authors.forename: Esther
authors.initials: E
authors.lastname: Gómez
authors.forename: Rafael
authors.initials: R
authors.lastname: Guillén
authors.forename: Ana
authors.initials: A
authors.lastname: Jiménez
authors.forename: Antonia
authors.initials: A
authors.lastname: Heredia
authors.forename: Rocío
authors.initials: R
authors.lastname: Rodríguez
mesh_terms: D003460:Crystallization; D005511:Food Handling; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007220:Industrial Waste / Q000032:analysis*; D008353:Mannitol / Q000737:chemistry / Q000302:isolation & purification; D009005:Monosaccharides / Q000032:analysis; D009844:Oligosaccharides / Q000302:isolation & purification; D000069463:Olive Oil; D010938:Plant Oils; D012995:Solubility; D014867:Water
chemical_list: D007220:Industrial Waste; D009005:Monosaccharides; D009844:Oligosaccharides; D000069463:Olive Oil; D010938:Plant Oils; D014867:Water; D008353:Mannitol