Total recovery of the waste of two-phase olive oil processing: isolation of added-value compounds.
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.
Fernández-Bolaños
Juan
J
Food Biotechnology Departament, Instituto de la Grasa (CSIC), Avenida Padre García Tejero 4, Apartado 1078, 41012 Sevilla, Spain. jfbg@cica.es
Rodríguez
Guillermo
G
Gómez
Esther
E
Guillén
Rafael
R
Jiménez
Ana
A
Heredia
Antonia
A
Rodríguez
Rocío
R
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
D007220:Industrial Waste; D009005:Monosaccharides; D009844:Oligosaccharides; D000069463:Olive Oil; D010938:Plant Oils; D014867:Water; D008353:Mannitol