Combination of expeller and supercritical CO2 for the extraction of a phenolic-rich olive oil – A preliminary chemical characterization
This study aimed to develop and evaluate a sustainable olive oil (OO) extraction process that eliminates wastewater generation while producing high-quality oil and preserving the food-grade potential of byproducts. The method involves olive dehydration followed by a sequential two-step process combi...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/391036 |
| Acceso en línea: | http://hdl.handle.net/10261/391036 |
| Access Level: | acceso abierto |
| Palabra clave: | Dehydration Expeller Green technologies Olive oil Phenolic compounds Supercritical CO2 |
| Sumario: | This study aimed to develop and evaluate a sustainable olive oil (OO) extraction process that eliminates wastewater generation while producing high-quality oil and preserving the food-grade potential of byproducts. The method involves olive dehydration followed by a sequential two-step process combining cold pressing and supercritical CO2 extraction (SFE-CO2). This approach achieved a significantly higher extraction yield (92.6 %) compared to the 2-phase conventional process (37.8 %) while eliminating aqueous residues and avoiding the use of organic solvents or refining steps. A chemical analysis confirmed the extracted OO’s superior quality, with parameters like acid value, peroxide value, absorption coefficients (K232, K270, ΔK), and fatty acid profile, meeting legal limits for extra virgin classification. Notably, the absence of water during extraction and the use of SFE-CO2 significantly enhance the concentration of phenolic compounds (PCs) in the oil, press cake, and defatted flour. Preliminary analysis revealed PCs such as tyrosol (29 mg/kg), hydroxytyrosol (13 mg/kg), syringic acid (9.6 mg/kg), pinoresinol (1.8 mg/kg), and oleuropein (0.4 mg/kg), representing 3.7–16 times higher levels than those typically found in conventional OO. This method provides a sustainable and efficient alternative for OO extraction, enhancing the oil and byproducts’ nutritional value. |
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