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RESEARCH PRODUCT

Gas assisted mechanical expression (GAME) for the selective recovery of lipophilic and hydrophilic compounds from olive kernel

Loic LepreuxEugène VorobievFrancisco J. BarbaHoucine MhemdiMohamed Koubaa

subject

Aqueous solutionChromatographyRenewable Energy Sustainability and the EnvironmentChemistryStrategy and Management010401 analytical chemistryExtraction (chemistry)04 agricultural and veterinary sciencesMass spectrometry040401 food science01 natural sciencesIndustrial and Manufacturing EngineeringSupercritical fluid0104 chemical sciences0404 agricultural biotechnologyYield (chemistry)Olive oil extractionDegradation (geology)Gas chromatographyGeneral Environmental Science

description

Abstract This work is devoted to valorize olive kernel; a by-product produced during olive oil extraction process. For this purpose, aqueous liquid solid extraction (LSE), mechanical expression (ME), supercritical CO2 (SC-CO2) and gas assisted mechanical expression (GAME), processes were compared when applied separately or consequently (ME + GAME), in terms of total phenolic compound (TPC) and oil recovery yields. Results showed that although the high extraction yields of TPC using LSE (61.4 ± 1.3%), the extraction process is economically not viable. However, it was demonstrated that applying ME (1 h at 30 MPa) followed by GAME (1 h at 30 MPa ME and 10 MPa SC-CO2 pressures) allowed recovering extracts enriched with TPC (≈50% yield) and oil (≈80% yield), respectively. Recovered phenolic compounds and oil were then identified using liquid and gas chromatography – mass spectrometry, showing no degradation and high oil quality compared to commercial virgin oil.

https://doi.org/10.1016/j.jclepro.2017.07.253