2026-06-27T22:45:10Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/128952025-02-13T19:00:36Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Calvo Garrido, María Lourdes author Tirado Armesto, Diego Felipe author Fuente, Esther de la 2023-06-17T12:45:10Z 2023-06-17T12:45:10Z 2019 0260-8774 10.1016/j.jfoodeng.2019.07.030 https://hdl.handle.net/20.500.14352/12895 https://doi.org/10.1016/j.jfoodeng.2019.07.030 Alperujo, the solid-liquid waste generated by the current two-phase method of olive oil extraction, was dried, milled and treated with supercritical carbon dioxide (sc-CO2) to obtain a hydroxytyrosol (HT)-rich oil. At first, extraction rates were analysed as a function of operating variables and the pre-condition of the raw material. Samples with particle size diameter<0.80mm and in equilibrium moisture (1%) with the atmosphere, improved oil extraction yield almost 40% compared with samples with the whole range of particle sizes. Extraction yield improved with solvent flow rate, but a minimum residence time was required. The optimum was 0.18 kg h−1 (7.5 kg CO2 h−1 kg biomass−1). Higher pressures and lower temperatures resulted in higher extraction yields; at 30 MPa and 323 K the extraction curve slope was close to the theoretical oil solubility and the yield was 13%, like that obtained with n-hexane by Soxhlet (14%). However, the HPLC-DAD analysis identified higher HT concentration (1900 ppm) in the supercritical extracts at the highest temperature. Consequently, at 373 K, the total phenol content and the antioxidant capacity of the extracts was uppermost. No HT was found in the n-hexane extracts. eng A selective extraction of hydroxytyrosol rich olive oil from alperujo journal article URL https://docta.ucm.es/bitstreams/67d84cdc-40a2-4f54-a40b-e46f12580e43/download File MD5 7107256f4a4765b02345350f138fec76 830750 application/pdf A selective extraction of hydroxytyrosol rich olive oil from alperujo.pdf URL https://docta.ucm.es/bitstreams/9d52d09c-a461-42fe-9de5-07bfa1eae135/download File MD5 eb1afb727c52c1841bf9074467dcfcc7 53063 text/plain A selective extraction of hydroxytyrosol rich olive oil from alperujo.pdf.txt