2026-09-21T12:31:36Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/60842024-04-16T12:31:41Zcom_10259_4244com_10259_5086com_10259_2604col_10259_4245

00925njm 22002777a 4500 dc Niknam, S. Mehdi author Kashaninejad, Mansoore author Escudero Barbero, Isabel author Sanz Díez, Mª Teresa author Beltrán Calvo, Sagrario author Benito Moreno, José Manuel author 2021-09 Olive pomace, a solid residue generated during olive oil production process and a rich source of phenolic compounds, was dried and defatted to obtain a pomace oil rich in monounsaturated fatty acids with 64% oleic acid. The defatted pomace was further treated by ultrasound-assisted extraction (UAE). The optimal phenol extraction conditions of 10 min, 40% amplitude and 4% (w/v) solid:solvent ratio, yielded to 14.70 mg/g total phenols, 2.48 mg/g total flavonoids and 0.924 mmol Trolox/g antioxidant activity. In order to purify valuable biophenols, two polymeric resins (XAD4 and XAD16) and two activated charcoals (NPAC and GAC) were tested as adsorbents using a magnetic stirrer and an incubator shaker. XAD16 (100 g/L) in magnetic stirrer showed the optimal adsorption ratios with 74.36%, 39.25%, 68.79% and 100% for total phenols, hydroxytyrosol, tyrosol and oleuropein, respectively. Desorption using acidified 50% (v/v) ethanol-water at pH = 2.3 proved 57.65% recovery of total phenols, 19.27% of hydroxytyrosol and 45.73% of tyrosol. These results indicate that extraction and selective purification of biophenols from olive pomace can be achieved by the proposed UAE using 50% v/v ethanol-water as solvent, followed by adsorption-desorption stages with the XAD16 polymeric resin. 0959-6526 http://hdl.handle.net/10259/6084 10.1016/j.jclepro.2021.128340 Olive pomace Ultrasound-assisted extraction Response surface methodology Phenolics adsorption-desorption Valorization of olive mill solid residue through ultrasound-assisted extraction and phenolics recovery by adsorption process