RT info:eu-repo/semantics/article
T1 Freeze-dried extract from onion (Allium cepa cv. Horcal) skin wastes: Extraction intensification and flavonoids identification
A1 Benito Román, Oscar
A1 Blanco Alcalde, Beatriz
A1 Sanz Díez, Mª Teresa
A1 Beltrán Calvo, Sagrario
K1 Onion
K1 Extraction
K1 Ultrasounds
K1 Quercetin
K1 Flavonoids
K1 Process intensification
K1 Ingeniería química
K1 Chemical engineering
K1 Alimentos
K1 Food
AB In this work, the intensification of the extraction of flavonoids from dry onion skin wastes (DOSW) by Ultrasound Assisted Extraction (UAE) was investigated. Conventional stirred tank extraction was used to find the optimal temperature (37 °C) and solvent (ethanol 70%, v/v), providing 20.7 ± 0.4 mg QE/g DOSW after 1 h. In the UAE process, the amplitude of oscillation and the solvent-to-solid ratio were key parameters to control the specific energy used. Energies above 10 kJ/g OSW did not increase the extraction yield (maximum flavonoids content was 23.9 ± 0.2 mg QE/g DOSW), which could be obtained using amplitudes of 40%, high solvent-to-solid ratios (30 mL/g DOSW) and extraction times below 5 min. Although both extraction techniques provided similar profiles of phenolic compounds, being quercetin and quercetin-4′-O-glucoside the main flavonoids (7.4 mg/g DOSW and 10.4 mg/g DOSW, respectively), UAE increased the productivity up to 11.6 mg QE/(g DOSW·min), seven times higher than conventional extraction. The extraction kinetics was modeled and studied. The optimum extract was freeze-dried resulting in a solid powder rich in flavonoids (21%) which kept 90% of the antioxidant activity after 180 days of storage at temperatures below 4 °C.
PB Elsevier
SN 0960-3085
YR 2021
FD 2021-11
LK http://hdl.handle.net/10259/6092
UL http://hdl.handle.net/10259/6092
LA eng
NO Junta de Castilla y León (JCyL) and the European Regional Development Fund (ERDF) [grant numbers BU301P18 and BU050P20] and the Agencia Estatal de Investigación [grant number PID2019-104950RB-I00/AEI/10.13039/501100011033 and PID2020-116716RJ-I00]. OBR’s postdoctoral contract through project BU301P18 is gratefully acknowledged. To JCyL and European Social Fund (ESF) for the contract of D. Benito-Bedoya and D. M. Aymara-Caiza through the YEI program, who participated in this work as technicians.
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024