RT info:eu-repo/semantics/article
T1 Fractionation and refining of pectic oligosaccharides derived from onion skins through continuous feed diafiltration
A1 Ruiz Pérez, María Olga
A1 Benito Román, Oscar
A1 Beltrán Calvo, Sagrario
A1 Sanz Díez, Mª Teresa
K1 Pectic oligosaccharide fractionation
K1 Diafiltration purification
K1 Membrane fouling
K1 Onion skin byproduct
K1 Green technologies
K1 Ingeniería química
K1 Chemical engineering
K1 Biotecnología
K1 Biotechnology
AB In this work, a diafiltration-based process was investigated for the recovery of pectic oligosaccharides produced by subcritical water hydrolysis from onion skin waste. Four tubular ceramic membranes from 100 to 1 kDa were selected based on the molecular weight of the different galacturonic acid species present in the onion skin hydrolysate. All these membranes showed high selectivity towards pectic oligosaccharides, with low retention for free galacturonic acid, monosaccharides, organic acids, and other impurities. The 50 and 100 kDa membranes completely retained pectic oligosaccharides with a molecular weight exceeding 80 kDa, accounting for approximately 30 % of the initial pectic oligosaccharides in the hydrolysate. However, the purification rate was significantly slower using the 50 kDa membrane due to the increased cake layer resistance. Furthermore, it was examined a fractionation/purification cascade involving sequential diafiltration stages using 100, 10, and 1 kDa membranes at 25 °C, TMP = 1 bar, and a crossflow velocity of 1.5 m s−1. Approximately 87 % of the initial pectic oligosaccharides were successfully recovered and purified in the retentates, highlighting their potential for diverse applications due to their narrow molecular weight distribution, while phenolic compounds and other valuable low molecular weight molecules were recovered in the final permeate.
PB Elsevier
SN 0376-7388
YR 2024
FD 2024-08
LK http://hdl.handle.net/10259/9585
UL http://hdl.handle.net/10259/9585
LA eng
NO This work was supported by the Agencia Estatal de Investigación [grant numbers  PID2020-116716RJ-I00 ,  PDC2022-133443-I00 ,  PID2022-136385OB-I00 ] and the Junta de Castilla y León (JCyL) and the European Regional Development Fund (ERDF) [grant number  BU027P23 ]. Benito Román post-doctoral contract was funded by the Agencia Estatal de Investigación through project  PID2020–116716RJ-I00 .
DS Repositorio Institucional de la Universidad de Burgos
RD 11-dic-2024