RT info:eu-repo/semantics/article
T1 Kinetics of extraction and degradation of pectin derived compounds from onion skin wastes in subcritical water
A1 Benito Román, Oscar
A1 Melgosa Gómez, Rodrigo
A1 Illera Gigante, Alba Ester
A1 Sanz Díez, Mª Teresa
A1 Beltrán Calvo, Sagrario
K1 Onion
K1 Subcritical water
K1 Pectin
K1 Hydrolysis
K1 Extraction
K1 Modelling
K1 Ingeniería química
K1 Chemical engineering
K1 Alimentos
K1 Food
AB In this work the valorization of onion skin wastes (OSW) as a source of the pectic oligosaccharides (POS), prebiotic hydrocolloids, using subcritical water (SubW) was thoroughly studied and modeled (using the Panchev's model) in a batch extractor at temperatures up to 165 °C and extraction times up to 180 min. The extraction of pectin derived compounds was notably sensitive to both variables, with the most favorable extraction rates occurring within a severity factor (logR0) range of 2.8–3.1. The highest recovery, 32 g of OGalA per 100 g of raw material, was achieved at 135 °C for 100 min. This process yielded various families of compounds categorized by their weight average molecular weight (Mw), with 85 kDa being the most prevalent, followed by 27, 17, and 7 kDa. The changes in Mw as a function of time and temperature was modeled using the Emsley equation, which enabled the prediction of POS molecular weight based on extraction conditions, as well as the calculation of the energy of activation for pectin derived compounds degradation (116 ± 2 kJ/mol). Additionally, along with the loss in molecular weight, the presence of degradation products such as formic acid and furfural increased with the intensity of the extraction conditions. In summary, the hydrothermal extraction conducted at temperatures between 125 and 135 °C facilitated the retrieval of POS with MW ranging from 7 to 85 kDa. This stands in contrast to the high MW (>300 kDa) and linear pectin obtained through conventional acid-water extraction processes.
PB Elsevier
SN 0268-005X
YR 2024
FD 2024-08
LK http://hdl.handle.net/10259/9815
UL http://hdl.handle.net/10259/9815
LA eng
NO This work was supported by the Agencia Estatal de Investigación (AEI) though projects PID2020-116716RJ-I00/AEI/10.13039/501100011033, PID2022-136385OB-I00/AEI/10.13039/501100011033 and TED2021-129311B-I00. Ó. Benito-Román's post-doctoral contract was funded by AEI through project PID2020-116716RJ-I00. R. Melgosa's contract was funded by a Beatriz Galindo Research Fellowship [BG20/00182]; A.E. Illera's post-doctoral contract was funded by Junta de Castilla y León and ERDF through project BU027P23.
DS Repositorio Institucional de la Universidad de Burgos
RD 22-dic-2024