2026-05-11T20:26:12Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/102912025-03-10T08:05:16Zcom_10259_4244com_10259_5086com_10259_2604col_10259_4569

Reactor configuration for subcritical water extraction of pectin-derived compounds from onion peel wastes: a comparative study Benito Román, Oscar Menalla, Enkeledo Cantero, Danilo Sanz Díez, Mª Teresa Beltrán Calvo, Sagrario The increasing interest of pectin derived compounds as functional additives in the pharmaceutical and food industries demands new sources and eco-friendly extraction approaches. In this regard, onion peel wastes (OPW) hold great potential, with over 450,000 tons of OPW being discarded annually [1], despite their remarkable pectin content. Pectins are commonly extracted acid hydrolysis (pH 2, >85 °C), that yield mainly the HG domain, due to complete hydrolysis of the branched domains or enzymatic hydrolysis, which is time consuming, but yields branched pectin rich in RG-I and RG-II domains. As an alternative to the conventional process for producing pectin derived compounds (PDC), hydrothermal hydrolysis based on subcritical water (SubW) is emerging as an eco-friendly technique. SubW refers to water at temperatures ranging from 100 °C (boiling temperature) to 374 °C (critical temperature), which remains in a liquid state due to the application of pressure. SubW can facilitate the extraction of pectin from natural matrices, and by controlling the operational parameters, pectin can be tailored into smaller units with varying degrees of polymerization to produce PDC. However, in practice, accurate control of experimental conditions has emerged as the primary challenge of the SubW extraction process, which can lead to the formation of undesired degradation products, and uncontrolled molecular weight reduction of the pectin. 2025-03-05T12:43:32Z 2025-03-05T12:43:32Z 2025-03-05T12:43:32Z 2024-05 info:eu-repo/semantics/conferenceObject 978-961-286-890-1 http://hdl.handle.net/10259/10291 10.18690/um.fkkt.2.2024 eng https://doi.org/10.18690/um.fkkt.2.2024 info:eu-repo/semantics/openAccess University of Maribor. Faculty of Chemistry and Chemical Engineering