2026-05-12T06:50:30Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/102902025-03-10T07:58:39Zcom_10259_4244com_10259_5086com_10259_2604col_10259_4569

2025-03-05T12:31:46Z urn:hdl:10259/10290 Valorization of onion skin wastes using subcritical water: flavonoids and pectin recovery Benito Román, Oscar Sanz Díez, Mª Teresa Beltrán Calvo, Sagrario Onion Subcritical water Pectin Quercetin Valorization Comunicación oral presentada en: 2nd Greenering International Conference 2023, celebrada durante los días 21-23 de marzo en Valladolid (España) Onion skin wastes (OSW) represent around 10% of the total onion production and end up in landfills because they are not suitable for human consumption or animal feeding. Nevertheless this non-edible brown skin and external layers of onions are rich and phenolic compounds, mainly flavonoids such as quercetin and derivatives, which are high-added valye natural antioxidants. Additionally, onion skin has gained attention as a good source of pectin. Pectin, a complex polysaccharide composed by uronic acids (66.4%) and neutral sugars (galactose, arabinose, xylose, mannose, glucose or rhamnose) in variable composition, is the major structural component onion cell walls (42,4%). Considering that according to FAO, 2020 onion worldwide production was 104 Mt, there is a great potential for the calorization of the OSW through the recovery of flavonoids and pectin. 2025-03-05T12:31:46Z 2025-03-05T12:31:46Z 2023 info:eu-repo/semantics/conferenceObject http://hdl.handle.net/10259/10290 eng https://eventos.uva.es/84985/files/2nd-greenering-international-conference.html info:eu-repo/semantics/openAccess