2026-04-17T03:02:08Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/108702025-09-16T00:05:36Zcom_10259_9397com_10259_5087com_10259_2728col_10259_9398
Benito Moreno, José Manuel
58
500
0000-0001-8899-0448
Díez Carretero, Paula
ccff1979-d8c7-49e2-a00f-67aa06b9c0d0
600
Universidad de Burgos. Departamento de Biotecnología y Ciencia de los Alimentos
d7ac09bf-b8c0-4b30-833f-0672b8f2f022
500
2025-09-15T08:08:28Z
2025-09-15T08:08:28Z
2025-07
https://hdl.handle.net/10259/10870
Wheat bran and onion skin waste are agri-food by-products generated in large quantities
annually. Their valorization represents an important opportunity, linked to sustainability, for
obtaining bioactive compounds with beneficial properties. These by-products are notable for
their high content of bioactive compounds, specifically phenolic compounds, among which
quercetin and ferulic acid stand out for their antioxidant activity. The main aim of this work has
been to study the technical feasibility of a combined ultrasound-assisted extraction (UAE) /
nanofiltration (NF) process for the recovery of phenolic compounds present in wheat bran and
onion skin wastes generated as by-products in local food companies.
UAE was firstly performed for the extraction of polyphenols from wheat bran (WB) and onion
skin waste (OSW) using an acetate buffer at pH 5 and an aqueous ethanol solution (70 vol.
%) as solvents, respectively, under the optimum operating conditions. A final WB extract was
obtained with a total polyphenol content (TPC) of 3.56 ± 0.18 mg GAE/g WB and an antioxidant
activity (AA) of 7.75 ± 1.20 µmol Fe2+/g WB. An OSW extract was also obtained, with a TPC of
44.47 ± 0.83 mg GAE/g OSW, a total flavonoid concentration (TFC) of 19.22 ± 0.35 mg QE/g
OSW, and an AA of 28.38 ± 2.70 mg Trolox/g OSW. Ferulic acid is the main component of
wheat bran extract, while quercetin and its glycosylated derivatives are the main components
of onion skin extract.
Both extracts were then concentrated by nanofiltration (NF) in a high pressure stirred cell,
using a NF270 flat polyamide membrane (270 Da cut-off), under optimal operating conditions
reaching a volume concentration ratio (VCR) of 5 after 7,5 and 1,8 h for WB and OSW extracts,
respectively, with minimal loss of polyphenols in the permeates and recoveries of AA, TPC,
and TFC in the concentrates higher than 99% in all cases.
The results obtained in this study could contribute to the valorization of agri-food waste using
environmentally friendly techniques, demonstrating the potential o
TED2021-129311B-I00 – Tecnologías verdes basadas en el empleo de fluidos presurizados para valorizar biomasa lignocelulósica mediante la producción de furfural (GREENFUR), financiado por el Ministerio de Ciencia e Innovación. PID2022-136385OB-I00 – Nuevas estrategias para la producción de ácido láctico de segunda generación empleando tecnologías emergentes basadas en fluidos presurizados (2BIOLAC), financiado por la Agencia Estatal de Investigación. BU027P23 – Tecnologías sostenibles de fluidos presurizados para valorizar subproductos de la industria agroalimentaria ricos en proteínas: nuevas estrategias, escalado y análisis tecnoeconómico y medioambiental (SOSPROTEIN), financiado por la Junta de Castilla y León y el Fondo Europeo de Desarrollo Regional (ERDF).
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Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Wheat bran
Onion skin waste
Polyohenols
Ultrasound-assisted extraction
Nanofiltration
Antioxidant activity
Flavonoids
Ferulic acid
Quercetin
Ingeniería Química
Chemical engineering
Alimentos
Food
Recuperación de polifenoles presentes en salvado de trigo y piel de cebolla mediante un proceso combinado de extracción asistida por ultrasonidos y nanofiltración
info:eu-repo/semantics/bachelorThesis
info:eu-repo/semantics/acceptedVersion
THUMBNAIL
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LICENSE
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ORIGINAL
Díez_Carretero_Paula-TFG.pdf
Díez_Carretero_Paula-TFG.pdf
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https://riubu.ubu.es/bitstream/10259/10870/1/D%c3%adez_Carretero_Paula-TFG.pdf
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10259/10870
oai:riubu.ubu.es:10259/10870
2025-09-16 02:05:36.95
Repositorio Institucional de la Universidad de Burgos
bubrep@ubu.es
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