2026-04-20T16:26:13Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/74732025-02-11T01:05:13Zcom_10259_4244com_10259_5086com_10259_2604col_10259_4245

Alonso Riaño, Patricia Ramos, Claudete Gindri Trigueros Andrés, Ester Beltrán Calvo, Sagrario Sanz Díez, Mª Teresa 2023-03-01T08:45:12Z 2023-03-01T08:45:12Z 2023-01 0926-6690 http://hdl.handle.net/10259/7473 10.1016/j.indcrop.2022.115927 The feasibility of an industrial-scale subcritical water (SW) system by scaling up from laboratory to pilot scale in a discontinuous operation mode has been investigated regarding the valorization of brewer´s spent grain (BSG). The subcritical water treatment (SWT) of BSG at the pilot scale in a discontinuous mode at 170 ◦C and 22 min, resulted in the release of 56% of the total carbohydrates present in the BSG. A total pentose yield of 78% was achieved (18% as monomer and 82% as oligomer). The concentration of inhibitors in the hydrolysate was relatively low, 0.22 g/L, 0.31 g/L, and 0.13 g/L of furfural and acetic and formic acids respectively. Other highvalue compounds were obtained, such as 6.5 g peptides/L (64% protein yield), 21 mg free amino acids/g protein (2.17% aa yield), and a total phenolic content (TPC) of 17.84 mg GAE/g dry BSG. In general, the results showed good reproducibility when scaling up from laboratory to pilot SW process. Good reproducibility of the scale-up was found for the release yield of arabinoxylo-oligomers, and gluco-oligomers from BSG, also for the protein yield and the release of free amino acids. However, the xylo-oligomers yield was 13% higher at the lab scale than at the pilot scale and higher concentrations of monomers and phenolic compounds were found in the SW hydrolysates obtained at the lab scale. Differences in the preheating time in both systems seem to have an effect on the hydrolysis yield of some the biopolymers. SWT modified the composition of the residual solid, as a decrease in the concentration of hemicellulose and an increase in the glucan content was observed, which may enhance the digestibility of the solid improving a further enzymatic release of glucose from the remaining solid. This work was supported by the Agencia Estatal de Investigacion, ´ Spain, [grant numbers PID2019–104950RB-I00 / AEI / 10.13039/ 501100011033, TED2021–129311B-I00 and PDC2022–133443-I00] and the Junta de Castilla y Leon ´ (JCyL), Spain and the European Regional Development Fund (ERDF) [grant number BU050P20]. E. Trigueros and P. Alonso-Riano ˜ predoctoral contracts are funded by JCyL and the European Social Fund (ESF) [ORDEN EDU/574/2018 and EDU/ 556/2019 respectively]. application/pdf eng Elsevier Industrial Crops and Products. 2023, V. 191, 115927 https://doi.org/10.1016/j.indcrop.2022.115927 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104950RB-I00/ES/VALORIZACION DE SUBPRODUCTOS MARINOS MEDIANTE TECNOLOGIAS DE FLUIDOS SUB- Y SUPERCRITICOS PARA LA OBTENCION DE BIOCOMPUESTOS VALIOSOS/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica, Técnica y de Innovación 2021-2023/TED2021-129311B-I00/ES/Tecnologías verdes basadas en el empleo de fluidos presurizados para valorizar biomasa lignocelulósica mediante la producción de furfural/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica, Técnica y de Innovación 2021-2023/PDC2022-133443-I00/ES/Diseño de un prototipo para la extracción de bioproductos con agua subcrítica/ info:eu-repo/grantAgreement/Junta de Castilla y León//BU050P20//Valorización de la fracción proteica de subproductos de la industria agroalimentaria de Castilla y León mediante tecnologías de fluidos presurizados/ Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Subcritical water treatment Scale-up Carbohydrates Protein Phenolic compounds Brewer's spent grain Ingeniería química Chemical engineering Study of subcritical water scale-up from laboratory to pilot system for brewer’s spent grain valorization info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Industrial Crops and Products 191