2026-04-20T13:00:51Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/62822022-12-02T13:08:56Zcom_10259_4244com_10259_5086com_10259_2604col_10259_4245

Trigueros Andrés, Ester Alonso Riaño, Patricia Ramos Rodríguez, Cipriano Diop, Cherif Ibrahima Khalil Beltrán Calvo, Sagrario Sanz Díez, Mª Teresa 2021-12-13T15:18:11Z 2021-12-13T15:18:11Z 2021-12 2213-3437 http://hdl.handle.net/10259/6282 10.1016/j.jece.2021.106768 The valorization of the underexploited solid residue after agar extraction from red marine algae was studied by subcritical water treatment. Experiments were carried out in two different semi-continuous fix-bed reactor configurations at 185 ºC at different subcritical water residence times. The use of a by-pass section allowed to heat the water previous contact to the biomass, avoiding the exposure of the sample to high temperatures during the heating procedure and reducing the formation of degradation products. Higher hydrolysis yields were obtained for the protein fraction (reaching 96.1%) than for the carbohydrate fraction (reaching 45.7%, 11.3%, 27.5% and 57.6% for galactans, glucans, arabinans and uronic acids, respectively). With the decrease of the residence time, by increasing the flow rate, higher initial hydrolysis rates were obtained due to enhancing diffusion of the hydrolysis products into the bulk solution. It was determined a similar dependence of the initial hydrolysis rates on the residence time for the carbohydrate oligomers and total protein fraction, but the release of free amino acids was less dependent on increasing flow rate due to higher diffusion coefficients for small molecules. Agencia Estatal de Investigación (Spain) [grant number PID2019–104950RB-I00 / AEI / 10.13039/501100011033], the Junta de Castilla y León (JCyL) and the European Regional Development Fund (ERDF) [grant numbers BU301P18 and BU050P20] E. Trigueros and P. Alonso-Riaño predoctoral contracts were funded by the JCyL and the European Social Fund (ESF) by ORDEN EDU/574/2018, de 28 de mayo and ORDEN EDU/556/2019, de 5 de junio, respectively. The C. I. K. Diop contract was funded by the European Commission, Horizon 2020 program through the Marie-Curie Individual Fellowship (H2020-MSCA-IF-2019), with regards to the ALGWAS-BIOR project (Grant agreement number 898804). application/pdf eng Elsevier Journal of Environmental Chemical Engineering. 2021, V. 9, n. 6, 106768 https://doi.org/10.1016/j.jece.2021.106768 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/Junta de Castilla y León//BU301P18//Valorización integral de subproductos de la industria agroalimentaria mediante tecnologías emergentes (ALVALOR) 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 info:eu-repo/grantAgreement/EC/H2020/898804/EU/Sustainable Valorization Of The Algae Industry Waste-Stream Within An Advanced Clean Technologies-Based Integrated Biorefinery Concept Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Subcritical water hydrolysis (subW) Heating Residence time Biorefinery Macroalgae by-products Bio compounds Ingeniería química Chemical engineering Kinetic study of the semi-continuous extraction/hydrolysis of the protein and polysaccharide fraction of the industrial solid residue from red macroalgae by subcritical water info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion