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Trigueros Andrés, Ester Sanz Díez, Mª Teresa Beltrán Calvo, Sagrario Ruiz Pérez, María Olga 2023-02-14T08:41:32Z 2023-02-14T08:41:32Z 2022-10 0376-7388 http://hdl.handle.net/10259/7453 10.1016/j.memsci.2022.120822 An ultrafiltration-based process for oligosaccharide and peptide fractionation from a macroalgae subcritical water hydrolysate was studied. A wide range of separation results was obtained depending on the membrane pore. 100 kDa cut-off size was enough for hydrolysate clarification with total retention of colloidal materials. Oligosaccharides present in the hydrolysate showed the highest retention with all membranes, glucans mostly, followed by galactans, and finally arabinans. Peptides obtained after subcritical water treatment were some of the lowest rejected compounds, even using a 5 kDa membrane. The increase in temperature from 20 to 50 ◦C and feed flow rate from 6.6 to 11.2 L/h enhanced permeate flux for 5 kDa membrane, without perturbing the membrane retention. The Hermia’s models identified the cake layer resistance as the major fouling resistance in hydrolysate filtrations at 20 ◦C, but standard pore blockage was the principal fouling mechanism at 50 ◦C. A fractionation process with sequential filtration stages at 20 ◦C and TMP = 1.1 bar was examined. Oligosaccharides were fractionated in the retentates of the sequential filtrations with 100, 5 and 1 kDa membranes. The final permeate collected from the 1 kDa membrane was freeze-dried to obtain a peptide-rich solid (71 wt%) that could be used in different applications. The authors gratefully acknowledge the financial support provided by the Agencia Estatal de Investigación [grant number PID2019–104950RB-I00/AEI/10.13039/501100011033] and by the Junta de Castilla y León (JCyL) and the European Regional Development Fund (ERF) [grant number BU050P20]. E. Trigueros predoctoral contract was funded by the JCyL and the European Social Fund (ESF) by ORDEN EDU/574/2018. application/pdf eng Elsevier Journal of Membrane Science. 2022, V. 660, 120822 https://doi.org/10.1016/j.memsci.2022.120822 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//BU050P20//Valorización de la fracción proteica de subproductos de la industria agroalimentaria de Castilla y León mediante tecnologías de fluidos presurizados/ Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Peptide purification Oligosaccharide recovery Membrane fouling Macroalga byproducts Biorefinery Química orgánica Ingeniería química Chemistry, Organic Chemical engineering Filtration of subcritical water hydrolysates from red macroalgae byproducts with ultraporous ceramic membranes for oligosaccharide and peptide fractionation info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Journal of Membrane Science 660