2026-04-22T11:07:31Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/60272021-11-02T12:01:51Zcom_10259_4244com_10259_5086com_10259_2604col_10259_4245

Trigueros Andrés, Ester 557 500 Sanz Díez, Mª Teresa 530 500 Alonso Riaño, Patricia aad9756c-ad87-4f31-ba02-459668ce3469 500 Beltrán Calvo, Sagrario 57 500 Ramos Rodríguez, Cipriano 464 500 Melgosa Gómez, Rodrigo 357 500 2021-10-15T10:27:19Z 2021-10-15T10:27:19Z 2021 0921-8971 http://hdl.handle.net/10259/6027 10.1007/s10811-020-02349-0 1573-5176 In this work valorization of the underexploited industrial solid residue generated after agar extraction from Gelidium sesquipedale was studied by using subcritical water in a semicontinuous fix-bed reactor. First, a complete characterization of this by-product was carried out, determining up to 21%(w/w) of protein content (for a nitrogen factor of 4.9) with high content of essential amino acids, 37% (w/w) of carbohydrate fraction and high amount of ash, 22% (w/w). The effect of temperature, in the range from 129 to 200 °C, and flow rate, in the range from 2 to 6 mL min−1, on protein and carbon fraction extraction/hydrolysiswas studied.At constant flow rate of 2 mL min−1, a maximum in the protein extraction was achieved at 185 °C. Higher temperatures led to degradation of protein or its hydrolysis products. Free amino acids release followed the same trend as the protein fraction. The most temperature sensitive amino acids, as determined by gas chromatography (EZ:faast Phenomenex), were serine and aspartic and glutamic acids. As a consequence, the selectivity towards non-polar amino acids increased by working at high severity factors. A Pearson correlation between antioxidant capacity of the collected extracts with the bioactive compounds determined in the extracts (total polyphenolic compounds –TPC-, peptides and free amino acids) was established, being stronger for TPC. The ash content in the solid residue after treatment steadily increased with temperature due to non-solubilization being possible its application in agriculture as fertilizers. Agencia Estatal de Investigación [grant number PID2019-104950RB-I00 / AEI / https://doi.org/10.13039/501100011033] and the Junta de Castilla y León (JCyL) and the European Regional Development Fund (ERDF) [grant number BU301P18 and BU050P20] application/pdf eng Springer Journal of Applied Phycology. 2021, V. 33, n. 2, p. 1181–1194 https://doi.org/10.1007/s10811-020-02349-0 info:eu-repo/grantAgreement/AEI/PID2019-104950RB-I00-AEI-10.13039-501100011033 info:eu-repo/grantAgreement/JCyL/BU301P18 info:eu-repo/grantAgreement/JCyL/BU050P20 Subcritical water extraction Biorefinery Macroalgae residue Protein Amino acids Antioxidant activity Ingeniería química Chemical engineering Recovery of the protein fraction with high antioxidant activity from red seaweed industrial solid residue after agar extraction by subcritical water treatment info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/openAccess Journal of Applied Phycology 33 2 1181 1194 ORIGINAL Trigueros-jap_2021.pdf Trigueros-jap_2021.pdf application/pdf 731909 https://riubu.ubu.es/bitstream/10259/6027/1/Trigueros-jap_2021.pdf 82b0814bb837f4440a6fd5f4f9ba9600 MD5 1 LICENSE license.txt license.txt text/plain; charset=utf-8 998 https://riubu.ubu.es/bitstream/10259/6027/2/license.txt aa90105e1c90a1b4fe810649aa967b7d MD5 2 THUMBNAIL Trigueros-jap_2021.pdf.jpg Trigueros-jap_2021.pdf.jpg IM Thumbnail image/jpeg 4670 https://riubu.ubu.es/bitstream/10259/6027/3/Trigueros-jap_2021.pdf.jpg 142af0bc2f088ed169c75049f05df44d MD5 3 10259/6027 oai:riubu.ubu.es:10259/6027 2021-11-02 13:01:51.176 Repositorio Institucional de la Universidad de Burgos bubrep@ubu.es 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