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Innovative use of spent Brewer’s yeast for tannin adsorption from treatment solution

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dc.contributor.authorVieira, Elsa Marisa
dc.contributor.authorAmaral, Tomás
dc.contributor.authorDelerue-Matos, Cristina
dc.contributor.authorFerraz, Ricardo
dc.contributor.authorFerraz, Ricardo
dc.date.accessioned2025-11-21T16:32:53Z
dc.date.available2025-11-21T16:32:53Z
dc.date.issued2025
dc.description.abstractThis study aimed to evaluate the capacity of spent brewer’s yeast (BSY) to adsorb tannins and other phenolic compounds from an alkaline-extracted chestnut shell tannin solution (CS tannin extract). The alkaline extraction process used 5% NaOH (v/v), a method commonly employed to extract cellulosic material from chestnut shells (CSs). The findings of this research contribute to the development of more sustainable laboratory practices and enhance the economic viability of cellulosic material extraction from CS. Various treatments—lyophilization, immobilization in calcium alginate beads, and both alkaline and acid treatments—were applied to BSY to determine which method resulted in the highest tannin adsorption capacity from the CS tannin extract. Kinetic and equilibrium adsorption studies were performed to identify the best adsorption approach. The tannin content was analyzed using the Folin–Ciocalteau method, with results expressed as milligrams of tannic acid equivalents (TAEs) per milliliter of extract solution. The adsorbent material was characterized before and after the experiments; the characterization methods included the determination of the point of zero charge (pHPZC), Fourier Transform Infrared (FT-IR) Spectroscopy, and Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS). Equilibrium was reached within 10 min, with the highest (p < 0.05) biosorption capacity of tannins from the CS tannin extract observed in lyophilized BSY (35.51 ± 0.97 mg TAE per gram of BSY). The Sips models provided an adequate description of the adsorption process, indicating that tannin biosorption by BSY is driven by chemisorption. FTIR analysis identified various functional groups in BSY, with carboxyl, amino/hydroxyl, and amide groups playing a significant role in the biosorption process. Overall, these findings suggest that BSY has potential as a delivery system for the valorization of tannins from treatment solutions.por
dc.description.sponsorshipPOCI-01-0145-FEDER-029277
dc.identifier.citationVieira, E. M., Amaral, T., Ferraz, R., & Matos, C. (2024). Innovative use of spent Brewer’s yeast for tannin adsorption from treatment solution. 5th International Electronic Conference on Applied Sciences. https://sciforum.net/paper/view/21239
dc.identifier.urihttp://hdl.handle.net/10400.22/31019
dc.language.isoeng
dc.peerreviewedyes
dc.publisherMDPI
dc.relationPD21-00024
dc.relation.hasversionhttps://sciforum.net/paper/view/21239
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectBrewer's Spent Yeast (BSY)
dc.subjectChestnut shells tannin extract
dc.subjectLyophilization
dc.subjectAlginate immobilization
dc.subjectAcid treatment
dc.subjectAlkaline treatment
dc.subjectEquilibrium assay
dc.subjectKinetics assay
dc.titleInnovative use of spent Brewer’s yeast for tannin adsorption from treatment solutionpor
dc.typeconference poster
dspace.entity.typePublication
oaire.citation.conferenceDate2024
oaire.citation.title5th International Electronic Conference on Applied Sciences
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameFerraz
person.givenNameRicardo
person.identifier.ciencia-id001E-71CE-F92D
person.identifier.orcid0000-0002-1761-117X
person.identifier.ridG-5639-2011
person.identifier.scopus-author-id24464208500
relation.isAuthorOfPublicationa5a8faa7-12a5-4b1c-bced-44c895677397
relation.isAuthorOfPublication.latestForDiscoverya5a8faa7-12a5-4b1c-bced-44c895677397

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