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Environmentally friendly and cost-effective approaches to reduce toxin content in toxic cyanobacterial biomasses

2024-06-03Journal article Open access
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dc.contributor.authorLoss, Letícia
dc.contributor.authorAzevedo, Joana
dc.contributor.authorAzevedo, Tomé
dc.contributor.authorFreitas, Marisa
dc.contributor.authorVasconcelos, Vítor
dc.contributor.authorCampos, Alexandre
dc.date.accessioned2024-12-23T09:07:35Z
dc.date.available2024-12-23T09:07:35Z
dc.date.issued2024-06-03
dc.description.abstractCyanobacterial outgrowths are naturally occurring processes in eutrophic aquatic ecosystems. Furthermore, as a result of climate change and anthropogenic pollution, cyanobacteria harmful algal blooms (CyanoHABs) are expanding worldwide. CyanoHABs are considered a threat to human health and environment due to the production of potent toxic substances, but at the same time, valuable products can be obtained from these microorganisms. The main objective of this study was to test straightforward and cost-effective methods to reduce the toxin content of cyanobacterial biomass for the exploitation of this important biological resource. To carry out this study, lyophilized or hydrated biomass from microcystin-LR (MC-LR) producing Microcystis aeruginosa and cylindrospermopsin (CYN) producing Chrysosporum ovalisporum strains were subjected to the following treatments: (1) thermal (50 °C); (2) ultraviolet (UV) radiation; (3) ozone; and (4) sunlight, for periods varying between 2 and 12 h. MC-LR and CYN concentrations were quantified by LC-MS and compared between experimental groups. The results show a significant reduction in the amount of MC-LR in M. aeruginosa biomass (lyophilized and hydrated) exposed to sunlight. Since no other treatment reduced MC-LR in M. aeruginosa biomass, this molecule was demonstrated to be very stable. Regarding CYN, the concentration of this toxin in C. ovalisporum biomass was significantly reduced with the exposure to UV radiation, to approximately 51% of the initial concentration after 2 h of exposure; 86% reduction after 5 h of exposure; and 77% reduction after 12 h of exposure. Overall, this study demonstrates that the toxicity of cyanobacterial biomass can be reduced by employing environmentally friendly and cost-effective treatments with sunlight and UV radiation.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationLoss, L., Azevedo, J., Azevedo, T., Freitas, M., Vasconcelos, V., & Campos, A. (2024). Environmentally friendly and cost-effective approaches to reduce toxin content in toxic cyanobacterial biomasses. Biomass, 4(2), Artigo 2. https://doi.org/10.3390/biomass4020027pt_PT
dc.identifier.doi10.3390/biomass4020027pt_PT
dc.identifier.eissn2673-8783
dc.identifier.urihttp://hdl.handle.net/10400.22/26917
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationThis project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 823860 and from the Strategic Funding UIDB/04423/2020 and UIDP/04423/2020 through national funds provided by Portuguese Foundation for Science and Technology (Fundação para a Ciência e Tecnologia; FCT) and the European Regional Development Fund (ERDF) in the framework of the program PT2020. Alexandre Campos’s work contract was funded by FCT (CEECIND/03767/2018).pt_PT
dc.relation.publisherversionhttps://www.mdpi.com/2673-8783/4/2/27pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMicrocystis aeruginosapt_PT
dc.subjectChrysosporum ovalisporumpt_PT
dc.subjectCylindrospermopsinpt_PT
dc.subjectMicrocystin-LRpt_PT
dc.subjectOzonept_PT
dc.subjectUltraviolet radiationpt_PT
dc.subjectSunlightpt_PT
dc.titleEnvironmentally friendly and cost-effective approaches to reduce toxin content in toxic cyanobacterial biomassespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleBiomasspt_PT
oaire.citation.volume4(2)pt_PT
person.familyNameFreitas
person.givenNameMarisa
person.identifier.ciencia-id131C-AD64-7E5F
person.identifier.orcid0000-0003-1886-4942
person.identifier.scopus-author-id7102366695
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationee4b4693-5911-46e5-9247-129bafa5a864
relation.isAuthorOfPublication.latestForDiscoveryee4b4693-5911-46e5-9247-129bafa5a864

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