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Production of exopolymer substances from the thermophilic chlorophyte Graesiella: industrial and ecological applications

2020Journal article Open access
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dc.contributor.authorGongi, Wejdene
dc.contributor.authorCordeiro, Nereida
dc.contributor.authorPinchetti, Juan Luis Gómez
dc.contributor.authorBen Ouada, Hatem
dc.date.accessioned2021-04-13T11:16:53Z
dc.date.available2021-04-13T11:16:53Z
dc.date.issued2020
dc.description.abstractMicroalgal extracellular polymeric substances (EPSs) are heteropolysaccharides that have characteristics suitable for industrial and biotechnological applications. Notably, they have strong anionic nature and high hydrophobicity. Nevertheless, systematic studies to demonstrate the viability of the production of EPSs on an industrial scale are still crucial. In this research, the chlorophyte Graesiella was grown on a raceway pond to view its EPS valorization. The biomass production achieved a maximum of 1.98 g L−1 and an EPS production of 1.6 g L−1 after six production days. The Graesiella EPSs with a molecular weight above 100 kDa are sulfated exopolymers containing mainly polysaccharide (70%) and protein (16%). The EPSs produced more stable emulsions with hydrocarbons and oils than Tween-20. The emulsification indices with n-hexane (88%) and maize oil (28%) indicate the EPSs’ strong emulsion-stabilizing capacity. The EPSs showed a peak flocculating percentage of 95% to kaolin suspension, with better flocculation performance than Al2(SO4)3 and alginate. Moreover, Graesiella EPSs had a significant effect on antimicrobial activity, significantly inhibiting fungal growth (71% for Botytis cinerea and 87% for Fusarium oxysporum), spore germination (100% of inhibition at a concentration of 1.8 g L−1), and mycelium growth (68% of inhibition). Also, Graesiella EPSs acted as a bactericide against Vibrio anguilaruim and Listonella anguilaruim (100% inhibition). EPSs were also found to have potent antioxidant activity compared with L-ascorbic acid. The obtained results open new perspectives to the further exploration of Graesiella sp. as a potential EPS producer, making it a promising candidate for numerous industrial applications.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationGongi, W., Cordeiro, N., Pinchetti, J. L. G., & Ouada, H. B. (2021). Production of exopolymer substances from the thermophilic chlorophyte Graesiella: industrial and ecological applications. Journal of Applied Phycology, 33(1), 343-356.pt_PT
dc.identifier.doi10.1007/s10811-020-02299-7pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3279
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectChlorophyceaept_PT
dc.subjectGraesiella EPSspt_PT
dc.subjectIndustrial applicationspt_PT
dc.subjectEcological applicationspt_PT
dc.subjectBiological activitiespt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleProduction of exopolymer substances from the thermophilic chlorophyte Graesiella: industrial and ecological applicationspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage356pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage343pt_PT
oaire.citation.titleJournal of Applied Phycologypt_PT
oaire.citation.volume33pt_PT
person.familyNamecordeiro
person.givenNamenereida
person.identifier1612636
person.identifier.ciencia-id521A-0F62-EA39
person.identifier.orcid0000-0001-6006-3415
person.identifier.ridO-2253-2019
person.identifier.scopus-author-id7004319456
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication3d02b657-c48c-4f56-813a-1284b81960f3
relation.isAuthorOfPublication.latestForDiscovery3d02b657-c48c-4f56-813a-1284b81960f3

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