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Characterization of biodegradable films based on extracellular polymeric substances extracted from the thermophilic microalga Graesiella sp

2022Journal article Open access
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dc.contributor.authorGongi, Wejdene
dc.contributor.authorPinchetti, Juan Luis Gómez
dc.contributor.authorCordeiro, Nereida
dc.contributor.authorSadok, Saloua
dc.contributor.authorOuada, Hatem Ben
dc.date.accessioned2022-02-10T11:11:50Z
dc.date.available2022-02-10T11:11:50Z
dc.date.issued2022
dc.description.abstractIn this research, a new type of biodegradable film based on the extracellular polymeric substances (EPS) and isolated from the thermophilic microalga Graesiella sp., was formulated and characterized. The EPS film was 0.221 mm thick. Atomic force microscopy and scanning electron microscopy images revealed a homogeneous character with a lamellar microstructure. The EPS film displayed yellowish color, high transparency, high ul traviolet barrier properties, and low oxygen (0.008 SI), and water-vapor permeability (0.037 SI). Film tensile strength (16.24 MPa) and elongation at break (4.76%) were in the range of common biofilms and the thermal analyses showed high transition temperature (126 ◦C) and high thermal stability (up to 800 ◦C). Compared to ascorbic acid, results indicated that the EPS film shows a higher antioxidant activity, mainly as β-carotene anti bleaching (84%), DPPH- free radical scavenging ability (80%), and ferrous iron-chelating (55%). Graesiella sp., EPS film effects on beef meat packaging were studied during nine days of cold storage. Compared to polyvinylchloride-packed meat, EPS-packed meat samples showed higher stability of color (redness = 13.6) and pH (5.85) during storage and low proliferation of total viable counts (4.04 CFU⋅g− 1 ) and Pseudomonas bacteria (4.09 CFU⋅g− 1 ). They also exhibit lower drip loss (9%) and less metmyoglobin (32%), heme iron (4.87 μg⋅g− 1 ) total volatile basic nitrogen (TVB-N = 22.96 mg⋅kg− 1 ), and lipid oxidation (MDA = 0.025 mg⋅kg− 1 ). The obtained results highlight the potential for use of microalgae EPS as a new film forming material that could be applied in beef meat preservation.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationGongi, W., Pinchetti, J. L. G., Cordeiro, N., Sadok, S., & Ouada, H. B. (2021). Characterization of biodegradable films based on extracellular polymeric substances extracted from the thermophilic microalga Graesiella sp. Algal Research, 102565.pt_PT
dc.identifier.doi10.1016/j.algal.2021.102565pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4072
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectGraesiella sp.pt_PT
dc.subjectEPS filmpt_PT
dc.subjectPhysicochemical propertiespt_PT
dc.subjectAntioxidantpt_PT
dc.subjectMeat shelf lifept_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleCharacterization of biodegradable films based on extracellular polymeric substances extracted from the thermophilic microalga Graesiella sppt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage102565pt_PT
oaire.citation.titleAlgal Researchpt_PT
oaire.citation.volume61pt_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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