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Evaluation of the effect of extracted time conditions on the phenolic content of olive pastes from cv. Arbequina and discrimination using a lab-made potentiometic electronic tongue

2021Conference object Open access
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dc.contributor.authorMarx, Ítala
dc.contributor.authorRodrigues, Nuno
dc.contributor.authorVeloso, Ana C.A.
dc.contributor.authorPereira, J.A.
dc.contributor.authorPeres, António M.
dc.date.accessioned2023-02-10T14:27:18Z
dc.date.available2023-02-10T14:27:18Z
dc.date.issued2021
dc.description.abstractThe present study investigated the effect of malaxation times (Mt: 0, 15, 30, 45 and 60 min), during the industrial extraction of cv. Arbequina oils at 25 ºC on total phenolic content and bitterness index of olive pastes. Additionally, the possibility of applying a lab-made potentiometric electronic tongue (E-tongue), comprising 40 lipid/polymer sensor membranes with cross sensitivity, to discriminate the olive pastes according to the Mt, was evaluated. The results pointed out that the olive pastes’ total phenolic contents significantly decreased (P-value < 0.001, one-way ANOVA) with the increase of the Mt (from 2.21±0.02 to 1.99±0.03 g GAE/kg olive paste), being observed a linear decreasing trend (R-Pearson = -0.910). Similarly, the bitterness index also decreased with the Mt (23.4±0.3 to 21.9±0.4 oleuropein/kg olive paste). These findings may be tentatively attributed to the migration of the phenolic compounds from the olive pastes to the extracted oil and water phases, during the malaxation process. Finally, the E-tongue signals, acquired during the analysis of the olive pastes’ methanolic extracts (methanol:water, 80:20 v/v), together with a linear discriminant analysis (LDA), coupled with a simulated annealing (SA) algorithm, allowed to establish a successful classification model. The E-tongue-LDA-SA model, based on 11 selected non-redundant sensors, allowed to correctly discriminate all the studied olive pastes according to the Mt (sensitivities of 100% for training and leave-one-out cross-validation). The satisfactory performance of E-tongue could be tentatively explained by the known capability of lipid/polymeric sensor membranes to interact with phenolic compounds, through electrostatic interactions and/or hydrogen bonds, which total content depended on the Mt.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMarx, Ítala; Rodrigues, Nuno; Veloso, Ana C.A.; Pereira, J.A.; Peres, António M. (2021). Evaluation of the effect of extracted time conditions on the phenolic content of olive pastes from cv. Arbequina and discrimination using a lab-made potentiometic electronic tongue. In The 1st International Electronic Conference on Chemical Sensors and Analytical Chemistry. Onlinept_PT
dc.identifier.urihttp://hdl.handle.net/10198/26886
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectElectronic tonguept_PT
dc.subjectResearch Subject Categories::TECHNOLOGY::Chemical engineeringpt_PT
dc.titleEvaluation of the effect of extracted time conditions on the phenolic content of olive pastes from cv. Arbequina and discrimination using a lab-made potentiometic electronic tonguept_PT
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceOnlinept_PT
oaire.citation.endPage1pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleThe 1st International Electronic Conference on Chemical Sensors and Analytical Chemistrypt_PT
person.familyNameMarx
person.familyNameRodrigues
person.familyNamePereira
person.familyNamePeres
person.givenNameÍtala
person.givenNameNuno
person.givenNameJosé Alberto
person.givenNameAntónio M.
person.identifier1676851
person.identifier107333
person.identifier.ciencia-id2717-C420-DEAE
person.identifier.ciencia-idF41D-B424-5F78
person.identifier.ciencia-id611F-80B2-A7C1
person.identifier.ciencia-idCF16-5443-F420
person.identifier.orcid0000-0002-7049-2114
person.identifier.orcid0000-0002-9305-0976
person.identifier.orcid0000-0002-2260-0600
person.identifier.orcid0000-0001-6595-9165
person.identifier.ridGLV-5485-2022
person.identifier.ridL-6798-2014
person.identifier.ridI-8470-2012
person.identifier.scopus-author-id57191503603
person.identifier.scopus-author-id55258560600
person.identifier.scopus-author-id57204366348
person.identifier.scopus-author-id7102331969
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isAuthorOfPublicationea543e4e-b9e9-45f1-afac-dda52dbf0ab8
relation.isAuthorOfPublication00739d63-995d-4b1f-97d0-03d24c7cf0fd
relation.isAuthorOfPublication7932162e-a2da-4913-b00d-17babbe51857
relation.isAuthorOfPublication7d93be47-8dc4-4413-9304-5b978773d3bb
relation.isAuthorOfPublication.latestForDiscovery7d93be47-8dc4-4413-9304-5b978773d3bb

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