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Iodine and Selenium contents in Portuguese foods as consumed

2017-10Conference object Restricted access
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dc.contributor.authorDelgado, Inês
dc.contributor.authorVentura, Marta
dc.contributor.authorGueifão, Sandra
dc.contributor.authorCoelho, Inês
dc.contributor.authorRego, Andreia
dc.contributor.authorMoreira, Tiago
dc.contributor.authorSanches, Diana
dc.contributor.authorNobre, Daniela
dc.contributor.authorCastanheira, Isabel
dc.date.accessioned2018-02-22T12:46:03Z
dc.date.available2018-02-22T12:46:03Z
dc.date.issued2017-10
dc.description.abstractIntroduction: Selenium and iodine are micronutrients essential for thyroid hormone synthesis and function. There is also some evidence that low plasma selenium and iodine levels increase the risk of autoimmune thyroid diseases. Plasma levels of these oligoelements are related with dietary intake. Since foods are their main natural sources we investigated iodine and selenium content in foods as consumed collected in Portuguese TDS pilot study as representative of diet in the country. Objective: This work aims to evaluate the contents of Se and I in foods collect during the Portuguese Total Diet Study (TDS). Methodology: Samples (n=1020) were collected according to sampling plan from local markets and analyzed as pooled (n=85) of twelve samples each. The iodine and selenium contents were determined using inductively coupled plasma-mass spectrometry (ICP-MS) after alkaline (iodine) or acid (selenium) digestion assisted by microwave. To guarantee the accuracy of the laboratory results matrix matching reference materials and successfully participation in proficiency test schemes were chosen as metrological parameters. The analytical results were expressed by the average of three replicates. Cluster analysis (CA), Principal Component Analysis (PCA) and Spearman correlation were applied to evaluate the statistical significance of analytical data. Main Findings: Selenium content ranged from 109±10.85 μg/100g (fresh tuna) to 1.82±0.16 μg/100g (milk with cereals). Iodine values were found from 157±5.8 μg/100g (cockles and clams) to 0.27±0.014 μg/100g (lupine). CA classified samples into four main groups on the basis of the iodine and selenium content. PCA and CA analysis are in agreement. Spearman positive correlation (p≤ 0.05) was achieved between iodine and selenium contents. Conclusion: Application of chemometric methods to analytical data is useful to group food samples when iodine/selenium ratio is necessary to suppress iodine deficiency.pt_PT
dc.description.sponsorshipThis work was undertaken within Total Diet Study Exposure (www.tds-exposure.eu), which is funded by the European Commission (Grant Agreement 289108).pt_PT
dc.description.versionN/Apt_PT
dc.identifier.urihttp://hdl.handle.net/10400.18/5024
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationTotal Diet Study Exposure
dc.subjectCluster Analysispt_PT
dc.subjectICP-MSpt_PT
dc.subjectIodinept_PT
dc.subjectSeleniumpt_PT
dc.subjectTotal Diet Studypt_PT
dc.subjectPortuguese Dietpt_PT
dc.subjectComposição dos Alimentospt_PT
dc.titleIodine and Selenium contents in Portuguese foods as consumedpt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleTotal Diet Study Exposure
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/289108/EU
oaire.citation.conferencePlaceBuenos Aires, Argentinapt_PT
oaire.citation.title12th International Food Data Conference (IFDC) "From Food Composition to better Policies and Programmes in Nutrition and Agriculture", 11-13 October 2017pt_PT
oaire.fundingStreamFP7
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsclosedAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isProjectOfPublicationcc652884-f79a-4fc2-8134-0cff92709d45
relation.isProjectOfPublication.latestForDiscoverycc652884-f79a-4fc2-8134-0cff92709d45

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