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dc.contributor.authorBrzezicha-Cirocka, Justyna
dc.contributor.authorGrembecka, Małgorzata
dc.contributor.authorCiesielski, Tomasz Maciej
dc.contributor.authorFlaten, Trond Peder
dc.contributor.authorSzefer, Piotr
dc.date.accessioned2017-11-06T08:10:29Z
dc.date.available2017-11-06T08:10:29Z
dc.date.created2016-10-12T12:57:46Z
dc.date.issued2016
dc.identifier.citationBiological Trace Element Research. 2016, 176 429-441.nb_NO
dc.identifier.issn0163-4984
dc.identifier.urihttp://hdl.handle.net/11250/2464105
dc.description.abstractThe aim of this study was to evaluate the elemental composition of black tea samples and their infusions in view of their geographical origin. In total, 14 elements were analyzed, 13 (Ca, K, Mg, Na, Mn, Fe, Zn, Cu, Cr, Ni, Co, Cd, and Pb) by flame atomic absorption spectrometry, and P by UV-Vis spectrometry, after mineralization of samples. It was found that K was the most abundant macroelement in the analyzed samples, whereas among microelements, the highest concentration was found for Mn. Based on the obtained data, the percentage of elements leached into the infusions as well as the daily elemental intake from tea were calculated. The daily intake from tea was compared to the recommended daily allowances (RDAs), and the highest percentages of the RDAs were found for Mn (15 %) and Co (10 %). To study the relations between elemental composition and country of origin of samples, factor analysis and cluster analysis were applied. These multivariate techniques proved to be efficient tools able to differentiate samples according to their provenance as well as plantation within the common regions.nb_NO
dc.language.isoengnb_NO
dc.publisherSpringer Verlagnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleEvaluation of Macro- and Microelement Levels in Black Tea in View of Its Geographical Originnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber429-441nb_NO
dc.source.volume176nb_NO
dc.source.journalBiological Trace Element Researchnb_NO
dc.identifier.doi10.1007/s12011-016-0849-2
dc.identifier.cristin1391204
dc.description.localcode© The Author(s) 2016. Open access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/)nb_NO
cristin.unitcode194,66,10,0
cristin.unitcode194,66,25,0
cristin.unitnameInstitutt for biologi
cristin.unitnameInstitutt for kjemi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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