An EPR study on tea: Identification of paramagnetic species, effect of heat and sweeteners

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dc.contributor.authorBıyık, Recep
dc.contributor.authorTapramaz, Recep
dc.contributor.authorID0000-0001-7929-4395tr_TR
dc.contributor.departmentTAEK-ÇNAEMtr_TR
dc.date.accessioned2018-11-27T11:40:14Z
dc.date.available2018-11-27T11:40:14Z
dc.date.issued2009-10
dc.description.abstractTea (Camellia Sinensis) is the most widely consumed beverage in the world, and is known to be having therapeutic, antioxidant and nutritional effects. Electron paramagnetic resonance (EPR) spectral studies made on the tea cultivated along the shore of Black Sea, Turkey, show Mn2+ and Fe3+ centers in green tea leaves and in black tea extract. Dry black tea flakes and dry extract show additional sharp line attributed to semiquinone radical. The origins of the paramagnetic species in black tea are defined and discussed. Effect of humidity and heat are investigated. It is observed that dry extract of black tea melts at 100 ◦C and the semiquinone radical lives up to 140 ◦C while Mn2+ sextet disappears just above 100 ◦C in tea extract. Natural and synthetics sweeteners have different effects on the paramagnetic centers. White sugar (sucrose) quenches the Mn2+ and semiquinone lines in black tea EPR spectrum, and glucose, fructose, lactose and maltose quench Fe3+ line while synthetic sweeteners acesulfam potassium, aspartame and sodium saccharine do not have any effect on paramagnetic species in tea.tr_TR
dc.identifier.citationRecep, B. ve Recep T. (2009). An EPR study on tea: Identification of paramagnetic species, effect of heat and sweeteners. Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy, 74 (2009), 767–770.tr_TR
dc.identifier.endpage770tr_TR
dc.identifier.issn1386-1425tr_TR
dc.identifier.issue3tr_TR
dc.identifier.startpage767tr_TR
dc.identifier.urihttp://kurumsalarsiv.tenmak.gov.tr/handle/20.500.12878/987
dc.identifier.volume74tr_TR
dc.language.isoengtr_TR
dc.publisherElseviertr_TR
dc.relation.isversionofhttps://doi.org/10.1016/j.saa.2009.08.014tr_TR
dc.relation.journalSpectrochimica Acta Part A: Molecular and Biomolecular Spectroscopytr_TR
dc.rightsinfo:eu-repo/semantics/openAccesstr_TR
dc.subjectTeatr_TR
dc.subjectÇaytr_TR
dc.subjectCatechintr_TR
dc.subjectKatekintr_TR
dc.subjectSweetenertr_TR
dc.subjectTatlandırıcıtr_TR
dc.subjectAntioxidanttr_TR
dc.subjectAntioksidantr_TR
dc.subjectSemiquinonetr_TR
dc.subjectSemikuinontr_TR
dc.subjectMetal complextr_TR
dc.subjectMetal kompleksitr_TR
dc.subjectEPRtr_TR
dc.titleAn EPR study on tea: Identification of paramagnetic species, effect of heat and sweetenerstr_TR
dc.typearticletr_TR
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