The status of micronutrients (Cu, Fe, Mn, Zn) in tea and tea infusions in selected samples imported to the Czech Republic

Renée Street, Jiřina Száková, Ondřej Drábek and Lenka Mládková
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Renée Street: Department of Soil Science and Geology and
Jiřina Száková: Department of Agrochemistry and Plant Nutrition, Faculty of Agrobiology, Food and Natural Resources, Czech University of Agriculture in Prague, Prague, Czech Republic
Ondřej Drábek: Department of Soil Science and Geology and
Lenka Mládková: Department of Soil Science and Geology and

Czech Journal of Food Sciences, 2006, vol. 24, issue 2, 62-71

Abstract: A total of 30 tea samples of different origins, thirteen green tea samples, thirteen black tea samples, two semi-fermented tea samples and one white tea, imported to the Czech Republic, were collected and analysed for the total content of copper, iron, manganese, and zinc in tea leaves and tea infusions. The total contents of metals in tea leaves differ according to the type of tea (green or black) and are probably influenced by many other factors, e.g. soil properties. The total contents of Mn were much higher compared to the total contents of Cu, Fe, and Zn, and varied between 511-2220 mg/kg. To compare easily hot water soluble concentrations of Cu, Fe, Mn and Zn, 5 min, 60 min, and 24 h infusions were prepared. The extractability of the elements was in the order Cu > Zn > Mn > Fe. The proportions of the element contents in the infusion related to the respective total contents in leaves were 30 ± 16% Cu, 26 ± 10% Zn, 18 ± 10% Mn, and 1.5 ± 0.8% Fe, respectively. The results confirmed that tea infusion can be an important dietary source of Mn.

Keywords: tea; tea infusion; copper; iron; manganese; zinc; nutrient status (search for similar items in EconPapers)
Date: 2006
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:24:y:2006:i:2:id:3301-cjfs

DOI: 10.17221/3301-CJFS

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Czech Journal of Food Sciences is currently edited by Ing. Zdeňka Náglová, Ph.D.

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