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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Renée Street & Jiřina Száková & Ondřej Drábek & Lenka Mládková, 2006. "The status of micronutrients (Cu, Fe, Mn, Zn) in tea and tea infusions in selected samples imported to the Czech Republic," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 24(2), pages 62-71.
    • Handle: RePEc:caa:jnlcjf:v:24:y:2006:i:2:id:3301-cjfs
    DOI: 10.17221/3301-CJFS
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    Cited by:

    1. K. Břendová & P. Tlustoš & J. Száková, 2015. "Biochar immobilizes cadmium and zinc and improves phytoextraction potential of willow plants on extremely contaminated soil," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 61(7), pages 303-308.
    2. T. Veselý & P. Tlustoš & J. Száková, 2011. "Organic salts enhanced soil risk elements leaching and bioaccumulation in Pistia stratiotes," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 57(4), pages 166-172.
    3. Veronika ZEMANOVÁ & Kateřina BŘENDOVÁ & Daniela PAVLÍKOVÁ & Pavla KUBÁTOVÁ & Pavel TLUSTOŠ, 2017. "Effect of biochar application on the content of nutrients (Ca, Fe, K, Mg, Na, P) and amino acids in subsequently growing spinach and mustard," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 63(7), pages 322-327.

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