Comparison of the Level of Boron Concentrations in Black Teas with Fruit Teas Available on the Polish Market

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Authors

ZIOLA-FRANKOWSKA Anetta FRANKOWSKI Marcin NOVOTNÝ Karel KANICKÝ Viktor

Year of publication 2014
Type Article in Periodical
Magazine / Source The Scientific World Journal
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.1155/2014/898425
Field Analytic chemistry
Keywords Boron; Black tea; ICP-OES; daily intake of boron
Description The determination of boron by inductively coupled plasma-atomic emission spectrometry has been carried in water-soluble and acid soluble (total content) fractions of 36 samples of traditional black tea and fruit brew. The estimation of the impact of the type of tea on the concentration of boron in water-soluble and acid extracts and potential human health risk from the daily intake of boron was carried out in this study. The levels of boron differed significantly in black and fruit tea types. The mean total content of boron ranged from 8.31 to 18.40 mg/kg in black teas, from 12.85 to 15.13 mg/kg in black tea with fruit flavor, and from 12.09 to 22.77 mg/kg in fruit brews. The degree of extraction of boron in black tea ranged from 8% to 27% and for fruit tea from 17% to 69%. In addition, the values below 25% were of black teas with fruit flavors. The daily intake of B from tea infusions (three cups/day) is still within the average daily intake except for some of the fruit brews which exceed acceptable regulations of the daily intake of total boron by humans. Hence, it may not produce any health risks for human consumption, if other sources of metal contaminated food are not taken at the same time.
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