Copper, Manganese, Zinc, and Cadmium in Tea Leaves of Different Types and Origin

Copper, Manganese, Zinc, and Cadmium in Tea Leaves of Different Types and Origin

Concentrations of selected metals (Cu, Mn, Zn, Cd) in tea leaves were investigated. Samples included black, green, and other (red, white, yellow, and oolong) teas. They were purchased on a local market but they covered different countries of origin. Beverages like yerba mate, rooibos, and fruit teas...

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Bibliographic Details
Published in:Biological trace element research Vol. 183; no. 2; pp. 389 - 395
Main Authors: Podwika, W., Kleszcz, K., Krośniak, M., Zagrodzki, P.
Format: Journal Article
Language:English
Published: New York Springer US 01-06-2018
Springer Nature B.V
Subjects:
Absorption spectroscopy
Atomic absorption analysis
Atomic absorption spectroscopy
Beverages
Biochemistry
Biomedical and Life Sciences
Biotechnology
Black tea
Cadmium
Cadmium - analysis
Copper
Copper - analysis
Heavy metals
Leaves
Life Sciences
Manganese
Manganese - analysis
Metal concentrations
Nutrition
Oncology
Plant Leaves - chemistry
Ratios
Spectral analysis
Spectrometry
Tea
Tea - chemistry
Zinc
Zinc - analysis
Tea
Cadmium
AAS
Copper
Zinc
Manganese
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Summary:Concentrations of selected metals (Cu, Mn, Zn, Cd) in tea leaves were investigated. Samples included black, green, and other (red, white, yellow, and oolong) teas. They were purchased on a local market but they covered different countries of origin. Beverages like yerba mate, rooibos, and fruit teas were also included in the discussion. Metal determinations were performed using atomic absorption spectrometry. In black teas, Mn/Cd ratio was found to be significantly higher (48,091 ± 35,436) vs. green (21,319 ± 16,396) or other teas (15,692 ± 8393), while Cd concentration was lower (31.4 ± 18.3 μg/kg) vs. other teas 67.0 (67.0 ± 24.4). Moreover, Zn/Cu and Cu/Cd ratios were, respectively, lower (1.1 ± 0.2 vs. 2.2 ± 0.5) and higher (1086 ± 978 vs. 261 ± 128) when comparing black teas with other teas. Intake of each metal from drinking tea was estimated based on the extraction levels reported by other authors. Contributions to recommended daily intake for Cu, Mn, and Zn were estimated based on the recommendations of international authorities. Except for manganese, tea is not a major dietary source of the studied elements. From the total number of 27 samples, three have shown exceeded cadmium level, according to local regulations.
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ISSN:0163-4984
1559-0720
1559-0720
DOI:10.1007/s12011-017-1140-x