Study of Trace Metal (Cr, Mn, Fe, Co, Ni, Cu, Zn and Cd) Composition in Tea Available at Shillong, Meghalaya, India

C. L. Nongpiur; D. F. Diengdoh; E. R. Dkhar; R. Decruse; P. Baruah; D. G. Marbaniang
Tea contain several essential nutrients, drinking of tea is considered beneficial for the human health. The presence of metals in trace concentration in tea has received special attention because they are directly related to health. A study was conducted in some black tea brands and their infusion, sampled from Shillong, the capital city of the state of Meghalaya, India to determine the concentration of Cr, Mn, Fe, Co, Ni, Cu, Zn and Cd in (Camellia sinensis). The study revealed that the mean concentration of Cr in both tea leaves and tea infusion was 0.4 ± 0.2 μgg-1 and 0.2 ± 0.2 μg/150ml respectively, of Mn was 129.5 ± 14.0 μgg-1 and 333.0 ± 44.4 μg/150ml respectively, of Fe was 128.0 ± 7.6 μgg-1 and 65.9 ± 31.0 μg/150ml respectively, of Co was 1.3 ± 0.02 μgg-1 and 1.9 ± 0.3 μg/150ml respectively, of Ni was 1.7 ± 0.7 μgg-1 and 3.2 ± 1.7 μg/150ml respectively, of Cu was 9.0 ± 1.3 μgg-1 and 11.1 ± 2.6 μg/150ml respectively, of Zn was 12.2 ± 2.2 μgg-1 and 16.1 ± 2.4 μg/150ml respectively and of Cd was 0.4 ± 0.1 μgg-1 Keywords -black tea; daily; infusion; intake; metals; toxicity and 0.4 ± 0.1 μg/150ml respectively. Calculation of percentage release was performed, and it was observed that Mn and Ni extractable percentage varies from 30% to 55% whereas the percentages of all the other metals were less than 30%. Daily intake of metals through tea drinking pathway was analyzed and it was seen that the metal intake was less than the acceptable and recommended daily intake of metals.
black tea; daily; infusion; intake; metals; toxicity
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