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Toxic and essential mineral elements content of black tea leaves and their tea infusions consumed in Iran.
Biol Trace Elem Res. 2010 Apr; 134(1):109-17.BT

Abstract

The metal contents of eleven black tea samples, four cultivated in Iran and seven imported, and their tea infusions were determined. Twelve elements consisting toxic metals (Al, As, Pb, Cr, Cd, and Ni) and essential mineral elements (Fe, Zn, Cu, Mn, Ca, and Mg) were analyzed using inductively coupled plasma atomic emission spectroscopy (ICP-AES). Al, Ca, Mg, and Mn ranged in black tea leaves at mg g(-1) levels, while Cr, Fe, Ni, Cu, Zn were at microg g(-1) levels. Analysis of variance showed no statistically significant differences among most elements determined in cultivated and imported black teas in Iran except for Ni and Cu. The extraction efficiency of each element into tea infusions was evaluated. The solubility of measured metals in infusion extracts varied widely and ranged from 0 to 59.3%. Among the studied elements, Cr, Pb, and Cd showed the lowest rates of solubility and Ni had the highest rates of solubility. The amount of toxic metals and essential mineral elements that one may take up through consumption of black tea infusion was estimated. The amount of realizing each element into tea infusions and acceptable daily intake, for safety consumption of black tea, was compared.

Authors+Show Affiliations

Environmental Laboratory, Nuclear Science Research School, Nuclear Science & Technology Research Institute, Atomic Energy Organization of Iran (AEOI), P. O. Box 11365-3486, Tehran, Iran. salahinejad@gmail.comNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19609493

Citation

Salahinejad, Maryam, and Fereydoon Aflaki. "Toxic and Essential Mineral Elements Content of Black Tea Leaves and Their Tea Infusions Consumed in Iran." Biological Trace Element Research, vol. 134, no. 1, 2010, pp. 109-17.
Salahinejad M, Aflaki F. Toxic and essential mineral elements content of black tea leaves and their tea infusions consumed in Iran. Biol Trace Elem Res. 2010;134(1):109-17.
Salahinejad, M., & Aflaki, F. (2010). Toxic and essential mineral elements content of black tea leaves and their tea infusions consumed in Iran. Biological Trace Element Research, 134(1), 109-17. https://doi.org/10.1007/s12011-009-8449-z
Salahinejad M, Aflaki F. Toxic and Essential Mineral Elements Content of Black Tea Leaves and Their Tea Infusions Consumed in Iran. Biol Trace Elem Res. 2010;134(1):109-17. PubMed PMID: 19609493.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Toxic and essential mineral elements content of black tea leaves and their tea infusions consumed in Iran. AU - Salahinejad,Maryam, AU - Aflaki,Fereydoon, Y1 - 2009/07/17/ PY - 2009/06/02/received PY - 2009/06/25/accepted PY - 2009/7/18/entrez PY - 2009/7/18/pubmed PY - 2010/5/25/medline SP - 109 EP - 17 JF - Biological trace element research JO - Biol Trace Elem Res VL - 134 IS - 1 N2 - The metal contents of eleven black tea samples, four cultivated in Iran and seven imported, and their tea infusions were determined. Twelve elements consisting toxic metals (Al, As, Pb, Cr, Cd, and Ni) and essential mineral elements (Fe, Zn, Cu, Mn, Ca, and Mg) were analyzed using inductively coupled plasma atomic emission spectroscopy (ICP-AES). Al, Ca, Mg, and Mn ranged in black tea leaves at mg g(-1) levels, while Cr, Fe, Ni, Cu, Zn were at microg g(-1) levels. Analysis of variance showed no statistically significant differences among most elements determined in cultivated and imported black teas in Iran except for Ni and Cu. The extraction efficiency of each element into tea infusions was evaluated. The solubility of measured metals in infusion extracts varied widely and ranged from 0 to 59.3%. Among the studied elements, Cr, Pb, and Cd showed the lowest rates of solubility and Ni had the highest rates of solubility. The amount of toxic metals and essential mineral elements that one may take up through consumption of black tea infusion was estimated. The amount of realizing each element into tea infusions and acceptable daily intake, for safety consumption of black tea, was compared. SN - 1559-0720 UR - https://www.unboundmedicine.com/medline/citation/19609493/Toxic_and_essential_mineral_elements_content_of_black_tea_leaves_and_their_tea_infusions_consumed_in_Iran_ L2 - https://dx.doi.org/10.1007/s12011-009-8449-z DB - PRIME DP - Unbound Medicine ER -