Metal concentrations in traditional and herbal teas and their potential risks to human health
| Autor: | Yungen Liu, Evandro B. da Silva, Peng Gao, Lena Q. Ma, Letuzia M. de Oliveira, Julia Gress, Suchismita Das |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
chemistry.chemical_element Food Contamination 010501 environmental sciences Risk Assessment complex mixtures 01 natural sciences Dietary Exposure Human health Herbal tea Humans Soil Pollutants Environmental Chemistry Medicine Camellia sinensis Medicinal plants Waste Management and Disposal Black tea 0105 earth and related environmental sciences Cadmium Beverage consumption Traditional medicine business.industry 010401 analytical chemistry food and beverages Pollution 0104 chemical sciences chemistry Metals business Teas Herbal Food contaminant |
| Zdroj: | Science of The Total Environment. 633:649-657 |
| ISSN: | 0048-9697 |
| Popis: | Food and beverage consumption is an important route for human exposure to metals. Traditional tea (Camellia sinensis) is a widely-consumed beverage, which may contain toxic metals. This study determined total and infusion concentrations of 5 metals including Al, As, Cd, Cr, and Pb in 47 traditional and herbal teas from 13 countries and assessed their potential risks to human health. The data showed that herbal teas exhibited higher As (0.26mgkg-1), Cd (0.19mgkg-1) and Pb (2.32mgkg-1) than traditional teas. Black tea from India had high Cr at 31mgkg-1 while white tea from China had low Cr at 0.39mgkg-1. Arsenic, Cd and Pb did not exceed the WHO limit for medicinal plants excluding one herbal tea with 1.1mgkg-1 As and 26.4mgkg-1 Pb. However, Cr in 47% herbal teas and 73% traditional teas exceeded the Canada limit of 2mgkg-1. Metal concentrations in tea infusions were below the MCL for drinking water except for Al. Total Al and its infusion was lower in herbal teas (47-1745mgkg-1 and 0.09-3.95mgL-1) than traditional teas (50.3-2517mgkg-1 and 0.02-7.51mgL-1), with 0.9-22% and 4-49% of the Al being soluble in infusion. The Al concentrations in infusion in all black tea and 83, 75 and 25% of the green, oolong and herbal teas exceeded the secondary MCL for drinking water at 0.2mgL-1. However, the weekly intake of Al from drinking tea (0.001-0.39 and 0.003-0.56mgkg-1 for children and adults) was lower than the provisional tolerable weekly intake for Al at 1.0mgkg-1. Our data showed that it is important to consider metal intake from tea consumptions, especially for Cr and Al in heavy tea drinkers. |
| Databáze: | OpenAIRE |
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