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首页> 外文期刊>Journal of Food Composition and Analysis >Rare earth elements in Oolong tea and their human health risks associated with drinking tea
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Rare earth elements in Oolong tea and their human health risks associated with drinking tea

机译：乌龙茶中的稀土元素及其与喝茶有关的人体健康风险

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In this study, the content of rare earth oxides (REOs) in made teas and infusions of 57 Oolong tea samples was investigated because when compared to other teas, Oolong tea is believed to contain a higher amount of REOs. The risks of REOs in Oolong tea to human health arising from drinking tea were assessed. The content of rare earth oxides (Sigma REOs) in the various types of Oolong tea varied from 0.62 to 10.1 mg/kg, 71.9-79.6% of which consisted of Ce, La, Y, and Nd. One-time infusion and five times successive infusions resulted in leached rates of 9.86-17.4% and 25.8-32.6% of the total REOs, respectively. The leached REOs increased with TOC in tea infusions. The proposed DAI(tea) (daily allowable intake, 42 mu g) would be exceeded when the content of REOs in Oolong tea was greater than 6.84 mg/kg based on the calculation with the highest consumption rate of Oolong tea (15 g/day) and the highest leached rate (41.0%). Among the tea samples studied, only 1.8% of the samples exhibited an REO content. of greater than 6.84 mg/kg. Thus, in general, the intake of REOs by drinking Oolong tea is negligible. (C) 2015 Elsevier Inc. All rights reserved.
机译：在这项研究中，对57杯乌龙茶样品和浸泡茶中的稀土氧化物（REOs）含量进行了研究，因为与其他茶相比，乌龙茶被认为含有较高的REOs。评估了乌龙茶中REO对饮茶引起的人体健康的风险。各种乌龙茶中稀土氧化物（Sigma REOs）的含量在0.62至10.1 mg / kg之间，其中71.9-79.6％由Ce，La，Y和Nd组成。一次输注和五次连续输注导致浸出率分别为总REO的9.86-17.4％和25.8-32.6％。茶浸液中浸出的REO随着TOC的增加而增加。根据乌龙茶最高消费量（15克/天）的计算，当乌龙茶中REO的含量大于6.84 mg / kg时，将超过建议的DAI（茶）（每日允许摄入量，42克）。 ）和最高浸出率（41.0％）。在所研究的茶样品中，只有1.8％的样品显示REO含量。大于6.84 mg / kg。因此，一般而言，喝乌龙茶对REO的摄入量可以忽略不计。 （C）2015 Elsevier Inc.保留所有权利。

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