Nour Suheir M F, El-Desoky Amany M M, Hassan Nagla A, Osman Khaled A
Department of Economic Home, Faculty of Agriculture, Alexandria University, P.O Box 21545, Al-Shatby, Alexandria, Egypt.
Department of Pesticide Chemistry and Technology, Faculty of Agriculture, Alexandria University, Aflatoon St., P.O Box 21545, EL-Shatby, Alexandria, 21545 Egypt.
J Food Sci Technol. 2023 Feb;60(2):666-678. doi: 10.1007/s13197-022-05652-5. Epub 2022 Dec 6.
This study aimed to determine the levels of epichlorohydrin (ECH) and some metals in 3 brands of bagged and loose black teas which are widely marketed in Alexandria markets, Egypt, and estimate the acceptable daily intake as a safety indicator. Gas chromatography-mass spectrometry results revealed that ECH levels significantly differed between the tested brands steeped for 2 min and tea bags contained higher levels than in loose teas and the levels increased by increasing the steep time. These levels of ECH in all the tested brands either in tea bags or loose teas were higher than the guideline value of 0.10 μg/L. Also, the results illustrated that the adding of sucrose or washing of bags with deionized water for 1 min significantly decreased the levels of ECH. In addition, inductively coupled plasma optic emission spectrometry (ICP-OES) results illustrated that the levels of Al, Pb, and Cd were too low in infusions compared to the established guidelines. Because of the high consumption of tea in Alexanria city, Egypt, it is necessary to determine the contribution of tea to the daily dietary intake of ECH, Al, Pb and Cd. In case of the bagged teas, the calculated daily intake of ECH was on average about 55.37 times greater than that in loose teas. The consumption of both bagged and loose teas infusion could not pose a risk for population as the health hazard index was < 1. It can be concluded that consumers who prefer to use tea bags should rinse these bags before preparing the tea brewer, and do not increase the steeping time to more than 2 min.
本研究旨在测定在埃及亚历山大市场广泛销售的3个品牌的袋装和散装红茶中环氧氯丙烷（ECH）及某些金属的含量，并估算其每日可接受摄入量作为安全指标。气相色谱 - 质谱分析结果显示，浸泡2分钟的受试品牌之间ECH含量存在显著差异，茶包中的含量高于散装茶，且浸泡时间延长含量增加。所有受试品牌的茶包或散装茶中的这些ECH含量均高于0.10μg/L的指导值。此外，结果表明添加蔗糖或用去离子水冲洗茶包1分钟可显著降低ECH含量。另外，电感耦合等离子体发射光谱法（ICP - OES）结果表明，与既定指导方针相比，浸泡液中铝、铅和镉的含量过低。由于埃及亚历山大市茶叶消费量高，有必要确定茶叶对ECH、铝、铅和镉每日膳食摄入量的贡献。就袋装茶而言，计算得出的ECH每日摄入量平均比散装茶约高55.37倍。袋装和散装茶浸泡液的消费对人群不会构成风险，因为健康危害指数<1。可以得出结论，喜欢使用茶包的消费者在准备泡茶器之前应冲洗这些茶包，且浸泡时间不要超过2分钟。
