Study on the simultaneous determination of seven benzoylurea pesticides in Oolong tea and their leaching characteristics during infusing process by HPLC-MS/MS
Study on the simultaneous determination of seven benzoylurea pesticides in Oolong tea and their leaching characteristics during infusing process by HPLC-MS/MS
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HPLC-MS/MS同时测定乌龙茶中7种苯甲酰脲类农药及其冲泡过程的浸出特性研究
DOI：
10.1016/j.foodchem.2013.08.027
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发表时间：
2014-01-15
期刊：
影响因子：
8.8
通讯作者：
Fu, FengFu
中科院分区：
文献类型：
--
作者：
Chen, Lei;Chen, JinFa;Fu, FengFu
建立了同时测定乌龙茶及其冲剂中氯氟脲、二氟苯脲、氟脲、氟虫腈、六氟脲、对氟苯脲和三氟脲7种苯甲脲类农药的方法。该方法的检出限为0.03 ~ 1.00 ng/mL，对泡茶和泡茶液的回收率分别为90.4 ~ 103%和90.3 ~ 102%。利用该方法研究了上述7种农药在浸渍过程中的淋滤特性。实验结果表明：(1)注射过程中最容易提取二氟脲，其次是三氟脲、四氟脲、六氟脲、氯氟脲、氟虫腈和氟脲。(2)氟虫腈和氯虫腈在浸渍过程中的浸出似乎只受溶解度的控制，而其他5种苯甲脲类杀虫剂的浸出主要受其在泡茶和热水之间的分配系数的控制。本研究结果有助于乌龙茶安全性的准确评价。(C) 2013 Elsevier Ltd.版权所有。
A method for the simultaneous determination of 7 benzoylurea pesticides (chlorfluazuron, diflubenzuron, fluazuron, flufenoxuron, hexaflumuron, teflubenzuron and triflumuron) in the manufactured Oolong tea leaves and its infusion was described. The method has a LOD of 0.03-1.00 ng/mL, a recovery of 90.4-103% for made tea and 90.3-102% for tea-infused liquid, respectively. By using the proposed method, the leaching characteristics of above 7 pesticides during infusing process were investigated. The experimental results revealed that: (1) diflubenzuron can be most easily extracted out during infusing process, followed by triflumuron, teflubenzuron, hexaflumuron, chlorfluazuron, flufenoxuron and fluazuron. (2) The leaching of flufenoxuron and chlorfluazuron during infusing process seems to be controlled by only their solubility, whereas, the leaching of other 5 benzoylurea insecticides was primarily controlled by their partitioning coefficient between made tea and hot water. The results of this study are helpful for the accurate evaluation of the safety of Oolong tea. (C) 2013 Elsevier Ltd. All rights reserved.