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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• 作者：Lei Chen ; JinFa Chen ; Ying Guo ; JianRong Li ; YiQiang Yang ; LiangJun Xu ; FengFu Fu
• 关键词：Benzoylurea pesticides ; Oolong tea ; HPLC&ndash ; MS/MS ; Solid phase extraction ; Infusion of tea
• 刊名：Food Chemistry
• 出版年：2014
• 出版时间：15 January, 2014
• 年：2014
• 卷：143
• 期：Complete
• 页码：405-410
• 全文大小：436 K

文摘

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.