期刊
FOOD CHEMISTRY
卷 143, 期 -, 页码 405-410出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2013.08.027
关键词
Benzoylurea pesticides; Oolong tea; HPLC-MS/MS; Solid phase extraction; Infusion of tea
资金
- NSFC [41240035]
- Fujian Provincial Department of Science and Technology [2012J01035, 2011Y0016]
- Ministry of Education, Science and Technology Development Center [20123514110001]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1116]
- National Key Technologies R & D Program of China during the 12th Five-Year Plan Period [2012BAD29806]
- Fujian Provincial Bureau of Quality and Technical Supervision [FJQI2009007]
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.
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