Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1148, Issue 2, Pages 152-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2007.03.019
Keywords
microwave-assisted extraction; pesticides; residue; conversion; thiophanate methyl; carbendazim
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Microwave-assisted extraction (MAE) was carried out for the determination of the fungicides thiophanate methyl [1.2-alpha-(3-methoxycarbonyl-2-thioureido)benzene] and carbendazim (methyl benzimidazol-2-ylcarbamate) in vegetable samples. Two vegetable samples, cabbage and tomatoes, were fortified with the two pesticides and subjected to MAE followed by cleanup to remove co-extractives prior to analysis by high-performance liquid chromatography (HPLC). Using the selected microwave exposure time and power setting, the recoveries of carbendazim, ranged from 69 to 75%. But thiophanate methyl could not be recovered as the parent compound. It was converted and recovered as carbendazim. The conversion was quantitative as confirmed by high-performance liquid chromatography-mass spectrometry (HPLC-MS). (C) 2007 Elsevier B.V. All rights reserved.
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