利用微波辅助萃取法测定蔬菜样品中的甲基硫菌灵和多菌灵残留量。
Determination of thiophanate methyl and carbendazim residues in vegetable samples using microwave-assisted extraction.
作者信息
Singh Shashi B, Foster Gregory D, Khan Shahamat U
机构信息
Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi 12, India.
出版信息
J Chromatogr A. 2007 May 4;1148(2):152-7. doi: 10.1016/j.chroma.2007.03.019. Epub 2007 Mar 15.
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).
采用微波辅助萃取（MAE）法测定蔬菜样品中的杀菌剂甲基硫菌灵[1.2-α-（3-甲氧基羰基-2-硫脲基）苯]和多菌灵（甲基苯并咪唑-2-基氨基甲酸酯）。向两种蔬菜样品（卷心菜和西红柿）中添加这两种农药，然后进行微波辅助萃取，接着进行净化以去除共萃取物，再通过高效液相色谱法（HPLC）进行分析。在选定的微波照射时间和功率设置下，多菌灵的回收率在69%至75%之间。但甲基硫菌灵无法以母体化合物形式回收，它会转化为多菌灵并被回收。高效液相色谱-质谱联用仪（HPLC-MS）证实这种转化是定量的。
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