Glyphosate and glufosinate are non-selective herbicides that have been extensively used worldwide. Their ionic and water-soluble characteristics often make it difficult to analyze them, especially in food components. A method was developed in this study for the simultaneous analysis of glyphosate, glufosinate, and three metabolic products in beer, barley tea, and their ingredients (malt and corn). The analytical samples were extracted with H2O, purified with a strong anion-exchange solid-phase extraction (SPE) cartridge, and then analyzed by liquid chromatography tandem mass spectrometry (LC-MS/MS) with an anion-exchange high-performance liquid chromatography (HPLC) column. This method enabled a rapid and sensitive analysis [limit of quantification (LOQ) = 10 µg/kg] of the herbicides to be achieved.
Paraquat and diquat are fast-acting herbicides that have been used worldwide. While they might pose food safety risks, their extremely basic and polar properties make it difficult to sensitively analyze these herbicides in food components. In the present study, a rapid and sensitive analysis (LOQ=10 µg/kg) of beer and malt samples using LC-MS/MS was performed under ion pair chromatography conditions. Samples were prepared by extraction with dilute HCl and purification with a weak cation exchange SPE cartridge.
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