Achieving method reliability in the routine determination of anionic polar pesticides in food, without derivatization

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Euan Ross,1 JD De Alwis, Stuart Adams, Dimple Shah, Simon Hird
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Interest in the direct determination of highly This poster presented for NACRW foodstuffs has noticeably increased over the last five years, driven by the potential safety concerns of the herbicide, glyphosate.  As a result, routine testing labs strive to achieve efficient and reliable methodology to meet the demands of increased surveillance and brand protection. Whilst there have been many methodology advances enabling direct analysis in previous years, many of the solutions require the need for specialized LC equipment or the highest performing MS systems to ensure reliable and accurate determination of residues.   

In this work, we explore the importance of chromatographic retention and separation of these highly polar analytes to achieve method reliability and overcome the renowned challenges of this analysis.  Representative commodities (including samples of cereals, fruits and vegetables) were purchased from local retail outlets and prepared for the determination of anionic polar pesticides using the Quick Polar Pesticides (QuPPe) extraction procedure.  A panel of representative anionic polar pesticides, including aminomethylphosphonic acid (AMPA), glufosinate and glyphosate were targeted using a LC-MS/MS method.   

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