Multiresidue Pesticide Analysis in Fruit and Vegetable Commodities Using both UPLC and APGC on A Single Mass Spectrometer Platform

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Kari Organtini, Simon Hird, Eimear McCall, and Gareth Cleland
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Consumer concerns and federal regulations make pesticide residue analysis an important component of ensuring food safety. It is desirable to rapidly and reliably screen samples for a large number of pesticides in as few methods as possible . Comprehensive pesticide screening is typically performed using both LC-MS and GC-MS techniques on dedicated MS platforms. For this analysis, both UPLC-MS/MS and APGC-MS/MS pesticide residue analysis was performed on a single mass spectrometer, with a changeover time from LC-MS/MS to GC-MS/MS of less than 30 minutes.  The same sample extracts prepared from various fruit and vegetable commodities were run on both chromatography systems that were coupled to the same tandem quadrupole mass spectrometer. Each method targeted a list of approximately 200 compounds each, monitoring for at least two MRM transitions for each compound. Standards for data quality were taken from the SANTE Guidelines (11945/2015). In the four matrices analyzed, >96% of compounds were detected at 10 µg/kg, with a majority of compounds detectable below  1 µg/kg  on both UPLC and APGC. The coefficient of determination on matrix extracted calibration curves were generally > 0.995 and ion ratios fell within 30% of the reference value.  The RSD was < 10% for upwards of 90% of the compounds detected at 10 µg/kg. The data presented demonstrates the ability to increase compound coverage on a single mass spectrometer with the flexibility and reliability of performing UPLC-MS/MS and APGC-MS/MS for routine multiresidue pesticide analysis.

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