Analyzing Pesticide Residues in Lettuce

contributed by Phenomenex | 06/05/2013

Analyzing Pesticide Residues in Lettuce the EN 15662 Method using Phenomenex roQTM QuEChERS Kits Followed by LC/MS/MS and GC/MS Analysis

The European Standard EN 15662 method for pesticide residues in foods is described for the analysis of 25 pesticides and 2 internal standards from lettuce using a Phenomenex roQ QuEChERS EN 15662 Extraction Kit and roQ dSPE Kit for sample preparation. Analysis was performed by LC/MS/MS using a Luna® C18(2) HPLC column and GC/MS using a ZebronTM ZB-5MSi column. The roQ dSPE Kit effectively removed matrix interferences from the lettuce matrix and featured ease of use aspects as compared to other QuEChERS kits including leak-free tubes and user friendly extraction salt packets. Recoveries of all 25 pesticides were between 70 to 120 % with sample-to-sample variability <15 %. The lower limit of quantification (LLOQ) was well below the maximum residue limit reported in the International Maximum Residue Level (MRL) Database, demonstrating excellent performance of the roQ QuEChERS product for food safety testing.

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