Determination of Pyrethroids in Apples and Cabbages by QuEChERS-HPLC-MS/MS
A detection method for five pyrethroids in apple and cabbage samples was established by using QuEChERS combined with high performance liquid chromatography-tandem mass spectrometry(HPLC-MS/MS).The conditions of chromatography-mass spectrum were optimized according to the mass spectro-metric fragmentation patterns of pyrethroids.Besides,the average recovery under different salting-out a-gents,buffering systems and purification agents were investigated,and the QuEChERS pretreatment method was optimized.The results showed that the method could complete the determination of per-methrin,fenvalerate,fenpropathrin,deltamethrin and cypermethrin in 9 minutes.The linear relationship between the five targets was good in their respective linear ranges(R2≥0.995),the limit of detection(LOD)was 0.05～1.0 μg/kg,and the limit of quantitation(LOQ)was 0.1～2.0 µg/kg.The recovery effect(RE)of the five targets under the three addition levels of 10,50 and 100 μ.g/kg was 81.6％～103.4％and the matrix effect(ME)was 75.9％～97.8％.The intra-day and inter-day precision was in the range of 2.62％～13.20％.This method is sensitive,wide linear range,green safety,which is suit-able for the routine inspection and residue detection of pyrethroids in apple and cabbage samples.
pyrethroidsQuEChERSHPLC-MS/MSfruits and vegetables
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