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QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) method has been a lot of researchfor pesticide analysis, because it is very simple and fast. However, this method requires high sensitivityinstrument such as LC-MS/MS because of the use of small sample volume and many impurities compared tothe conventional method. So, QuEChERS method needs to be modified for using with HPLC and GC-ECD/NPD. The aim of this work was to study the application of the QuEChERS method as well as itsmodification for the extraction and preconcentration of 5 groups of 61 pesticides from 4 fruits prior to theirdetermination by HPLC-PDA, GC-ECD/NPD, and LC-MS/MS. The method was validated using spikinglevels at 0.1 mg/kg (or 0.01 mg/kg) in apple, grapes, pear and persimmon. The average recovery byQuEChERS AOAC Official 2007. 01 version using the LC-MS/MS varied from 71.1127.4% for 61pesticides. The average recovery rates using modified QuEChERS varied from 70.9~126% for 61 pesticidesby HPLC-PDA and GC-ECD/NPD. The results satisfied the criteria of multiple pesticide residue analysis,setting 70~130% for recovery rates and below 30% for CV.Key words QuEChERS, Residual Pesticides, HPLC-UVD, GC-ECD/NPD

Modified QuEChERS Multi-Residue Analysis Method for 61 pesticides in Fruits using with HPLC and GC-ECD/NPD