[Comparison of Validation Results Obtained by GC-MS/MS and LC-MS/MS for the Analysis of Residual Pesticides in Agricultural Products]

[Simultaneous Determination of Pesticide Residues in Brown Rice Using GC-MS/MS and LC-MS/MS]

This study developed a method that simultaneously detected 283 pesticide residues in brown rice using GC-MS/MS and LC-MS/MS. In this method, we examined the desirable amount of sodium chloride required for salting out and the SPE cartridge required for clean-up. Pesticide residues from the sample were extracted with acetonitrile using a homogenizer and mixed with salts including anhydrous magnesium, two types of citrate, and sodium chloride. The sample solution of the acetonitrile layer was cleaned up using the GCB/NH2 (200 mg/200 mg, 6 mL) SPE cartridge. The determination method was validated using two concentrations (0.01 and 0.1 μg/g) of 283 pesticides based on the validation guideline of the Ministry of Health, Labor and Welfare in Japan. Of the 283 pesticides, 250 were detected satisfactorily. In addition, 59 brown rice samples sold in Tokyo were surveyed using the same method. Out of 44 samples, 12 pesticide residues below MRLs were detected. Therefore, this developed method is useful for the simultaneous determination of pesticide residues in brown rice.

[Usefulness of Dilution for Rapid Simultaneous Determination of Residual Pesticides in Edamame (Immature Soybeans) by LC-MS/MS]

A rapid, easy and versatile, simultaneous analytical method by LC-MS/MS based on extraction of QuEChERS method (EN 15662:2008) was developed for the determination of residual pesticides in Edamame (immature soybeans). In this method, it allowed to prepare a test solution only dilution without purification using solid column. As a result, 202 analytes met the management criteria of the guideline for validity assessment (Ministry of Health, Labour and Welfare of Japan). Thus, the present method could be useful for a rapid simultaneous determination of residual pesticides in green soybean.