Multiresidue Analysis Method for Determination of Unregistered Organophosphorus Pesticides in Korea for Imported Agri-Food

Abstract

BACKGROUND:For safety evaluation of imported agri-food in Korea, the multiresidue analysis method was establised for unregistered organophosphorus pesticides, aspon, chlorthion, chlorthiophos, crotoxyphos, demeton-O, demeton-S, demeton-S-methyl, dioxathion, heptenophos, iodofenphos, leptophos, methyl-trithion, propetamphos and sulfotep. METHODS AND RESULTS: The used method for multiresidue analysis in brown rice and orange used as representative samples of imported agri-food was the official method of Korean Food and Drug Administration. The results of validation test of 13 organophosphorus pesticides except crotoxyphos for multiresidue analysis method are compared to the criteria such as specificity, linearity, accuracy, precision and limit of quantification. CONCLUSION: The used method for multiresidue analysis of unregistered 13 organophosphorus pesticides except crotoxyphos in Korea can surely be used as an official method for routine analysis of imported agri-food.

Liquid Chromatography-Tandem Mass Spectrometry for the Simultaneous Analysis of 353 Pesticides in the Edible Insect Tenebrio molitor Larvae (Mealworms)

“…Molecules 2020, 25, x FOR PEER REVIEW 4 of 25 26 showed changes in recovery rate between the trials (Table S2), and 10 showed a large recovery difference greater than 25% between N = 1 and N = 3 ( Figure 1), with values of 20-62% for N = 1 and 74-90% for N = 3. These pesticides have a large partition coefficient (P) with a log P value of 3.1-6.0 and are relatively more non-polar than others [34,35]. Therefore, partitioning with N > 1 is essential.…”

“…The reason for the low recovery (<30%) of pesticides at N = 3 (Table 1) is dSPE cleanup with PSA rather than acetonitrilehexane partitioning (Table 2). Recovery and partition coefficient (P) [34,35] of 10 representative pesticides that showed a large recovery difference greater than 25% between N = 1 and N = 3. The error bar is the standard deviation of recovery rate (n = 3).…”

“…Together with the results in Section 2.1.2., we verified that citrate buffer without acid was more effective in the mealworm sample matrices. As a result, the [34,35] of 10 representative pesticides that showed a large recovery difference greater than 25% between N = 1 and N = 3. The error bar is the standard deviation of recovery rate (n = 3).…”

“… Recovery and partition coefficient (P) [ 34 , 35 ] of 10 representative pesticides that showed a large recovery difference greater than 25% between N = 1 and N = 3. The error bar is the standard deviation of recovery rate ( n = 3).…”