Establishment of Pre-Harvest Residue Limits (PHRLs) of Fluopicolide and Metrafenone in Cherry Tomato (Lycopersicon esculentum Mill.)
2015
Hur, K.J., Kangwon National University, Chuncheon, Republic of Korea | Woo, M.J., Kangwon National University, Chuncheon, Republic of Korea | Kim, J.Y., Kangwon National University, Chuncheon, Republic of Korea | Saravanan, M., Kangwon National University, Chuncheon, Republic of Korea | Kwon, C.H., Ministry of Food and Drug Safety, Chungju, Republic of Korea | Son, Y.W., Ministry of Food and Drug Safety, Chungju, Republic of Korea | Hur, J.H., Kangwon National University, Chuncheon, Republic of Korea
BACKGROUND: The present investigation was aimed to predict the pre-harvest residue limits (PHRLs) of the fluopicolide and metrafenone on cherry tomato and to estimate their half-life and characteristics of the residues. METHODS AND RESULTS: Pesticides were treated once on cherry tomato in field 1 and 2 under the standard application rate. The samples were collected 7 times at the end of 0(2 hours after pesticides spaying), 1, 2, 3, 5, 7 and 10 days before harvest. Residues of fluopicolide and metrafenone were analyzed by the LC-MS/MS. In this study, the method limit of quantification (MLOQ) for both fluopicolide and metrafenone in cherry tomato was found to be 0.005 mg kg-1. Their recovery levels were 92.7 - 94.8% and 82.6 - 88.0%, shown with coefficient of variation of less than 10%. Half-life of fluopicolide and metrafenone in field 1 and 2 were found to be 15.0 days and 12.8 days, 18.9 days and 21.5 days, respectively. CONCLUSION: Based on the results, this study shows the level of PHRL on cherry tomato is 0.27 mg/kg for fluopicolide and 2.29 mg/kg for metrafenone at 10 days before harvesting. The present study indicates the residues of both pesticides on cherry tomato will be below maximum residue limit (MRL) at harvest.
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