Article | 8. 2016 Vol. 34, Issue. 4
Dissipation Pattern of a Fungicide Mandipropamid in Korean Cabbage at Different Harvest Times under Greenhouse Conditions

Department of Herbal Medicine Resource, Kangwon National University1
Department of Biology, University of Texas-Arlington2
Food Standard Division, Ministry of Food and Drug Safety3
Department of Horticultural Science, Kyungpook National University4
Division of Life and Environmental Science, Daegu University5

2016.8. 644:654


Supervised residue trials for mandipropamid in Korean cabbage(Brassica campestris L.) were conducted to establish its pre-harvest residue limit (PHRL), a criterion to ensure the safety of the terminal pesticide residue during cabbage production. Tissues of Korean cabbage were collected at 0, 1, 3, 5, 7, and 10 days after mandipropamid application and subjected to residue analysis. The analytical method was validated by recoveries ranging from 88.2-92.2% at two levels (0.4 and 2.0 mg·kg-1), and a limit of quantitation (LOQ) of 0.04 mg·kg-1. Mandipropamid residues in Korean cabbage gradually decreased over time. The dissipation rate of the residue would be affected by intrinsic degradation of the compound along with dilution resulting from the fast growth of Korean cabbage. The decay pattern was well fitted by simple first-order kinetics. Biological half-lives of mandipropamid in Korean cabbage ranged from 3.9-4.0 days in two field conditions. Calculated by the regression curve of mandipropamid dissipation, the PHRLs of mandipropamid in Korean cabbage were recommended as 11.07-12.19 and 5.76-6.05 mg·kg-1 for 10 and 5 days prior to harvest, respectively.

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