水稲におけるマラチオンおよびメチルパラチオンの代謝生成物

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タイトル別名
  • Metabolic Fate of Malathion and Methyl Parathion in Rice Plant
  • スイトウ ニ オケル マラチオン オヨビ メチルパラチオン ノ タイシャ セイセイブツ エイブン

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The metabolic fate of 35S-labeled malathion and methyl parathion which were sprayed on rice plants was examined. When the metabolic rate of the insecticides was examined by the partition ratio of the insecticide metabolites between chloroform and trichloroacetic acid aqueous solution, it was found that the greater part of the insecticide metabolites contained in rice grains was water extractable even one week after spraying insecticides. The water extracts of the insecticide metabolites in rice grains were subjected to ion exchange chromatography, and the existence of several hydrolysis products of the insecticides was confirmed in both cases of malathion and methyl parathion. The main metabolites in the case of malathion were thiophosphoric acid and carboxy derivatives of malathion, while those of methyl parathion were thiophosphoric acid, O, O-dimethyl thiophosphoric acid and O-p-nitrophenyl thiophosphoric acid.

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