Abstract

The ability of purified microsomal FAD-containing monooxygenase from mouse and pig liver to oxidize pesticides has been investigated. The kinetic constants, K m and V max, were determined for a number of pesticide substrates including thioether-containing organophosphorus compounds and carbamates as well as (di)alkyldithiocarbamates. In general, the mouse liver enzyme had K m values higher than those of the pig liver enzyme. Values for V max were similar regardless of substrate, although the V max typical of the mouse liver enzyme was approximately twice that of the pig liver enzyme. The thioether-containing organophosphorus compounds were the best substrates for both enzymes followed by the thioether-containing carbamates. The (di)alkyldithiocarbamates were relatively poor substrates for both pig and mouse liver microsomal FAD-containing monooxygenases.

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