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S-oxygenation of an alkylmercaptotriazine herbicide by rat, rabbit and human liver enzymes.

1. The oxidation of the herbicide cyanatryn to cyanatryn S-oxide and de-ethylcyanatryn was used to study S-oxidation and N-de-ethylation in liver microsomes from three species. 2. Both reactions were dependent upon NADPH and were inhibited by methyrapone and CO. However, the enzyme catalysing N-de-ethylation exhibited different species/sex specificity from the S-oxygenase. 3. Rat liver flavoprotein S-oxygenase had no action on cyanatryn, suggesting, with the other data, that the S-oxygenation was catalysed by cytochrome P-450. 4. S-Oxygenation proceeded rapidly in human liver microsomes and the rats was linear for 60 min at 37 degrees C.