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The inhibition of 1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane (DDT) dehydrochlorinase and glutathione S-aryltransferase in grass-grub and housefly preparations.

The inhibition of DDT [1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane] dehydrochlorinase and glutathione S-aryltransferase by diphenylmethane and triphenylmethane derivatives was examined. Bis-(3,5-dibromo-4-hydroxyphenyl)methane and similar compounds were excellent inhibitors of both enzymes, but only DDT dehydrochlorinase was inhibited by compounds similar to bis-(N-dimethylaminophenyl)methane. Colour salts of the basic triphenylmethyl dyes were excellent inhibitors of both enzymes. All the inhibitors examined appeared to act by competition with glutathione for its binding site on the two enzymes.