Abstract
Larval homogenates of C. p. pipiens degraded α-naphthyl esters, malathion and Cecropia C 18-juvenile hormone, but did not degrade methoprene (isopropyl-11-methoxy-3,7,11-trimethyl-2,4,-dodecadienoate) or hydroprene (ethyl-3,7,11-trimethyl-2,4-dodecadienoate). Hog liver carboxylesterase (E.C.3.1.1.1) degraded all these compounds. On the basis of inhibition data obtained with a number of organophosphorus compounds and p- chloromercuriphenyl sulphonic acid, it is concluded that in C. p. pipiens larvae the esterase hydrolysing α-naphthyl esters and the esterase hydrolysing malathion are similar (B-esterase), and different from the esterase hydrolysing C 18-juvenile hormone (A-esterase).
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