title: Stereospecificity in toxicity of the optical isomers of EPN.
abstract: While the optical isomers of EPN were equally toxic to mice, (+)-EPN was 2.9 fold and 4.0 fold more toxic to houseflies and rice stem borer larvae, respectively, than the (-)-isomer. In addition, (-)-EPN produced paralysis of the legs in hens about 10 to 14 days after dosing, whereas (+)-EPN caused no paralytic effects. Thus, (+)-EPN appears to be a more appropriate insecticide than the racemic compound, since it combines high toxicity to insects and no delayed neruotoxicity in hens.
mesh_terms: D000818:Animals; D002645:Chickens; D005260:Female; D006793:Houseflies; D007313:Insecta; D007306:Insecticides / Q000633:toxicity*; D007928:Lethal Dose 50; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D010243:Paralysis / Q000139:chemically induced; D004849:Phenylphosphonothioic Acid, 2-Ethyl 2-(4-Nitrophenyl) Ester / Q000633:toxicity*; D013237:Stereoisomerism
chemical_list: D007306:Insecticides; D004849:Phenylphosphonothioic Acid, 2-Ethyl 2-(4-Nitrophenyl) Ester