title: Cytogenetic, genetic, and embryotoxicity studies with dimethyl 2,2,2-trichloro-1-(2,2,2-trichloro-1-hydroxyethoxy)-ethylphosphonat e, a hypothetical impurity in technical grade trichlorfon.
abstract: The hemiacetal (CH3O)2P(O)CHOCHOHCCl3)CCl3, a hypothetical contaminant in technical preparations of the organophosphorus pesticide trichlorfon, was tested for cytogenetic, mutagenic, and embryotoxic activity after ip administration to mice of different strains. A single dose of 81 mg/kg (0.2 mmol/kg) caused a significant enhancement in the percentage of chromosome aberrations in bone marrow cells of CFLP mice; a similar effect was induced by an equimolar single dose of chemically pure trichlorfon (51.5 mg/kg). At the same dosage level, the hemiacetal proved to be ineffective in the micronucleus test on fetal blood of DBA and AB Jena/Halle mice. In the dominant lethal mutation assay, a single dose of 81 mg/kg hemiacetal to males resulted in a slight increase in the fetal mortality of DBA mice, whereas AB Jena/Halle mice did not respond under these conditions. Four consecutive doses of 81 mg/kg hemiacetal to pregnant AB Jena/Halle mice at Days 2, 3, 4, and 5 of gestation caused only a very weak embryotoxic effect comparable to that of trichlorfon at equimolar dosage. On the basis of these results the hemiacetal tested may not be considered to represent a potential risk factor in technical grade trichlorfon.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000648:ultrastructure; D002869:Chromosome Aberrations / Q000187:drug effects; D004622:Embryo, Mammalian / Q000187:drug effects*; D005260:Female; D007306:Insecticides / Q000633:toxicity*; D051379:Mice; D008811:Mice, Inbred DBA; D009152:Mutagenicity Tests; D009153:Mutagens; D011247:Pregnancy; D051381:Rats; D013723:Teratogens; D014236:Trichlorfon / Q000032:analysis* / Q000633:toxicity / Q000031:analogs & derivatives
chemical_list: D007306:Insecticides; D009153:Mutagens; D013723:Teratogens; C052978:2,2,2-trichloro-1-(2,2,2-trichloro-1-hydroxyethoxy)ethyl phosphonate; D014236:Trichlorfon