title: The comparative metabolism of diisopropyl methylphosphonate in mink and rats.
abstract: This study reports the metabolism of carbon-14labeled diisopropyl methylphosphonate (DIMP) in mink and rats, undertaken to better understand the dose-related mortality reported for mink in a previous study. In both male and female mink and rats, DIMP was rapidly absorbed after oral administration; it was metabolized by a saturable pathway to a single metabolite, isopropyl methylphosphonate (IMPA), which was rapidly excreted, primarily in the urine (90%). Fecal radioactivity, also identified as IMPA, was 1.7-3.1% of the administered dose. Female rats had a slower rate of conversion of DIMP to IMPA and less total excretion of IMPA than male rats. Metabolism of DIMP administered intravenously was not very different from that given orally in both species. These data indicate that mink absorb, metabolize, and excrete DIMP (as IMPA) in a manner very similar to mice, rats, and dogs.
authors.affiliation: Department of Veterinary Pathobiology, University of Minnesota, St. Paul 55108.
authors.forename: D J
authors.initials: DJ
authors.lastname: Weiss
authors.forename: R S
authors.initials: RS
authors.lastname: Geary
authors.forename: W
authors.initials: W
authors.lastname: Wustenberg
authors.forename: T J
authors.initials: TJ
authors.lastname: Bucci
authors.forename: V
authors.initials: V
authors.lastname: Perman
authors.forename: I P
authors.initials: IP
authors.lastname: Baumel
authors.forename: J C
authors.initials: JC
authors.lastname: Dacre
mesh_terms: D000284:Administration, Oral; D000818:Animals; D005260:Female; D007275:Injections, Intravenous; D008297:Male; D008907:Mink; D009943:Organophosphorus Compounds / Q000097:blood / Q000378:metabolism* / Q000652:urine; D051381:Rats; D017207:Rats, Sprague-Dawley; D012737:Sex Factors; D013045:Species Specificity
chemical_list: D009943:Organophosphorus Compounds; C048760:isopropyl methylphosphonic acid; C023477:diisopropyl methylphosphonate