title: Determination of mifepristone levels in wild canid serum using liquid chromatography.
abstract: An HPLC method was developed to determine levels of mifepristone, in coyote (Canis latrans) serum where mifepristone will be used as an oral contragestive agent for nonlethal predator control. Serum samples were extracted using C(18) solid-phase extraction cartridges. A synthetic analog of mifepristone, RTI-3021-003, was used as the internal standard. Separation of the compounds was achieved by using a C(18) (150 x 4.6 mm) column. The mobile phase was 55% acetonitrile in water running at 1.0 ml/min with UV detection at 305 nm. The assay was linear in the range of 10 to 1000 ng/ml. Inter-day accuracies for 10, 200 and 1000 ng/ml were 95.9, 99.4 and 104.7%, respectively. Inter-day precisions measured by RSD were 19.8, 9.7 and 4.5%. Intra-day accuracies were 117, 106.9 and 99.4% for 10, 200 and 1000 ng/ml, respectively. Intra-day RSDs were 19.7, 3.7 and 9.3%, respectively. A simple, sensitive and validated HPLC analytical method was developed to quantitate mifepristone in canine serum.
authors.affiliation: Department of Animal Sciences, PO Box 3684, University of Wyoming, Laramie, WY 82071, USA. charlie@uwyo.edu
authors.forename: Charles
authors.initials: C
authors.lastname: Stith
authors.forename: M
authors.initials: M
authors.lastname: Delwar Hussain
mesh_terms: D000818:Animals; D002335:Carnivora; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003280:Contraceptives, Oral, Synthetic / Q000097:blood*; D015735:Mifepristone / Q000097:blood*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D003280:Contraceptives, Oral, Synthetic; D015735:Mifepristone