title: Validation of a LC-APCI-MS/MS method for quantification of methadone, 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine (EDDP) and 2-ethyl-5-methyl-3,3-diphenylpyraline (EMDP) in infant plasma following protein precipitation.
abstract: A validated, quantitative LC-APCI-MS/MS method for methadone, EDDP and EMDP in 200-microL plasma is presented. Specimen preparation was limited to protein precipitation and centrifugation. Chromatographic separation was achieved on a Synergi Hydro-RP 80A (50 mm x 2.0 m, 4 microm) column with gradient elution. The assay was linear from 1 to 500 ng/mL, with intra- and inter-assay accuracy >or=87.5% and intra- and inter-assay precision <13.4% R.S.D. and recovery >or=87.5% for all analytes at 40 ng/mL. This analytical method is suitable for the accurate and precise determination of methadone and metabolites in human plasma specimens.
authors.affiliation: Chemistry and Drug Metabolism, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, 5500 Nathan Shock Drive, Baltimore, MD 21224, United States.
authors.forename: Diaa M
authors.initials: DM
authors.lastname: Shakleya
authors.forename: Lauren M
authors.initials: LM
authors.lastname: Jansson
authors.forename: Marilyn A
authors.initials: MA
authors.lastname: Huestis
mesh_terms: D001798:Blood Proteins / Q000378:metabolism*; D011232:Chemical Precipitation; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D007223:Infant; D008691:Methadone / Q000097:blood*; D011759:Pyrrolidines / Q000097:blood*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: C103254:2-ethyl-5-methyl-3,3-diphenylpyrroline; D001798:Blood Proteins; D011759:Pyrrolidines; D008691:Methadone; C010724:2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine