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. 2007 Sep 1;856(1-2):267-72.
doi: 10.1016/j.jchromb.2007.06.004. Epub 2007 Jun 16.

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

Diaa M Shakleya  1 , Lauren M Jansson, Marilyn A Huestis
Affiliations

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

Diaa M Shakleya et al. J Chromatogr B Analyt Technol Biomed Life Sci. .

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.

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