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The paper presents a method for the determination of methadone, EDDP, and EMDP in postmortem biological materials using liquid‐liquid extraction with ethyl acetate (pH9) and UHPLC‐MS/MS technique. Methadone‐d9 and EDDP‐d3 were used as the internal standards. The method validation results for blood and urine were as follows: linearity: 0.5–1000 ng/ml; R2 > 0.9993 for methadone, EDDP and R2 > 0...
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