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Clinical Chemistry, Vol 22, 879-883, Copyright © 1976 by American Association for Clinical Chemistry
WA Dechtiaruk, GF Johnson and HM Solomon
A gas-chromatographic procedure for acetaminophen is described in which the drug is chromatographed as the O-heptyl-N-methyl derivative. This derivative is prepared by a sequential alkylation procedure in which the phenolic hydroxyl group of the parent compound is alkylated off- column with heptyl iodide and the amide group is derivatized on-column by reaction with trimethylanilinium hydroxide. The internal standard, N- propionyl-p-aminophenol, is subjected to the same derivatization procedure. This gas-chromatographic procedure correlates well with conventional colorimetric and spectrophotometric procedures for acetaminophen and is more sensitive. Within-run precision (CV) was 2.0% at a serum concentration of 10.0 mg/liter (n = 10) and between-run precision was 4.0% over a period of eight months. This method is particularly applicable to studies of the pharmacokinetics of acetaminophen.
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