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- ArticleRäisänen M, Kärkkäinen J.Biomed Mass Spectrom. 1978 Oct;5(10):596-600.A specific and sensitive method is described for the identifcation and quantification of the N-mono- and dimethylated derivatives of tryptamine and serotonin by gas chromatography mass spectrometry. Deuterated analogues of the amines have been prepared for use as internal standards. The technique has been applied to the determination of indoleethylamine N-methyltransferase activity in rabbit and human lung. No interference from the beta-carboline formation or other side reactions between the substrates and the methyl donor was observed.