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. 2021 Mar 2;53(4):541–554. doi: 10.1007/s00726-021-02965-1

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© The Author(s) 2021

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Fig. 1 — Partial GC–MS chromatograms from quantitative analyses of dimethylamine (DMA) in urine samples of a renal transplant recipient (a) and of a healthy subject before donation (b). The upper and lower chromatograms show the ion currents produced by ions with m/z 240 (endogenous DMA) and m/z 246 (internal standard, d₆-DMA; 1000 µM), respectively. The retention time of the pentafluorobenzamide derivatives of DMA and d₆-DMA is 3.79 min and 3.76 min, respectively