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. 2015 Jun 16;407(21):6557–6561. doi: 10.1007/s00216-015-8815-y

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© The Author(s) 2015

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Extracted ion chromatograms (A) of deuterated and non-deuterated denatonium benzoate samples mixed in different ratios: (1) 1:1, (2) 2:1, and (3) 1:2. The total ion chromatogram peak at Rt 18.83 min was selected for peak purity analysis (B). The ESI-MS spectra presented for points a–c of the total ion chromatogram (C)