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. 2016 Apr 7;12:91. doi: 10.1007/s11306-016-1023-8

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© The Author(s) 2016

Open AccessThis 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. 3 — Extracted ion chromatogram between 8 and 10 min, obtained from detection in the negative ionization mode (a). Thanks to the implementation of an UHPLC method, two isobaric ions can be separated. The first one at 8.6 min (b) corresponds to the ¹³C isotope of PI38a:4, at m/z 886.5551, and the second one at 9.1 min (c) to the deprotonated ion of sulfatide d18:2/C24:1, at m/z 886.6099