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. 2018 Apr 12;29(6):1273–1283. doi: 10.1007/s13361-018-1931-0

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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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Oxonium ions of MS/MS on intact glycopeptides after sialic acid derivatization. Sialic acids are present with ethyl and/or ethylenediamine, depending on their linkages