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. Author manuscript; available in PMC: 2019 Feb 20.
Published in final edited form as: Anal Chem. 2018 Jan 31;90(4):2578–2586. doi: 10.1021/acs.analchem.7b04044

Scheme 1.

Scheme 1

Reactions involved in the oxidation and isobaric labeling technique implemented in this study. Shown here is GM1a d18:1/18:0 as an ex-ample. Chemoselective oxidation of sialic acid side chain to generate aldehyde functional group (A). The afforded product undergoes aminoxyTMT labeling at the reactive aldehyde via oxime bond formation (B).