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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

Negative ESI-MS/MS spectra of unoxidized (A) and oxidized (B) ganglioside GM1a d18:1/18:0 acquired using Q Exactive HF. Asterisk ( ) on the Neu5Ac symbol indicates aldehyde at C-7 position. Insets show the magnified m/z 126–131 region. Δ indicates absolute mass error. Fragments are labeled according to Domon and Costello nomenclature⁴³. Structure and systematic name of gangliosides are shown in Supporting Information Table S1.

Inline graphic — Negative ESI-MS/MS spectra of unoxidized (A) and oxidized (B) ganglioside GM1a d18:1/18:0 acquired using Q Exactive HF. Asterisk ( ) on the Neu5Ac symbol indicates aldehyde at C-7 position. Insets show the magnified m/z 126–131 region. Δ indicates absolute mass error. Fragments are labeled according to Domon and Costello nomenclature⁴³. Structure and systematic name of gangliosides are shown in Supporting Information Table S1.