Structural Elucidation of the Ceramide Moiety of Starfish Gangliosides by Collision-Induced Dissociation of the Sodium Ion Complex

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Collision-induced dissociation (CID) spectra of sodium ion complexes ([M+Na]⁺ ions), produced by FAB-MS of methyl ester derivatives of ganglioside, indicate the length of the fatty acyl chain of the ceramide moieties without chemical degradation. In the case of a genuine ganglioside, only the fission of the glycosyl linkage of sialic acid was prominently observed.