. 2007 Sep 12;81(23):12846–12858. doi: 10.1128/JVI.01311-07

TABLE 1.

ES-MS and ES-CID-MS/MS analyses of gangliosides GM1(Ac) and GM1(Gc)

Ganglioside	(M − H)⁻^a	Other major fragment ions^b							Ceramide ions, Y₀^c
Ganglioside	(M − H)⁻^a	Y₂_α	Y₂_β	D_Y2_α-2_β	Y₁	Z₁	B₂_β	B₁_α	Ceramide ions, Y₀^c
GM1(Ac)	1,544 (100)	1,253	1,179	888	726	708	364	290	564 (d18:1 18:0)
GM1(Ac)	1,572 (40)	1,281	1,207	916	754	736	364	290	592 (d20:1 18:0)
GM1(Gc)	1,560 (60)	1,253	1,195	888	726	708	364	306	564 (d18:1 18;0)
GM1(Gc)	1,588 (100)	1,281	1,223	916	754	736	364	306	592 (d20:1 18:0)

Nominal mass is given, and relative intensity is shown in parentheses.

The nomenclature for the fragment ions is based on that described in references 12 and 19.

Sphingosine and fatty acid assignments in parentheses are based on detailed ceramide analysis (Table 2).