TABLE 2.
ES-CID-MSn analyses of ceramides from gangliosides GM1(Ac) and GM1(Gc)
| Ganglioside | Mass
|
Ceramide assignment | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ceramide ions
|
Fatty acid ionsa
|
Long-chain base ions
|
||||||||||
| Y0 | —H2O | —CH2O | —CH4O | —CH4O2 | A | B | C | D | E − H2O | F | ||
| GM1(Ac) | 564 | 546 | 534 | 532 | 516 | 282 | 308 | 324 | 237 | 263 | 268 | d18:1 18:0 |
| 592 | 574 | 562 | 560 | 544 | 282 | 308 | 324 | 265 | 291 | 296 | d20:1 18:0 | |
| GM1(Gc) | 564 | 546 | 534 | 532 | 516 | 282 | 308 | 324 | 237 | 263 | 268 | d18:1 18:0 |
| 592 | 574 | 562 | 560 | 544 | 282 | 308 | 324 | 265 | 291 | 296 | d20:1 18:0 | |
a
Nomenclature for the fatty acid and long-chain base fragment ions is as described in reference 42.