Table 2.
Negative ion mode
| Class | Calculated mass | Molecular species | Measured mass | ∆ppm |
|---|---|---|---|---|
| Acidic glycosphingolipids/Sulfoglycosphingolipids [M-H]- | 778.5138 | C40H76SNO11 | 778.5156 | 2.31 |
| 794.5088 | C40H76SNO12 | 794.5123 | 4.4 | |
| 806.5451 | C42H80SNO11 | 806.5457 | 0.74 | |
| 850.5739 | C44H84SNO12 | 850.5726 | −1.52 | |
| 862.6077 | C46H88SNO11 | 862.6045 | −5.24 | |
| 876.6234 | C47H90SNO11 | 876.6188 | −5.24 | |
| 878.6026 | C46H88SNO12 | 878.6017 | −1.02 | |
| 888.6234 | C48H90SNO11 | 888.6231 | −0.33 | |
| 890.639 | C48H92SNO11 | 890.6386 | −0.44 | |
| 904.6183 | C48H90SNO12 | 904.6185 | 0.22 | |
| 906.6339 | C48H92SNO12 | 906.6333 | 0.66 | |
| Glycerophosphoinositols/Diacylglycerophosphoionositols [M-H]- | 857.5179 | C45H78O12P | 857.5169 | −1.16 |
| 885.5492 | C47H82O13P | 885.5485 | −0.79 |
In negative ion mode, the most dominant peaks detected by both NP-LDI analysis and Ar cluster SIMS are shown. Measured mass obtained from Ar SIMS