Table 2.
Masses and Identities of CS-Glycopeptide Oxonium Ions
| Nominal mass | Monoisotopic mass | Composition |
|---|---|---|
| Protonated oxonium ions | ||
| 126.05 | 126.0550 | [GalNAc-C2H6O3]+ |
| 138.05 | 138.0550 | [GalNAc-CH6O3]+ |
| 141.02 | 141.0183 | [ΔHexA-H2O]+ |
| 144.07 | 144.0656 | [GalNAc-C2H4O2]+ |
| 168.07 | 168.0655 | [GalNAc-2H2O]+ |
| 186.08 | 186.0761 | [GalNAc-H2O]+ |
| 204.09 | 204.0867 | [GalNAc]+ |
| 214.07 | 214.0710 | [GalNAc+CO-H2O]+ |
| 232.08 | 232.0816 | [GalNAc+CO]+ |
| 246.10 | 246.0972 | [GalNAc+CH2CO]+ |
| 274.09 | 274.0921 | [Neu5Ac-H2O]+ |
| 292.10 | 292.1027 | [Neu5Ac]+ |
| 362.11 | 362.1082 | [ΔHexAGalNAc]+ |
| 380.12 | 380.1188 | [GlcAGalNAc]+ |
| 442.06 | 442.0650 | [ΔHexAGalNAc+SO3]+ |
| Sodiated oxonium ions | ||
| 328.01 | 328.0075 | [GalNAc+SO3+2Na-H]+ |
| 356.00 | 356.0024 | [GalNAc+CO+SO3+2Na-H]+ |
| 370.02 | 370.0181 | [GalNAc+COCH2+SO3+2Na-H]+ |
| 384.09 | 384.0902 | [ΔHexAGalNAc+Na]+ |
| 486.03 | 486.0290 | [ΔHexAGalNAc+SO3+2Na-H]+ |
| 560.12 | 560.1223 | [ΔHexAGalNAcGlcA+Na]+ |
| 662.06 | 662.0611 | [ΔHexAGalNAcGlcA+SO3+2Na-H]+ |
| 722.18 | 722.1751 | [ΔHexAGalNAcGlcAGal+Na]+ |
| 884.23 | 884.2279 | [ΔHexAGalNAcGlcAGalGal+Na]+ |
| 926.05 | 926.0527 | [ΔHexAGalNAcGlcAGal+2SO3+3Na-2H]+ |