Table 1.
Peptide species detected by MS in the inlet length study with the corresponding charge state, m/z, mobility, and cross-section.
| Peptide | Charge state | m/z | Mobility (cm2/Vs) | Cross-section (Å2) |
|---|---|---|---|---|
| Leu-Enkephlin | 1 | 556.3 | 0.934 | 227 |
| Bradykinin | 2 | 530.9 | 1.216 | 340 |
| Bradykinin | 3 | 354.3 | 1.352 | 457 |
| Neurotensin | 2 | 837.2 | 1.138 | 369 |
| Neurotensin | 3 | 558.5 | 1.207 | 522 |
| Angiotensin | 2 | 649.0 | 1.092 | 386 |
| Angiotensin | 3 | 433.0 | 1.315 | 473 |
| Angiotensin | 4 | 325.1 | 1.599 | 514 |
| Fibrinopeptide A | 2 | 769.0 | 1.033 | 407 |
| Fibrinopeptide A | 3 | 513.1 | 1.288 | 481 |
*
The mobilities and cross sections for each ion were obtained experimentally by IMS MS in a N2 buffer gas using a 98 cm IMS drift cell at 4 Torr [23].