Table 4.
MRM ion pairs and mass spectrometric parameters
| Amino acids | Q1 | Q3 | CE | DP | EP | CXP |
|---|---|---|---|---|---|---|
| Pro | 116.1 | 70.1 | 25 | 21 | 15 | 5 |
| Val | 118.1 | 72.1 | 50 | 17 | 15 | 5 |
| Pro IS | 121.1 | 74.1 | 25 | 21 | 15 | 5 |
| Val IS | 126.1 | 80.1 | 50 | 17 | 15 | 5 |
| Leu | 132.1 | 86.1 | 52 | 13 | 15 | 5 |
| Orn | 133.1 | 70.1 | 45 | 24 | 15 | 5 |
| Leu IS | 135.1 | 89.1 | 52 | 13 | 15 | 5 |
| Orn IS | 139.1 | 76.1 | 45 | 24 | 15 | 5 |
| Met | 150.1 | 104.1 | 49 | 15 | 6 | 5 |
| Met IS | 153.1 | 107.1 | 49 | 15 | 6 | 5 |
| Phe | 166.1 | 120.1 | 48 | 18 | 15 | 5 |
| Phe IS | 172.1 | 172.1 | 48 | 18 | 15 | 5 |
| Arg | 175.1 | 175.1 | 60 | 30 | 15 | 5 |
| Cit | 176.1 | 176.1 | 44 | 23 | 7 | 5 |
| Cit IS | 178.1 | 178.1 | 44 | 23 | 7 | 5 |
| Arg IS | 180.1 | 180.1 | 60 | 30 | 15 | 5 |
| Tyr | 182.1 | 182.1 | 52 | 19 | 9 | 5 |
| Tyr IS | 188.1 | 188.1 | 52 | 19 | 9 | 5 |
| Gly | 76 | 76 | 46 | 17 | 5 | 5 |
| Gly IS | 78 | 78 | 46 | 17 | 5 | 5 |
| Ala | 90 | 90 | 48 | 21 | 10 | 5 |
| Ala IS | 94 | 94 | 48 | 21 | 10 | 5 |
IS, Internal Standard; PRO, Proline; VAL, Valine; LEU, Leucine; ORN, Ornithine; MET, Methionine; PHE, Phenylalanine; ARG, Arginine; CIT, Citrulline; TYR, Tyrosine; GLY, Glycine; ALA, Alanine.