| Compound | Molecular weight | Monoisotopic mass | Quantitation (m/z) | Qualification (m/z) | ||
| Precursor ion | Product ion | Precursor ion | Product ion | |||
| Tryptophan | 204.225 | 204.09 | 205.1 | 188.1 | 205.1 | 146.1 |
| L-5-Hydroxytryptophan | 220.225 | 220.085 | 221.1 | 204.05 | 221.1 | 162 |
| Serotonin | 176.215 | 176.095 | 177.1 | 160.1 | 177.1 | 115.05 |
| L-Kynurenine | 208.214 | 208.085 | 209.1 | 192 | 209.1 | 94.05 |
| 5-Hydroxytryptophol | 177.2 | 177.079 | 178.1 | 160.1 | 178.1 | 115.05 |
| Tryptophol | 161.2 | 161.084 | 162.1 | 144.05 | 162.1 | 117.1 |
| 5-Hydroyindole-3-acetic acid | 190.176 | 190.051 | 192.1 | 146.05 | 192.1 | 110 |
| Indole-3-acetic acid | 175.184 | 175.063 | 176.1 | 130.05 | 176.1 | 77.05 |
| Anthranilic acid | 136.129 | 136.04 | 138.1 | 120.05 | 138.1 | 65.05 |
| Kynurenic acid | 189.167 | 189.043 | 190.1 | 144.05 | 190.1 | 89.1 |
| Quinaldic acid | 172.161 | 172.04 | 174.1 | 128.05 | 174.1 | 156.05 |
| Indole-3-butylic acid | 202.23 | 202.087 | 204.1 | 186.1 | 204.1 | 130.1 |
| 3-Hyroxykinurenine | 224.213 | 224.08 | 225.15 | 208.2 | 225.15 | 162.15 |
| Hyroxyanthranilic acid | 152.128 | 152.035 | 154.15 | 136.2 | 154.15 | 80.15 |
| Xanthutrenic acid | 205.167 | 205.038 | 206.15 | 160.2 | 206.15 | 132.2 |
| Melatonin | 232.279 | 232.121 | 232.2 | 174.1 | 232.2 | 130.05 |
| Qunolinic acid | 167.12 | 167.022 | 168 | 78.1 | 168 | 150 |