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| Retention time, min | Peak name | Ion mass, negative mode | Ion mass, positive mode | |
|---|---|---|---|---|
| 6 | 19.54 | Unknown 1 | 303.08; 365.14 | 367.15; 389.12 |
| 7 | 23.57 | Indoxyl glucuronide (IGluc) | 308.08 | - |
| 8 | 25.62 | Tryptophan (Trp) | 203.08 | 205.10; 227.08 |
| 9 | 27.17 | Indoxyl sulfate (IS) | 212.00 | - |
| 10 | 27.71 | 5-hydroxy-indole-3-acetic acid | 146.06; 190.05 | - |
| 11 | 31.23 | Indoleacetyl glutamine (IaG) | 302.12 | 304.13; 326.11 |
| 12 | 39.91 | Indoleacetic acid (IAA) | 130.07; 174.06 | 176.07 |
