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Final concentrations of internal working solution.
| Internal standard | Concentration (ng/mL) |
|---|---|
| KynA-D5 | 60 |
| Picolinic acid-D3 | 1500 |
| QUIN-D3 | 1500 |
| 3-HK-13C2-15N | 1500 |
| Kynurenine-D4 | 1500 |
| 3-Hydroxyanthanilic acid-D3 | 1500 |
| Tryptophan-D5 | 3000 |
3-HK: 3-hydroxykynurenine; KynA: kynurenic acid; QUIN: quinolinic acid.
