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ESI-MS conditions for the analysis of test compounds.
| Compound | Range (ng/mL) | MRM transitions | Internal standard | Ionization |
|---|---|---|---|---|
| Hyperforin | 2.5–250 | 535.38 > 383.2 | Warfarin | ESI- |
| 535.38 > 313.2 | ||||
| Hypericin | 10–1′000 | 502.8 > 405.1 | Digoxin | ESI- |
| 502.8 > 433.1 | ||||
| Valerenic acid | 10–1′000 | 232.8 > 41 | Digoxin | ESI- |
| 232.8 > 84 | ||||
| Antipyrine | 5–500 | 189.1 > 104 | Antipyrine-d3 | ESI+ |
| 189.1 > 56.1 |
