Table 2. MS/MS conditions during MRM transition for the analyzed compound.
| Compound name | Polarity | Precursor ion | Product ion | Dwell time | Collision energy |
| (m/z) | (m/z) | (ms) | (V) | ||
| Nτ-Methylhistidine | + | 170.20 | 124.10 | 100 | −17.0 |
| Nτ-Methyl-d3-histidine | + | 173.20 | 127.10 | 100 | −14.0 |
| Nπ-Methylhistidine | + | 170.20 | 96.00 | 100 | −19.0 |