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| MALDI MS/MS validation results | |
| Linear range [µmol/L] | 50–1000 |
| LLOQ ( n = 5 ) [µmol/L] | 50 (CV = 14.5%) |
| Recovery (low/medium/high) | 48.7% / 48.9% / 7.7% |
| Stability [% recovery] | |
| RT (15 h in dark) | 98.5% |
| +4°C (24 h) | 85.6% |
| −20°C (1 month) | 107.9% |
MALDI-MS/MS assay: linearity, lower limit of quantification (LLOQ), recovery (at 130, 400 and 800 µmol/L) and stability after addition of formic acid.
