TABLE 1.
LC-tandem MS parameters for ciprofloxacin, fusidic acid, rifampin and desacetyl rifampin and their deuterated internal standards
| Compound | Mode | Precursor-product ion pair m/z | Collision energy (V) |
|---|---|---|---|
| Ciprofloxacin | ESI positive | 332.2 > 314.2 | −20.1 |
| Ciprofloxacin-d8 | ESI positive | 340.2 > 322.2 | −21.4 |
| Desacetyl rifampin | ESI positive | 781.5 > 749.35 | −13 |
| Desacetyl rifampin-d4 | ESI positive | 785.5 > 753.4 | −11.6 |
| Rifampin | ESI positive | 823.3 > 791.55 | −19 |
| Rifampin-d4 | ESI positive | 827.30 > 795.45 | −20.2 |
| Fusidic acid | ESI negative | 515.3 > 455.30 | 19.1 |
| Fusidic acid-d6 | ESI negative | 521.47 > 461.40 | 19.7 |