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Surface composition of the selected spray-dried formulations as measured by XPS (N 1s curve-fits).
| Formulation | Theoretical Surface Composition (atomic nitrogen percentage) | Measured Surface Composition (atomic nitrogen percentage) | ||||
|---|---|---|---|---|---|---|
| Colistin | Meropenem | Rifampicin | Colistin | Meropenem | Rifampicin | |
| Colistin-Meropenem | 7.0 | 93.0 | 0.0 | 51.7 | 42.9 | - |
| Meropenem-Rifampicin | 0.0 | 97.8 | 2.2 | - | 31.5 | 68.5 |
| Colistin-Meropenem-Rifampicin | 6.8 | 91.2 | 2.0 | 30.4 | 20.3 | 49.3 |
