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Theoretical and Measured (by XPS) Surface Compositions of the Spray-Dried Formulations
| Formulation | % Theoretical composition | % Surface Composition | ||
|---|---|---|---|---|
|
|
|
|||
| L-leucine | Azithromycin | L-leucine | Azithromycin | |
| L-leucine-Azithromycin _1–1 | 13.6 | 86.4 | 2.4 | 97.6 |
| L-leucine-Azithromycin_4–1 | 38.7 | 61.3 | 9.2 | 90.8 |
