| Formulation code | Nanoparticles: Anhydrous lactose | Angle of repose a | Carr’s indexa | Housner ratio a |
|---|---|---|---|---|
| DPI 1 | 1.0:0.5 | 33.68 ± 1.34 | 11.12 ± 0.41 | 1.13 ± 0.001 |
| DPI 2 | 1.0:1.0 | 27.41 ± 0.73 | 8.13 ± 1.92 | 1.09 ± 0.02 |
| DPI 3 | 1.0:1.5 | 32.86 ± 2.38 | 12.08 ± 1.81 | 1.14 ± 0.02 |
| DPI 4 | 1.0:2.0 | 34.98 ± 0.41 | 13.54 ± 1.80 | 1.16 ± 0.02 |
| a Values are mean ± standard deviation | ||||