Table 1.
Physicochemical properties of simulated lung fluid (SLF) when freshly manufactured and when reconstituted after freeze-drying. All measurements made at 25 °C, data represent mean ± SD (n = 3).
| Physicochemical property | SLF before freeze-dried | SLF after freeze-dried |
|---|---|---|
| Appearance [mean grey value] | 168.6 ± 0.4 | 168.6 ± 0.1 |
| pH | 7.2 ± 0.0a | 7.7 ± 0.1a |
| Conductivity [mS/m] | 14.5 ± 0.1 | 14.6 ± 0.2 |
| Viscosity [Pa.s x 10−3] | 1.138 ± 0.008 | 1.111 ± 0.015 |
| Surface Tension [mN/m] | 54.9 ± 0.3 | 55.6 ± 0.7 |
a
Difference is significant (T-test, p ≤ 0.05).