Table 1.
Surface activity and stability performance of protein-containing surfactant preparations
| Sample | Film formation (initial) | Film formation (postexpansion) | Δ Area compression | Compression γmin | Stability γmin |
|---|---|---|---|---|---|
| Lipid extract + SP-B | ++ | + | ++ | ++ | ++ |
| Lipid extract + SP-C | + | + | + | + | 0 |
| Lipid extract + SP-B, SP-C | ++ | +++ | ++ | ++ | ++ |
| Native surfactant | +++ | +++ | +++ | +++ | +++ |
| Organic extract | +++ | +++ | ++ | +++ | +++ |
| Org. extract (reassambled) | ++ | +++ | ++ | +++ | +++ |
0 Poor.
+ Improved behavior (with respect to protein-free lipid preparations).
++ Very good behavior.
+++ Optimal behavior.