Table 7. Stability and Solubility of 4, 1, and 5.
| cephalexin 4 | 1 | 5 | |
|---|---|---|---|
| pH 2 stability (%)a | 73.7 | 110 | 102 |
| pH 7 stability (%)a | 102 | 133 | 101 |
| pH 12 stability (%)a | 0.000 | 0.000 | 0.000 |
| solubility (μM/pH 7.4)b | 75.8 | 22.7 | 83.7 |
Percent remaining after a 4 h incubation at 37 °C.
Determined after shaking at room temperature for 4 h.