Table 2.
NE formulation composition and physical screening studies.
| Formulation code | Surfactant : co-surfactant ratio | Oil % |
Smix% | Water % |
Physical Stability test | Inference | |||
|---|---|---|---|---|---|---|---|---|---|
| Surfactant | Co-surfactant | Heating | Freeze thaw cycle | Centrifugation | |||||
| F1 | 4:1 | 10 | 32 | 8 | 50 | ✓ | ✓ | ✓ | Passed |
| F2 | 20 | 25 | 5 | 50 | - | - | - | Failed | |
| F3 | 18.18 | 21.82 | 5.45 | 54.55 | - | - | - | Failed | |
| F4 | 14.04 | 16.84 | 4.21 | 64.91 | - | - | - | Failed | |
| F5 | 11.94 | 14.33 | 3.58 | 70.15 | ✓ | ✓ | ✓ | Passed | |
| F6 | 14.81 | 23.71 | 5.92 | 55.56 | ✓ | - | - | Failed | |
| F7 | 11.63 | 18.61 | 4.65 | 65.12 | ✓ | ✓ | ✓ | Passed | |
| F8 | 11.11 | 19.445 | 19.445 | 50 | ✓ | ✓ | ✓ | Passed | |
| F9 | 10 | 17.5 | 17.5 | 55 | ✓ | - | - | Failed | |
| F10 | 8.89 | 15.55 | 15.55 | 60 | ✓ | - | - | Failed | |
| F11 | 7.75 | 13.56 | 13.56 | 65.12 | ✓ | - | - | Failed | |
| F12 | 6.67 | 11.665 | 11.665 | 70 | ✓ | ✓ | ✓ | Passed | |
| F13 | 7.49 | 18.725 | 18.725 | 55 | ✓ | - | - | Failed | |
| F14 | 6.67 | 16.665 | 16.665 | 60 | ✓ | ✓ | ✓ | Passed | |
| F15 | 5.8 | 14.495 | 14.495 | 65.22 | ✓ | ✓ | ✓ | Passed | |
| F16 | 5 | 12.5 | 12.5 | 70 | ✓ | - | - | Failed | |
NE formulation composition and physical screening studies, results of which demonstrated that the formulations prepared from the Smix ratio of 4:1 passed the physical stability test.