Table 2. Compositions of Selected Microemulsions (% w/w) and Particle Size (mean ± SD, n=3) .
| Formulation | Factorial | S/C | Oil | S+C | water | Particle size(nm) | Polydispersity |
| ME-1 | + + + | 4:1 | 30 | 55 | 15 | 15.3±0.5 | 0.362±0.032 |
| ME-2 | + + - | 4:1 | 30 | 65 | 5 | 53.9±1.3 | 0.411±0.015 |
| ME-3 | + - + | 4:1 | 5 | 80 | 15 | 20.8±0.8 | 0.372±0.024 |
| ME-4 | + - - | 4:1 | 5 | 90 | 5 | 31.7±1.05 | 0.352±0.016 |
| ME-5 | - - - | 3:1 | 5 | 90 | 5 | 17.3±0.4 | 0.361±0.027 |
| ME-6 | - - + | 3:1 | 5 | 80 | 15 | 14.1±0.6 | 0.362±0.010 |
| ME-7 | - + - | 3:1 | 30 | 65 | 5 | 59.3±1.7 | 0.393±0.031 |
| ME-8 | - + + | 3:1 | 30 | 55 | 15 | 36.5±1.2 | 0.381±0.022 |
+: high level; - : low level