Figure 1.

Physicochemical properties of microemulsions_
| Properties | ME1 | ME2 |
|---|---|---|
| Particle size (nm) ± SD | 42.47 ± 11.25 | 61.4 ± 6.043 |
| Viscosity (mPa s) ± SD | 33.036 ± 0.061 | 31.281 ± 0.686 |
| Transmittance ± SD | 99.009 ± 0.434 | 97.882 ± 0.168 |
| pH ± SD | 5.08 ± 0.10 | 5.21 ± 0.10 |
| Conductivity (µs cm−1) ± SD | 33.9 ± 0.1 | 40.6 ± 0.1 |
| Solubility of NIM (µg mL−1) ± SD | 73.65 ± 12.03 | 247.55 ± 26.31 |
Drug release from microemulsion gel systems and their viscosity_
| Sample | Viscositya (mPa s) | The cumulative amount of NIM after 6 h (µg cm−2) ± SDb |
|---|---|---|
| ME1 XG gel | 145.10 | 556.20 ± 0.630 |
| ME1 HEC gel | 835.33 | 2483.83 ± 0.795 |
| ME2 XG gel | 184.30 | 1511.40 ± 0.436 |
| ME2 HEC gel | 194.60 | 3226.28 ± 0.486 |