| Popis: |
Objective: The objective of present study was formulation development of imiquimod using lactic acid and span 80 for topical delivery to cure genital warts.Methods: Lipid based vesicles (LBV) of 2% imiquimod were prepared with phospholipoin 90G, ethanol, lactic acid and span 80 using central composite design. The prepared vesicles were optimized statistically and characterized for particle size, zeta potential, percentage entrapment efficiency (% EE) and transmission electron microscopy (TEM). The optimized LBV were incorporated into gel formulation which was evaluated and compared with control gel and marketed formulation.Results: The optimized vesicles had particle size 394.8±9.6 nm, zeta potential-16.5±2.5 mV, % EE 88.27±0.45 and TEM study confirmed the formation of vesicular structure with spherical shape. The gel formulation of imiquimod vesicles showed positive results like spreadability 14.3±0.34 gcm/s, viscosity 13500±1.67 cp, consistency 6.1±0.14 mm and extrudability 16.47±0.11 g/cm2. In vitro permeation amount of drug was remarkably lower (10.13 %) than control (87.17 %) and marketed formulation (27.46 %). Results of retained drug for both in vitro as well as in vivo permeation study and local accumulation efficiency (4.021±0.2292) were considerably higher for LBV gel than control (0.1008±0.002513) and marketed formulation (0.8314±0.0300). To understand the mechanism of interaction between skin and vesicles, fourier transform infra-red spectroscopy studies were also done. Results of skin irritancy test and histological examination revealed biocompatible nature of formulation.Conclusion: Results of in vitro and in vivo studies indicated that this vesicle gel formulation provided efficient and site specific dermal delivery of imiquimod for cure of genital warts. |
