1. Introduction
Fungal keratitis is one of infectious corneal diseases and is an increasing disease in developing countries. And the incidence is increasing in developed countries due to increased use of contact lenses. To treat this, antifungal agent...
1. Introduction
Fungal keratitis is one of infectious corneal diseases and is an increasing disease in developing countries. And the incidence is increasing in developed countries due to increased use of contact lenses. To treat this, antifungal agents are used, typically natamycin and amphotericin B. However, its use is limited because of the narrow range of antifungal agents and low permeability. Voriconazole, a second-generation azole antifungal agent with a broad range of antifungal agents, is under investigation. The limitation of Voriconazole is that it has low water solubility and poor cornea permeability. Liposome as nano-carrier can be used to overcome this problem. Voriconazole can be encapsulated between phospholipids of liposome to enhance permeability while increasing solubility. There are various ways of making liposomes. Among the various methods of making liposomes, liposomes were prepared by the commonly used thin film hydration method. Therefore, the goal of this paper is to develop a liposomal formulation of voriconazole with broad spectrum antifungal activity, which is increased water solubility and permeability, thereby increasing the BA of voriconazole and ultimately increasing therapeutic efficiency.
2. Preparation of liposome
We prepared liposome by thin film hydration. Formulations of Increasing the organic solvent amount and molar ratio of HSPC were prepared. And we also prepared formulations containing a mPEG-DSPE, SA for positively charged liposome, and DP for negatively charged liposome. Cholesterol was added to find out effect of cholesterol to liposome.
3. Evaluation of liposome
Organic solvent amount did not affect to size, zeta potential, assay%, EE%. Increasing molar ratio of HSPC affect to the size, PDI, and pH. Cholesterol did not affect to liposome size, PDI and assay%, EE%, also. Formulation with SPC was viscous and size was largest. mPEG-DSPE makes zeta potetial of liposome to negative charge but stearylamine makes zeta potential to positive. Dicetylphosphate makes liposome acidic but stearylamine makes liposome basic. Voriconazole assay % was almost 100% and EE% was almost 94% in all formulation. Specially formulation with mPEG-DSPE showed 99% of EE%. In the DSC data, voriconazole peak and cholesterol peak was disappeared in all formulations. In vitro release data described that all liposome formulation has higher dissolution rate than 1% voriconazole suspension.
Formulation with mPEG-DSPE, Chol shows the higher dissolution rate. And permeation study with bovine cornea described that permeation rate followed the zeta potential. Formulation 12, and 15 have higher permeation rate and stearylamine formulation with positive zeta potential show lowest permeation rate.