Formulation and process considerations for the design of sildenafil-loaded polymeric microparticles by vibrational spray-drying.
Pharm Dev Technol
; 22(6): 691-698, 2017 Sep.
Article
en En
| MEDLINE
| ID: mdl-26740242
ABSTRACT
CONTEXT AND OBJECTIVE:
The current study reports the preparation and characterization of sildenafil-loaded poly(lactide-co-glycolide) (PLGA)-based microparticles (MPs) by means of vibrational spray-drying. Emphasis was placed on relevant formulation and process parameters with influence on the properties of obtained powders. Materials and methods, results anddiscussion:
The solid state solubility of sildenafil in spray-dried PLGA-MPs amounted to 17 wt.%. Thus, a drug loading below and above the determined solubility limit resulted in solid solutions and phase separation (i.e. solid dispersions), respectively. Furthermore, interactions between sildenafil and the PLGA matrix were observed for the spray-dried MPs. Optimization of spray-drying conditions allowed for a fabrication of defined MPs (size range of â¼4-8 µm) displaying a high sildenafil encapsulation efficiency (>90%) and sustained sildenafil release (from â¼4 to >12 h). The individual drug release rates from the spray-dried formulations were mainly a function of the drug loading, applied polymer and MP size. Finally, a scale-up of the preparation process did not result in a relevant change of the physicochemical and in vitro drug release properties of the prepared powders.CONCLUSION:
Identification of relevant formulation and spray-drying parameters enabled the fabrication of tailored sildenafil-loaded PLGA-based MPs, which meet the needs of the individual application (e.g. controlled drug delivery to the lungs).Palabras clave
Texto completo:
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Bases de datos:
MEDLINE
Asunto principal:
Química Farmacéutica
/
Composición de Medicamentos
/
Citrato de Sildenafil
/
Microesferas
Idioma:
En
Revista:
Pharm Dev Technol
Asunto de la revista:
FARMACIA
Año:
2017
Tipo del documento:
Article
País de afiliación:
Alemania