Physicochemical characterization of molecular assemblies of miltefosine and amphotericin B.
Mol Pharm
; 4(2): 281-8, 2007.
Article
en En
| MEDLINE
| ID: mdl-17397240
ABSTRACT
This study describes the interactions between two amphiphilic molecules with antileishmanial activity, amphotericin B (AmB) and miltefosine [hexadecylphosphocholine (HePC)], the latter being effective by the oral route. The effect of HePC on the aggregation state of AmB in aqueous solution and the interactions between the two agents were monitored using absorption spectroscopy and circular dichroism. Structural characterization of the mixed aggregates formed in water by dynamic light scattering (DLS) and cryofracture electron microscopy was performed. At concentrations above its critical micelle concentration, HePC was shown to interact with AmB, leading to an increase in the proportion of AmB in its monomeric form as a result of a micellar solubilization mechanism with a capacity of 26 +/- 3 mmol of AmB solubilized/mol of HePC, that is, nearly 40 molecules of HePC per molecule of AmB in the mixed micelles. These were revealed as individual and spherical aggregates close to 10 nm in diameter by both electron microscopy and DLS. Such a micellar formulation provides a new AmB-based system which might be useful in delivering AmB orally for visceral leishmaniasis bitherapy.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Fosforilcolina
/
Anfotericina B
/
Sistemas de Liberación de Medicamentos
/
Antiprotozoarios
Tipo de estudio:
Evaluation_studies
Idioma:
En
Revista:
Mol Pharm
Asunto de la revista:
BIOLOGIA MOLECULAR
/
FARMACIA
/
FARMACOLOGIA
Año:
2007
Tipo del documento:
Article
País de afiliación:
Francia