Spray-dried redispersible oil-in-water emulsion to improve oral bioavailability of poorly soluble drugs

Autor: Alexis Guérin, François Chevanne, Roger Leverge, Pascal Le Corre, G. Dollo, J. L. Burgot
Rok vydání: 2003
Předmět:
Zdroj: European Journal of Pharmaceutical Sciences. 19:273-280
ISSN: 0928-0987
DOI: 10.1016/s0928-0987(03)00134-9
Popis: A physically stabilized dry emulsion dosage form reforming the original emulsion after rehydration was developed by spray-drying a liquid oil-in-water emulsion containing maltodextrin as carrier and sodium caseinate as emulsifying agent. Several oil:water as well as maltodextrin:water ratios were tested, the homogenization and spray-drying processes and the reconstitution properties were investigated and an optimum formulation was selected for poorly soluble drug incorporation, having an identical oil:water and carrier:water ratio of 10% (w/w) and a load of solid material of 20% (w/w). Lipophilic 5-phenyl-1,2-dithiole-3-thione (5-PDTT) was selected as a model drug. 5-PDTT release from the solid state emulsion was studied using an in vitro two-phase stirred model and the relative bioavailability of 5-PDTT in the dry emulsion was obtained in the rabbit after oral administration of the reconstituted emulsion, compared to a 5-PDTT–sulfobutyl ether 7 β-cyclodextrin complex in solution. Incorporation of 5-PDTT in the oil phase neither affects the surface morphology of the powder nor the reconstitution, the droplet size or the drug releasing properties and, furthermore, allows a 3-fold improvement of 5-PDTT relative bioavailability in rabbit after oral administration. These results indicate that dry emulsions may be considered as relevant dosage forms to improve bioavailability of poorly absorbable lipophilic drugs.
Databáze: OpenAIRE
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