[en] Lipophilic drugs have limited solubility in phospholipid systems, hence maximum entrapment levels in liposomes are known to be low. "Drugs-in-cyclodextrin-in-liposome" systems were previously proposed to overcome this drawback but studies were limited to beta CD and HP beta CD. In some cases, other cyclodextrins may be more interesting than beta CD or HPPCD, such as methylated cyclodextrins. However, these cyclodextrins are known to extract lipid components from the lipid membrane, which may destabilize liposomes. We tested the influence of several cyclodextrins (beta CD, gamma CD, Dimeb, Trimeb, Crysmeb, Rameb, HP beta CD and HP gamma CD) on the aqueous solubility of betamethasone by phase solubility diagrams and on the encapsulation efficiency in liposomes. The release kinetics of betamethasone was studied using Franz diffusion cells. We showed that release kinetics are directly correlated with encapsulation efficiency, which is closely related to betamethasone concentration in cyclodextrin complex solution. No liposome destruction was observed, even with the testing of methylated cyclodextrins at the highest concentration (40 mM). This can be explained by the fact that these cyclodextrins have a higher affinity for betamethasone than for cholesterol. This was proved by the comparison of phase solubility diagrams of both betamethasone and cholesterol. (c) 2006 Elsevier B.V. All rights reserved.
Disciplines :
Pharmacy, pharmacology & toxicology
Author, co-author :
Piel, Géraldine ; Université de Liège - ULiège > Département de pharmacie > Pharmacie galénique et magistrale
Piette, Marie ; Université de Liège - ULiège > Département de pharmacie > Pharmacie galénique
Barillaro, Valery
Castagne, Delphine ; Université de Liège - ULiège > Département de pharmacie > Pharmacie galénique et magistrale
Evrard, Brigitte ; Université de Liège - ULiège > Département de pharmacie > Pharmacie galénique
Delattre, Luc ; Université de Liège - ULiège > Département de pharmacie > Département de pharmacie
Language :
English
Title :
Betamethasone-in-cyclodextrin-in-liposome: The effect of cyclodextrins on encapsulation efficiency and release kinetics
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