Microspheres comprising a gelified polar core which is optionally surrounded by concentric and alternating superimposed n lipidic bilayers or n aqueous liquid layers and n gelified polar layers, n being an integer. The microspheres of the invention are obtainable by delipidation of liposomes designated as liposomes having a gelified polar core, of the type comprising at least one outer lipidic bilayer and at least one inner polar aqueous phase containing a gelified substance.

Les microsphères comportant a gelified le noyau polaire qui est sur option entouré par concentrique et les bilayers lipidiques superposés alternatifs de n ou les couches liquides de n et le n aqueux gelified des couches polaires, n étant un nombre entier. Les microsphères de l'invention sont procurables par le delipidation des liposomes indiquées comme liposomes ayant a gelified le noyau polaire, du type comportant au moins un bilayer lipidique externe et au moins une phase aqueuse polaire intérieure contenant a gelified la substance.

 
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