Compositions of bioactive material particles dispersed in a...

A - Human Necessities – 61 – K

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A61K 9/48 (2006.01) A61K 31/663 (2006.01)

Patent

CA 2452056

A solid phannaceutical composition comprising a water-soluble bioactive material and an encapsulating material which is present in the composition in the form of continuous solid phase, and in which solid particles of the bioactive material are dispersed and encapsulated in the continuous solid phase of the encapsulating material, wherein each of the bioactive material and the encapsulating material is normally a solid at room temperature and the melting point of the encapsulating material is lower than the melting point of the bioactive material, the bioactive material being preferably a bisphosphonate, most preferably alendronate, and the encapsulating material includes an enhancer, preferably a mono- or di-glyceride, or an encapsulating surfactant, preferably, a polyoxyethylene/polyoxypropylene block copolymer having surface active properties, and a process for preparing the composition in which solid particles of the bioactive material are mixed with and dispersed in the encapsulating material which is in molten (liquid) form; and cooling the molten form of the encapsulating material to form a solid pharmaceutical composition having the solid particles of the bioactive material dispersed and encapsulated in a continuous solid phase of the encapsulating material.

L'invention concerne une composition pharmaceutique solide comprenant une matière bioactive soluble dans l'eau et une matière d'encapsulage présente dans la composition sous forme de phase solide continue et dans laquelle des particules solides de la matière bioactive sont dispersées et encapsulées dans la phase solide continue de la matière d'encapsulage. La matière bioactive et la matière d'encapsulage sont de manière générale chacune solides à température ambiante et le point de fusion de la matière encapsulée est inférieur à celui de la matière bioactive. Ladite matière bioactive est de préférence un bisphosphonate, et tout spécialement un alendronate et la matière d'encapsulage comprend un renforçateur, de préférence un mono- ou un diglycéride, ou un tensioactif d'encapsulage, de préférence un copolymère greffé polyoxyéthylène/polyoxypropylène ayant des propriétés tensioactives. L'invention concerne en outre un procédé permettant de préparer la composition dans laquelle des particules solides de la matière bioactive sont mélangées avec et dispersées dans la matière d'encapsulage qui se présente sous forme (liquide) fondue. Le procédé permet également de refroidir la forme moulée de la matière d'encapsulage afin de former une composition pharmaceutique solide comportant des particules solides de la matière bioactive dispersées et encapsulées dans une phase solide continue de la matière d'encapsulage.

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