Preparation of pregelatinized high amylose starch and...

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A61K 47/36 (2006.01) A61K 9/14 (2006.01) A61K 9/20 (2006.01) A61K 9/22 (2006.01) C08B 30/14 (2006.01) C08B 30/20 (2006.01) C12S 3/12 (2006.01)

Patent

CA 2211778

A process is disclosed for the manufacture of an excipient useful for the controlled release of an active agent. In this process, a starting material consisting of starch or high amylose starch is subjected to a gelatinization in an aqueous medium. When the starting material consists of starch having an amylose content of less than 50% by weight, the gelatinized material is subjected to an enzymatic debranchingtreatment so as to obtain a gelatinized debranched starch having a short amylosechain content of at least 50% by weigh. When the starting material consists of starch having an amylose content of at least 50% by weight or of a high amylose starch having an amylose content up to 80% by weight, the gelatinized material is optionally subjected to an enzymatic debranching treatment so as to obtain a gelatinized debranched starch having a short amylose chain content of 20% to 50%by weight. The so obtained gelatinized and optionally debranched starch is further subjected to a thermal dehydration in order to obtain the requested excipient in form of a powder. Also disclosed is a dosage administration form for the sustained release of one or more active agents in the form of a powder. This form which is preferably a tablet, comprises the active agent(s) in admixture with the above excipient in such an amount as to achieve the requested sustained release.

Divulgation d'un processus de fabrication d'un excipient utile pour la libération prolongée d'un principe actif. Au cours du processus, une matière de départ constituée d'un amidon ou d'amidon riche en amylose est gélatinisée dans un milieu aqueux. Lorsque la matière de départ est de l'amidon contenant moins de 50 % en poids d'amylose, la matière gélatinisée est soumise à une déramification enzymatique de manière à obtenir un amidon déramifié gélatinisé contenant au moins 50 % en poids d'amylose à chaîne courte. Lorsque la matière de départ est de l'amidon contenant au moins 50 % en poids d'amylose ou de l'amidon riche en amylose contenant au plus 80 % en poids d'amylose, la matière gélatinisée est facultativement soumise à une déramification enzymatique de manière à obtenir un amidon déramifié gélatinisé contenant de 20 à 50 % en poids d'amylose à chaîne courte. L'amidon gélatinisé ainsi obtenu et facultativement déramifié est ensuite soumis à une déshydratation thermique afin d'obtenir l'excipient requis sous forme de poudre. On dévoile aussi une forme d'administration de la posologie pour la libération prolongée d'un ou de plus d'un principe actif sous la forme d'une poudre. Cette forme, qui est de préférence un comprimé, comprend le(s) principe(s) actif(s) en mélange avec l'excipient susmentionné dans une quantité faisant en sorte d'obtenir la libération prolongée recherchée.

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