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Investigation of Deteriorated Dissolution of Amorphous Itraconazole: Description of Incompatibility with Magnesium Stearate and Possible Solutions

Démuth, Balázs and Galata, Dorián and Szabó, Edina and Nagy, Brigitta and Farkas, Attila and Balogh, Attila and Hirsch, Edit and Pataki, Hajnalka and Rapi, Zsolt and Bezúr, László and Vigh, Tamás and Verreck, Geert and Szalay, Z. and Demeter, Ádám and Marosi, György and Nagy, Zsombor Kristóf (2017) Investigation of Deteriorated Dissolution of Amorphous Itraconazole: Description of Incompatibility with Magnesium Stearate and Possible Solutions. MOLECULAR PHARMACEUTICS, 14 (11). pp. 3927-3934. ISSN 1543-8384

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Abstract

Disadvantageous crystallization phenomenon of amorphous itraconazole (ITR) occurring in the course of dissolution process was investigated in this work. A perfectly amorphous form (solid dispersion) of the drug was generated by the electroblowing method (with vinylpyrrolidone-vinyl acetate copolymer), and the obtained fibers were formulated into tablets. Incomplete dissolution of the tablets was noticed under the circumstances of the standard dissolution test, after which a precipitated material could be filtered. The filtrate consisted of ITR and stearic acid since no magnesium content was detectable in it. In parallel with dissolution, ITR forms an insoluble associate, stabilized by hydrogen bonding, with stearic acid deriving from magnesium stearate. This is why dissolution curves do not have the plateaus at 100%. Two ways are viable to tackle this issue: change the lubricant (with sodium stearyl fumarate >95% dissolution can be accomplished) or alter the polymer in the solid dispersion to a type being able to form hydrogen bonds with ITR (e.g., hydroxypropyl methylcellulose). This work draws attention to one possible phenomenon that can lead to a deterioration of originally good dissolution of an amorphous solid dispersion.

Item Type: Article
Subjects: R Medicine / orvostudomány > RS Pharmacy and materia medica / gyógyszerészet, gyógyászati eszközök
Depositing User: Dr Attila Balogh
Date Deposited: 26 Sep 2018 09:04
Last Modified: 26 Sep 2018 09:04
URI: http://real.mtak.hu/id/eprint/85348

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