Hot Melt Extrusion versus Spray Drying: Hot Melt Extrusion Degrades Albendazole.
DRUG DEVELOPMENT AND INDUSTRIAL PHARMACY(2017)
摘要
The purpose of this study was to enhance the dissolution properties of albendazole (ABZ) by the use of amorphous solid dispersions. Phase diagrams of ABZ-polymer binary mixtures generated from Flory-Huggins theory were used to assess miscibility and processability. Forced degradation studies showed that ABZ degraded upon exposure to hydrogen peroxide and 1 N NaOH at 80 degrees C for 5min, and the degradants were albendazole sulfoxide (ABZSX), and ABZ impurity A, respectively. ABZ was chemically stable following exposure to 1 N HCl at 80 degrees C for one hour. Thermal degradation profiles show that ABZ, with and without Kollidon VR VA 64, degraded at 180 degrees C and 140 degrees C, respectively, which indicated that ABZ could likely be processed by thermal processing. Following hot melt extrusion, ABZ degraded up to 97.4%, while the amorphous ABZ solid dispersion was successfully prepared by spray drying. Spray-dried ABZ formulations using various types of acids (methanesulfonic acid, sulfuric acid and hydrochloric acid) and polymers (Kollidon (R) VA 64, Soluplus (R) and Eudragit (R) E PO) were studied. The spray-dried ABZ with methanesulfonic acid and Kollidon VR VA 64 substantially improved non-sink dissolution in acidic media as compared to bulk ABZ (8-fold), physical mixture of ABZ: Kollidon VR VA 64 (5.6-fold) and ABZ mesylate salt (1.6-fold). No degradation was observed in the spray-dried product for up to six months and less than 5% after one-year storage. In conclusion, amorphous ABZ solid dispersions in combination with an acid and polymer can be prepared by spray drying to enhance dissolution and shelf-stability, whereas those made by melt extrusion are degraded.
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关键词
Albendazole,degradation,amorphous solid dispersions,hot melt extrusion,spray drying,Flory-Huggins theory
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