Journal
INTERNATIONAL JOURNAL OF PHARMACEUTICS
Volume 381, Issue 2, Pages 184-191Publisher
ELSEVIER
DOI: 10.1016/j.ijpharm.2009.03.002
Keywords
Solid lipid extrusion; Glycerides; Polymorphism; Dissolution; Physical stability; Solid-state behaviour
Categories
Funding
- Marie Curie Fellowship
- Galenos Network [MEST-CT-2004-404992]
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A monoacid triglyceride and a partial glyceride were extruded below their melting ranges alone and together in different mixture ratios to investigate the influence of the chemical composition of the lipid matrix on the solid-state properties and dissolution characteristics. The partial glyceride exhibits a faster release of the drug compared to the triglyceride due to its surfactant properties. The lipid mixtures show rather complex solid-state behaviour and hence unexpected dissolution characteristics. Adding 10% (w/w) partial glyceride to a triglyceride matrix led to increased incidence of the unstable alpha-form of the triglyceride leading to recrystallization of the stable beta-form over time which causes fractal structures on the extrudate surface which decrease the dissolution rate. Adding 50% (w/w) partial glyceride to the triglyceride matrix also results in tristearin alpha-formation subsequently followed by recrystallization to the beta-form. But as 50% of the matrix consists of the partial glyceride the dissolution rate was faster than the rate obtained by pure triglyceride or the 9 + 1 (w/w) mixture of triglyceride and partial glyceride. The results of this study help in understanding the complex solid-state behaviour of solid lipid extrudates with different composition and to manufacture suitable lipid-based oral dosage forms. (C) 2009 Elsevier B.V. All rights reserved.
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