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Fractal analysis of sodium cholate particles
A Fini1, G Fazio, M J Fernández-Hervás
1Facoltà di Farmacia, Istituto di Scienze Chimiche, Bologna, Italy.
Journal of Pharmaceutical Sciences
|September 1, 1996
Summary
Fractal analysis revealed sodium cholate particle surface roughness impacts dissolution. Surfactant properties significantly influence solid particle dissolution, overriding surface defects.
Area of Science:
- Materials Science
- Physical Chemistry
- Surface Science
Background:
- Sodium cholate is a bile salt with surfactant properties.
- Particle morphology and surface characteristics can influence dissolution rates.
- Understanding these relationships is crucial for pharmaceutical and chemical applications.
Purpose of the Study:
- To investigate the fractal characteristics of sodium cholate powder particles.
- To correlate particle surface roughness with dissolution behavior.
- To elucidate the role of surfactant properties in sodium cholate dissolution.
Main Methods:
- Fractal analysis was applied to two distinct sodium cholate samples.
- Scanning electron microscopy (SEM) was used to visualize particle morphology.
- Dissolution rates were measured and analyzed using reactive dimension.
Main Results:
- A commercial sodium cholate sample exhibited highly irregular, agglomerated particles with high surface fractal dimension (2.98).
- Recrystallized sodium cholate showed large, regular particles with smooth surfaces and a lower fractal dimension.
- Both samples displayed similar, high reactive dimension values for dissolution (2.96 and 2.76), indicating rapid dissolution.
Conclusions:
- Particle surface roughness, as indicated by fractal dimension, did not impede dissolution.
- The inherent surfactant behavior of sodium cholate is a dominant factor in its dissolution process.
- Sodium cholate's surfactant properties effectively level surface defects during dissolution.