Abstract
Microparticles of chitosan (CHT) containing alendronate sodium (AL) were prepared in four drug:polymer ratios (1:1, 1:2, 1:4, 1:6) using the spray drying technique. The efficiency of the method was evaluated by determining production yield (about 70 %) and microencapsulation efficiency, which was almost 100 % in the case of all four of the formulations studied. Particles had a mean size of between 3.6 and 4.6 μm, and a near-spherical shape. The formulations with the highest content of AL (drug:polymer ratio 1:1 and 1:2) showed an asymmetrical distribution of particles, which were larger in size, and had a higher proportion of irregular particles than the other formulations. FT-IR analysis revealed an ionic interaction between AL and CHT. Differential scanning calorimetry and thermogravimetric analysis confirmed the microencapsulation of AL and the increased thermal stability of encapsulated AL. The dissolution profiles of AL from CHT microspheres, at pH values of 1.2 and 6.8, showed a delayed release of AL from microspheres, and the dissolution rate was dependent on the pH and the drug:polymer ratio. It can be concluded that spray drying is a suitable technique for preparing AL-loaded CHT microspheres, and that the drug:polymer ratio can be used to control the rate of AL release from microspheres.
Keywords: Alendronate sodium, chitosan, microparticles, spray drying
Medicinal Chemistry
Title: Preparation and Characterisation of Alendronate-Loaded Chitosan Microparticles Obtained Through the Spray Drying Technique
Volume: 5 Issue: 2
Author(s): Lacramioara Ochiuz and Jose-Esteban Peris
Affiliation:
Keywords: Alendronate sodium, chitosan, microparticles, spray drying
Abstract: Microparticles of chitosan (CHT) containing alendronate sodium (AL) were prepared in four drug:polymer ratios (1:1, 1:2, 1:4, 1:6) using the spray drying technique. The efficiency of the method was evaluated by determining production yield (about 70 %) and microencapsulation efficiency, which was almost 100 % in the case of all four of the formulations studied. Particles had a mean size of between 3.6 and 4.6 μm, and a near-spherical shape. The formulations with the highest content of AL (drug:polymer ratio 1:1 and 1:2) showed an asymmetrical distribution of particles, which were larger in size, and had a higher proportion of irregular particles than the other formulations. FT-IR analysis revealed an ionic interaction between AL and CHT. Differential scanning calorimetry and thermogravimetric analysis confirmed the microencapsulation of AL and the increased thermal stability of encapsulated AL. The dissolution profiles of AL from CHT microspheres, at pH values of 1.2 and 6.8, showed a delayed release of AL from microspheres, and the dissolution rate was dependent on the pH and the drug:polymer ratio. It can be concluded that spray drying is a suitable technique for preparing AL-loaded CHT microspheres, and that the drug:polymer ratio can be used to control the rate of AL release from microspheres.
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Cite this article as:
Ochiuz Lacramioara and Peris Jose-Esteban, Preparation and Characterisation of Alendronate-Loaded Chitosan Microparticles Obtained Through the Spray Drying Technique, Medicinal Chemistry 2009; 5 (2) . https://dx.doi.org/10.2174/157340609787582963
DOI https://dx.doi.org/10.2174/157340609787582963 |
Print ISSN 1573-4064 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6638 |
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