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In Vitro release from reverse poloxamine/α-cyclodextrin matrices: modelling and comparison of dissolution profiles
Eneko Larrañeta1, Cristina Martínez-Ohárriz, Itziar Vélaz
1Departamento de Química y Edafología, Facultad de Ciencias, Universidad de Navarra, Pamplona, Navarra, 31080, Spain.
Biocompatible gels and tablets made from Tetronic 90R4 and alpha-cyclodextrin (α-CD) show sustained drug release. These matrices are effective for delivering both small molecules like L-tryptophan and proteins such as BSA.
Area of Science:
- Materials Science
- Biomedical Engineering
- Polymer Chemistry
Background:
- Octablock star polyethylene oxide/polypropylene oxide copolymers (Tetronic 90R4) and α-cyclodextrin (α-CD) are biocompatible materials.
- These materials can form gels and tablets suitable for drug delivery systems.
Purpose of the Study:
- To evaluate Tetronic 90R4/α-CD gels and tablets as matrices for sustained drug release.
- To investigate the release kinetics of L-tryptophan (Trp) and bovine serum albumin (BSA) from these matrices.
Main Methods:
- Complexation of Tetronic 90R4 with α-CD to form gels.
- Preparation of drug-loaded tablets by freeze-drying the gels.
- In vitro release studies of Trp and BSA from both gel and tablet matrices.
- Mathematical modeling of drug release from tablets.
Main Results:
- Both gel and tablet matrices demonstrated sustained release profiles for Trp and BSA.
- Release of Trp from tablets followed Fickian diffusion.
- Release of BSA from tablets was governed by a combination of diffusion and erosion.
Conclusions:
- Tetronic 90R4/α-CD matrices are effective for sustained drug delivery.
- The matrices can be tailored for controlled release of different types of molecules.
- Understanding the release mechanisms is crucial for optimizing drug delivery systems.
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