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Performance evaluation of PAMAM dendrimer based simvastatin formulations
Hitesh Kulhari1, Deep Pooja, S K Prajapati
1Institute of Pharmacy, Bundelkhand University, Jhansi, UP 284128, India. kulhari.h@gmail.com
International Journal of Pharmaceutics
|December 15, 2010
Summary
Poly(amidoamine) dendrimers enhanced simvastatin solubility and provided controlled drug release. PEGylated dendrimers offered the longest drug release, up to 5 days, and amine dendrimers showed the best stability.
Area of Science:
- Nanotechnology
- Materials Science
- Pharmaceutical Sciences
Background:
- Dendrimers are highly branched macromolecules with tunable properties.
- Poly(amidoamine) (PAMAM) dendrimers are widely studied as drug delivery vehicles.
- Surface functionalization of dendrimers can significantly impact their performance.
Purpose of the Study:
- To evaluate PAMAM dendrimers with different surface groups (amine, hydroxyl, PEGylated) as drug carriers for simvastatin.
- To investigate the impact of dendrimer surface chemistry on solubility, dissolution, in vitro drug release, and stability of drug-dendrimer complexes.
Main Methods:
- Preparation and characterization of simvastatin-dendrimer complexes.
- Solubility and dissolution studies.
- In vitro drug release assays.
- Fourier-transform infrared spectroscopy (FTIR) for complex characterization.
- Accelerated stability studies under various storage conditions.
Main Results:
- Maximum solubility enhancement of simvastatin was achieved with PEGylated dendrimers (33-fold), followed by amine (23-fold) and hydroxyl (17.5-fold) dendrimers.
- Simvastatin release from PEGylated dendrimer complexes extended up to 5 days, compared to 5 hours for pure simvastatin and 24 hours for non-PEGylated dendrimers.
- Amine dendrimer formulations exhibited optimal stability in the dark at low temperatures (0°C), while PEGylated dendrimer formulations were most stable in the dark at room temperature (RT).
Conclusions:
- PAMAM dendrimers, particularly PEGylated and amine-functionalized ones, are effective carriers for enhancing simvastatin solubility and achieving sustained drug release.
- The surface chemistry of dendrimers plays a crucial role in determining drug loading, release kinetics, and formulation stability.
- Optimized storage conditions are essential for maintaining the stability and efficacy of dendrimer-based drug delivery systems.
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