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Vitamin A-loaded solid lipid nanoparticles for topical use: drug release properties
V Jenning1, M Schäfer-Korting, S Gohla
1Department of Pharmaceutics, Biopharmaceutics and Biotechnology, Free University of Berlin, Kelchstr. 31, D-12169, Berlin, Germany.
Summary
Solid lipid nanoparticles (SLN) offer tunable drug release for dermal applications. Vitamin A loaded SLN showed controlled release, with release rates adjustable via formulation and polymorphic transitions.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Dermal Drug Delivery
Background:
- Solid lipid nanoparticles (SLN) suspensions exhibit both burst and sustained release profiles, valuable for dermal applications.
- Burst release can enhance drug penetration, while sustained release is crucial for irritating active ingredients or prolonged therapeutic effects.
- Glyceryl behenate SLN loaded with vitamin A were investigated for their release characteristics in various topical formulations.
Purpose of the Study:
- To evaluate the release kinetics of vitamin A from glyceryl behenate SLN in dispersions and topical formulations.
- To correlate drug release rates with the polymorphic transitions of SLN.
- To explore methods for controlling drug release from SLN for topical delivery.
Main Methods:
- Vitamin A loaded glyceryl behenate SLN were prepared and characterized.
- Release profiles were assessed using Franz diffusion cells over 24 hours for SLN dispersions and formulated products (hydrogels, creams).
- Polymorphic transitions of SLN were analyzed and correlated with drug release patterns.
Main Results:
- SLN dispersions showed controlled release within the first 6 hours, with accelerated release between 12-24 hours, exceeding nanoemulsions.
- Topical formulations (hydrogels, creams) demonstrated controlled release over 12-18 hours, with increased release rates at later time points.
- A strong correlation was observed between drug release and SLN polymorphic transitions, particularly the beta' polymorph, influencing drug expulsion.
Conclusions:
- The release rate of vitamin A from glyceryl behenate SLN is adjustable for topical applications.
- Polymorphic transitions, specifically the transformation to the beta(i) form, significantly impact drug release, which can be managed through formulation strategies.
- SLN can be effectively incorporated into various topical dosage forms, offering tunable drug release profiles for enhanced dermal therapy.