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Cationic stearylamine-containing biodegradable microparticles for DNA delivery.
C Kusonwiriyawong1, K Atuah, O H Alpar
1Institute for Pharmaceutical Sciences, Swiss Federal Institute of Technology Zurich (ETH), Winterthurerstrasse 190 CH-8057, Zurich, Switzerland. chirasak@rangsit.rsu.ac.th
Journal of Microencapsulation
|January 14, 2004
Summary
Researchers developed cationic stearylamine (SA)-containing microparticles for drug delivery. These biodegradable microparticles efficiently carry negatively charged therapeutics like DNA, showing controlled release over 4 weeks.
Area of Science:
- Biomaterials Science
- Drug Delivery Systems
- Nanotechnology
Background:
- Developing effective drug delivery systems is crucial for enhancing therapeutic efficacy, especially for charged molecules.
- Biodegradable polymers like poly(lactide) and poly(lactide-co-glycolide) are widely used in drug delivery applications.
- Cationic materials are being explored to improve the loading and delivery of negatively charged therapeutics.
Purpose of the Study:
- To investigate the technical aspects of preparing novel cationic stearylamine (SA)-containing microparticles.
- To evaluate these microparticles as a potential drug delivery system for negatively charged therapeutics.
- To characterize the physical properties and drug loading/release profiles of the SA microparticles.
Main Methods:
- Preparation of cationic microparticles using poly(lactide) and poly(lactide-co-glycolide) with stearylamine (SA) via solvent evaporation and spray-drying.
- Characterization of particle size, re-dispersibility, and uniformity.
- Adsorption studies using circular plasmid DNA and linear salmon DNA.
- Preliminary investigation of DNA release kinetics from spray-dried SA microparticles.
Main Results:
- Successfully prepared cationic SA-containing microparticles with controllable sizes (1-10 µm and 50-100 µm).
- Incorporation of SA improved particle characteristics, including re-dispersibility and size uniformity.
- Efficient adsorption of both plasmid and salmon DNA onto the cationic microparticle surfaces was achieved.
- Preliminary release studies showed an initial burst release followed by a sustained release phase exceeding 4 weeks.
Conclusions:
- Cationic SA microparticles are a viable formulation for delivering negatively charged therapeutics.
- The preparation methods (solvent evaporation, spray-drying) allow for tunable particle characteristics.
- These microparticles demonstrate potential for improving the efficacy of DNA and protein-based therapeutics.