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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
Published on: August 28, 2015
Controlled drug release system based on cyclodextrin-conjugated poly(lactic acid)-b-poly(ethylene glycol) micelles
1College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
International Journal of Pharmaceutics
|January 19, 2013
Summary
Cyclodextrin-conjugated poly(lactic acid)-b-poly(ethylene glycol) (β-CD-PLA-mPEG) micelles offer enhanced drug loading and controlled release for hydrophobic drugs. This biocompatible system shows low toxicity and promises improved drug delivery applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Drug Delivery Systems
Background:
- Developing effective drug delivery systems for hydrophobic drugs remains a challenge.
- Amphiphilic copolymers are explored for their self-assembly properties in aqueous solutions.
- Controlled release profiles and biocompatibility are crucial for therapeutic applications.
Purpose of the Study:
- To synthesize and characterize cyclodextrin-conjugated poly(lactic acid)-b-poly(ethylene glycol) (β-CD-PLA-mPEG) copolymer.
- To evaluate the self-assembly behavior and drug loading capacity of the β-CD-PLA-mPEG micelles.
- To assess the drug release kinetics, particle size, morphology, and cytotoxicity of the developed micelles.
Main Methods:
- Synthesis of β-CD-PLA-mPEG via controlled ring-open copolymerization and click coupling.
- Micelle formation in aqueous solution and characterization of particle size (Dynamic Light Scattering).
- Drug loading with indomethacin (IND) and evaluation of drug loading efficiency and release profiles.
- Transmission Electron Microscopy (TEM) for morphology assessment and in vitro cytotoxicity assays.
Main Results:
- β-CD-PLA-mPEG copolymer self-assembled into micelles with a mean particle size of 173.4 nm.
- Drug-loaded micelles (IND-loaded) showed a reduced particle size of 159.2 nm and spherical morphology.
- β-CD-PLA-mPEG micelles exhibited higher drug loading efficiency and improved control over initial burst release compared to PLA-mPEG micelles.
- The copolymer demonstrated low cytotoxicity, indicating good biocompatibility.
Conclusions:
- β-CD-PLA-mPEG copolymer effectively forms stable micelles suitable for hydrophobic drug delivery.
- The cyclodextrin conjugation enhances drug loading efficiency and provides superior control over drug release kinetics.
- These β-CD-PLA-mPEG micelles represent a promising biocompatible platform for the controlled delivery of various hydrophobic drugs.
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