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Self-assembled polyelectrolyte nanocomplexes between chitosan derivatives and enoxaparin.
1Shenyang Pharmaceutical University, Shenyang, China.
Summary
Chitosan derivative and enoxaparin polyelectrolyte complexes (PECs) were created, showing pH, ratio, and chitosan modification influence stability and properties. Optimized PECs achieved 90% drug encapsulation efficiency for potential oral delivery.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Drug Delivery
Background:
- Chitosan derivatives and enoxaparin are key components for developing novel drug delivery systems.
- Understanding polyelectrolyte complex (PEC) formation is crucial for optimizing nanoparticle characteristics.
Purpose of the Study:
- To prepare and characterize polyelectrolyte complexes (PECs) from chitosan derivatives and enoxaparin.
- To investigate parameters influencing PEC formation, stability, and physicochemical properties.
Main Methods:
- Dynamic light scattering (DLS) and laser doppler anemometry (LDA) for size and charge analysis.
- Atomic force microscopy (AFM) for surface morphology observation.
- Systematic variation of pH, polymer/enoxaparin ratio, and chitosan modification.
Main Results:
- Soluble, spherical PECs (200-500 nm) formed at pH 3.0-6.5 with ~90% drug encapsulation.
- Ionic strength induced dissociation, while chitosan thiolation, methylation, and PEGylation enhanced stability.
- Chitosan derivatives allowed tunable physicochemical properties of the resulting PECs.
Conclusions:
- PEC formation is driven by electrostatic interactions between chitosan derivatives and enoxaparin.
- Chitosan modification significantly impacts PEC stability and properties, offering potential for tailored drug delivery.
- Further in vivo studies will assess the oral absorption of these polyelectrolyte nanocomplexes.
