Development of Cetylpyridinium-Alginate Nanoparticles: A Binding and Formulation Study

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Polyelectrolyte-surfactant complexes offer versatile platforms for drug delivery.
• Alginate and cetylpyridinium chloride (CPC) interactions are key to nanoparticle formation.
• Understanding these interactions is crucial for developing effective therapeutic agents.

Purpose of the Study:

• To develop stable polyelectrolyte-surfactant complex nanoparticles using alginate and CPC.
• To investigate the impact of ZnCl2 on nanoparticle formation and properties.
• To evaluate the potential of these nanoparticles for therapeutic applications, specifically in periodontal disease treatment.

Main Methods:

• Utilized a cetylpyridinium cation (CP(+)) selective membrane electrode to analyze CPC binding by alginate.
• Investigated the cooperative binding nature through binding isotherms.
• Characterized nanoparticle properties including size, polydispersity, zeta potential, and morphology.
• Assessed drug entrapment efficiency, loading capacity, and release profiles.

Main Results:

• Demonstrated sigmoidal binding isotherms indicating cooperative interaction between CP(+) and alginate.
• Observed that salts, particularly ZnCl2, weaken interactions and reduce binding cooperativity.
• Formed stable CP-alginate nanoparticles with hydrodynamic diameters of 140-200nm and negative zeta potential.
• Achieved high CPC entrapment efficiency (~94%) and loading capacity (>50%) with prolonged release over 7 days.

Conclusions:

• Stable, spherical CP-alginate nanoparticles were successfully developed.
• The nanoparticles exhibit favorable characteristics for drug delivery, including high entrapment and sustained release.
• These findings suggest a significant potential for these nanoparticles in the treatment of periodontal disease.