Multivariate Statistical Optimization of a Modified Protocol of the Ionic Polyelectrolyte Pre-Gelation Method to...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery Systems

Background:

• Alginate (ALG) and chitosan (CS) are key biomaterials for forming ionically-crosslinked nanosystems and polyelectrolyte complexes.
• These materials are crucial in developing effective drug delivery systems due to their biocompatibility and mild processing conditions.

Purpose of the Study:

• To develop and optimize a modified ionic-polyelectrolyte-pre-gelation method for producing alginate-chitosan nanoparticles (NPs).
• To mathematically investigate the influence of process parameters on NP properties, including polydispersity, surface charge, and encapsulation efficiency.
• To establish optimal conditions for achieving desired NP characteristics for drug delivery applications.

Main Methods:

• A modified ionic-polyelectrolyte-pre-gelation method involving controlled reagent addition and sonication was employed.
• A two-phase-design-of-experiment (DOE) approach was utilized for mathematical modeling and optimization.
• Key parameters studied included concentrations of ALG, CS, and CaCl2, ALG:CS ratio, and CS flow rate.

Main Results:

• Concentrations of ALG, CS, CaCl2, ALG:CS ratio, and CS flow rate significantly impacted NP polydispersity (PDI) and encapsulation efficiency (EE%).
• Optimized conditions yielded a minimum PDI of 0.168 or a maximum EE% of 86.7%.
• Particle surface charge could be tuned from highly negative (-67.8 mV) to positive (+21.1 mV) by adjusting the ALG:CS mass ratio.
• NP size, ranging from 144.0 to 1965.0 nm, was primarily dependent on CS and CaCl2 concentrations.

Conclusions:

• The developed method allows for controlled production of alginate-chitosan nanoparticles with tunable properties.
• Mathematical modeling using DOE provides a robust framework for optimizing NP characteristics for specific drug delivery requirements.
• The ability to control particle size and surface charge broadens the potential applications of these NPs in advanced drug delivery systems.