Phosphonium versus Ammonium Compact Polyelectrolyte Complex Networks with Alginate-Comparing Their Properties and...

Area of Science:

• Polymer Science
• Materials Science
• Supramolecular Chemistry

Background:

• Polyelectrolyte complexes (PECs) are formed from polycations and polyanions.
• Applications include self-healing materials and drug delivery.
• Direct comparison of phosphonium and ammonium PECs is lacking.

Purpose of the Study:

• To synthesize and characterize phosphonium and ammonium PEC networks.
• To compare their physical properties, chemical composition, and self-healing abilities.
• To evaluate their potential for drug delivery applications.

Main Methods:

• Synthesis of PECs using sodium alginate and various phosphonium/ammonium polymers.
• Ultracentrifugation to form compact PECs (CoPECs).
• Characterization of swelling, mechanical properties, drug loading/release, and cytotoxicity.

Main Results:

• Phosphonium polymer networks exhibited higher swelling in phosphate-buffered saline.
• Viscous/elastic moduli and relaxation times were similar for analogous phosphonium and ammonium networks.
• Drug loading capacities ranged from 5-14 w/w % with efficiencies of 29-93%.
• Anion release rates were primarily influenced by anion structure and polycation substituents, not cation type.

Conclusions:

• Cation type (phosphonium vs. ammonium) has a limited impact on PEC mechanical properties and drug release kinetics.
• Both phosphonium and ammonium PECs show promise for drug delivery with tunable loading and release profiles.
• Cytotoxicity is dependent on both network and polycation structure, requiring further investigation.