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Polyphosphate Poly(amine) Nanoparticles: Self-Assembly, Thermodynamics, and Stability Studies
Victor Ezequiel Cuenca1, Hernan Martinelli1, Maria de Los Angeles Ramirez2
1Instituto de Física del Sur (IFISUR), Departamento de Física , Universidad Nacional del Sur (UNS), CONICET , Av. L. N. Alem 1253 , B8000CPB Bahía Blanca , Argentina.
Langmuir : the ACS Journal of Surfaces and Colloids
|October 10, 2019
Summary
Researchers explored polyamine phosphate nanoparticle (PAN) formation using various phosphate salts. Findings reveal tunable pH stability for PANs, suggesting potential in drug delivery systems.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Chemistry
Background:
- Polyamine phosphate nanoparticles (PANs) are synthesized using poly(allylamine hydrochloride) and various sodium phosphate salts.
- Understanding the formation and properties of PANs is crucial for their application in fields like drug delivery.
Purpose of the Study:
- To investigate the interaction between poly(allylamine hydrochloride) and different phosphate salts (monophosphate to polyphosphate).
- To characterize the formation, stability, and pH sensitivity of the resulting polyamine phosphate nanoparticles (PANs).
- To explore the potential of tailoring PAN properties by selecting specific phosphate salts for drug delivery applications.
Main Methods:
- Dynamic light scattering (DLS) and electrophoretical mobility measurements for size and stability.
- Isothermal titration calorimetry (ITC) to analyze binding interactions.
- Atomic force microscopy (AFM) and transmission electron microscopy (TEM) for morphological characterization.
Main Results:
- Optimal concentrations for stable PAN formation were identified for each phosphate salt.
- Minimal phosphate ion concentration for PAN formation decreased with increasing phosphate chain length.
- ITC revealed distinct endothermic peaks for polyphosphates, absent for monophosphates.
- PAN pH stability varied with phosphate salt type; shorter phosphates were stable at pH 8-9, longer ones at more acidic pH.
Conclusions:
- Phosphate salt selection critically influences PAN formation, stability, and pH responsiveness.
- Tunable pH sensitivity of PANs can be achieved by varying the phosphate counter-ion.
- These findings offer promising avenues for developing advanced drug delivery systems with controlled release profiles.
