Core-shell polygalacturonate magnetic iron oxide nanoparticles: Synthesis, characterization, and functionalities

Area of Science:

• Materials Science
• Nanotechnology
• Biomaterials

Background:

• Development of novel magnetic nanoparticles for environmental and biomedical applications is crucial.
• Polygalacturonic acid (polyGalA) offers functional groups for surface modification and controlled release.
• Iron oxide nanoparticles (INPs) provide magnetic properties for targeted applications.

Purpose of the Study:

• To synthesize polygalacturonate-based magnetic iron oxide nanoparticles (INP-polyGalA).
• To characterize the synthesized INP-polyGalA for their physical, chemical, and magnetic properties.
• To explore potential applications in water pollution control and drug delivery.

Main Methods:

• Synthesis of INP-polyGalA via diffusion of Fe2+ and Fe3+ through polyGalA solution.
• Characterization using Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), and X-ray Diffraction (XRD).
• Analysis of surface charge and functional groups (carboxylate, carboxylic) using IR mapping.

Main Results:

• Synthesized INP-polyGalA nanoparticles (10-50 nm) with ~45% polyGalA content and negative surface charge (pH 2-7).
• Confirmed formation of magnetite (Fe3O4) exhibiting magnetic properties.
• PolyGalA located in the core and on the surface, with accessible carboxylate and carboxylic groups.

Conclusions:

• INP-polyGalA nanoparticles are successfully synthesized with tunable properties.
• The functionalized nanoparticles can bind methylene blue for potential water remediation.
• Hydrogel beads formed via ionotropic gelation enable magnetic-field-triggered release of encapsulated molecules.