Protein-polymer functionalized aqueous ferrofluids showing high T2 relaxivity.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Biophysics

Background:

• Superparamagnetic iron oxide nanoparticles (SPIONs) are crucial for biomedical applications.
• Controlling SPIONs' size, shape, and dispersibility is essential for their efficacy.
• Previous ferrofluid formulations faced limitations in magnetization and stability.

Purpose of the Study:

• To synthesize stable ferrofluids with enhanced magnetization using a biomimetic approach.
• To investigate the role of protein-polymer interactions in SPIONs' organization and stability.
• To evaluate the in vivo performance of the developed ferrofluids as contrast agents.

Main Methods:

• Synthesis of SPIONs within a collagen, bovine serum albumin, and poly(vinyl) alcohol matrix.
• Utilizing a biomimetic self-assembly process for nanoparticle encapsulation.
• Characterization using dynamic light scattering and evaluation of magnetic properties.
• In vivo imaging studies in mice liver.

Main Results:

• Achieved controlled size, shape, and dispersibility of SPIONs in a stable ferrofluid.
• Demonstrated SPION formation within self-assembling protein-polymer clusters.
• Increased magnetization by threefold compared to previous formulations.
• Observed high transverse relaxivity and good contrast enhancement in mice liver.

Conclusions:

• The biomimetic synthesis offers a robust method for creating high-performance SPIONs.
• Protein-polymer interactions are key to nanoparticle stability and organization.
• The developed ferrofluids show significant potential as advanced contrast agents for in vivo imaging.