Synthesis and Characterization of BaSO

Area of Science:

• Biomaterials Science
• Nanotechnology
• Medical Imaging

Background:

• Microcomputed tomography (micro-CT) is crucial for differentiating vascular networks from tissues with similar X-ray attenuation.
• Current clinical X-ray contrast agents utilize microscale barium sulfate (BaSO4) particles.

Purpose of the Study:

• To develop and characterize a novel nanoscale composite contrast agent for improved medical perfusion and vascular imaging.
• To create a barium sulfate (BaSO4) and calcium carbonate (CaCO3) nanoparticle-alginate gel with enhanced performance over existing microscale agents.

Main Methods:

• Synthesized BaSO4 and CaCO3 nanoparticles using a polyol method with tetraethylene glycol.
• Encapsulated nanoparticles within an alginate gel matrix to create a nanocomposite contrast agent.
• Controlled gelation time using d-(+)-gluconic acid δ-lactone and minimized rapid cross-linking by Ba2+ through surface sulfate excess on BaSO4 nanoparticles.

Main Results:

• The resulting BaSO4-CaCO3 nanoparticle alginate gel exhibited good colloidal stability, viscosity control, and final gel stiffness.
• Achieved controlled gelation times between 30 and 35 minutes, suitable for full-body perfusion.
• Characterized mechanical properties including storage modulus, peak stress, elastic modulus, and radiodensity.

Conclusions:

• This study presents the first nanoscale composite of a radiopaque metal salt integrated with an alginate hydrogel for medical applications.
• The developed nanocomposite demonstrates superior potential for vascular imaging and micro-CT applications compared to microscale agents.