Development of Pd-Loaded Hf-Based Metal-Organic Framework as a Dual-Modal Contrast Agent for Photoacoustic Imaging...

Area of Science:

• Nanotechnology
• Biomedical Imaging
• Materials Science

Background:

• Noninvasive cancer imaging is crucial for diagnostics, offering structural and functional tumor information.
• Developing advanced contrast agents is essential for improving imaging sensitivity and specificity.

Purpose of the Study:

• To explore palladium nanoparticles loaded hafnium-based metal-organic framework (Pd@Hf-EDB) as a dual-modal contrast agent.
• To evaluate the efficacy of Pd@Hf-EDB for computed tomography (CT) and photoacoustic imaging (PAI) in cancer diagnostics.

Main Methods:

• Synthesis and characterization of Pd@Hf-EDB nanoparticles using techniques like X-ray diffraction, SEM, TEM, DLS, and EDS.
• In vitro studies involving cellular uptake verification by soft X-ray tomography in BxPC-3 tumor cells.
• Comparative performance evaluation against traditional agents (Iohexol) and gold nanorods in vitro and in vivo xenograft models.

Main Results:

• Successful synthesis and characterization of Pd@Hf-EDB nanoparticles confirmed.
• Demonstrated superior CT imaging performance compared to Iohexol.
• Exhibited broad UV-vis/NIR absorption and enhanced PAI capabilities over gold nanorods.
• In vivo studies showed significant contrast enhancement in tumors, validating dual-modal imaging potential.

Conclusions:

• Pd@Hf-EDB is an efficient dual-modal contrast agent for CT and PAI.
• The material's unique composition (high-Z Hf-MOF, Pd nanoparticles, H2EDB linkers) enables synergistic imaging capabilities.
• Pd@Hf-EDB shows great promise for noninvasive cancer diagnostics.