Abstract
Multimodal contrast agents with high biocompatibility and biodegradability, as well as low material complexity, are in great demand for clinical diagnostics at different scales of resolution and/or for translating preclinical diagnosis into intraoperative imaging. Multimodality, however, often results in multicomponent and multistructured materials with complexity becoming a severe restriction for synthesis, approval, and use in routine clinical practice. Here, we present sulfonate-based saline [GdO]+[ICG]− (ICG, indocyanine green) inorganic-organic hybrid nanoparticles (IOH-NPs with an inorganic [GdO]+ cation and an organic [ICG]− anion) as a novel, multimodality contrast agent for optical, photoacoustic, and magnetic resonance imaging (OI, PAI, MRI). [GdO]+[ICG]− IOH-NPs have a plain composition based on clinically used constituents and are prepared as an insoluble saline compound in water. The high [ICG]− content (81 wt %) ensures intense near-infrared emission (780–840 nm) and a strong photoacoustic s...
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