In September 2026, 28, a research group at Kyushu University presented a new water-soluble and completely metal-free molecule. It is capable of simultaneously providing fluorescence imaging and serving as a contrast agent for MRI.
The scientists modified the luminescent organic radical tris(2,4,6-trichlorophenyl) methyl (TTM), giving it solubility in water. In an aqueous medium, the molecule emits deep red light upon fluorescence.
In phantom tests, the new MRI agent enhanced image contrast by a factor of 2,5–4,5 compared with previously known water-soluble TTM radicals. This opens the way to safer and more multifunctional diagnostic tools.
The metal-free composition reduces the toxicity risks characteristic of traditional gadolinium-containing contrasts. The molecule combines optical and magnetic resonance properties in a single structure.
The results were published in the journal Advanced Science. The study was supported by the Japan Society for the Promotion of Science, the Japan Science and Technology Agency, and other foundations.
How will this discovery affect everyday clinical practice in the coming years?
Scientists are still continuing optimization, but it is already clear: such an agent could simplify combined studies, where fluorescence helps in real time and MRI helps in deep tissue imaging.
