Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 1, Issue 5, Pages 639-645Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2tb00283c
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For clear MR imaging of blood vessels, a long blood circulation time of effective T-1 contrast agents is necessary. Nanoparticulate MR contrast agents are much more effective owing to their enhanced relaxivity, a result of reduced tumbling rates, and large payloads of active magnetic species. PEGylated yolk-shell silica nanospheres containing high payloads of Gd(III) with cross-linking ligands are synthesized and evaluated as a blood-pool magnetic resonance contrast agent. The hydrophilic PEG coating and the microporous silica shell allow water exchange while keeping the multi-nuclear Gd species from leaching out. These Gd(III)-containing yolk-shell silica nanoparticles with PEGylated surfaces give excellent resolution and contrast in magnetic resonance angiography images of vasculature in rat brains.
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