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Small‐angle X‐ray scattering (SAXS) was used to monitor peptide hydrogelation with and without the MRI contrast agent gadolinium chelate (Gd(III)‐chelate). The gelators are a pair of decapeptides that are self‐repulsive but mutually attractive. Gd(III)‐chelate was either free or covalently bound to one of the decapeptides. Free and conjugated Gd(III)‐chelate have the opposite effects on peptide gelation:...
The hydrogels assembled from a pair of self‐repulsive but mutually attractive decapeptides are visualized by magnetic resonance imaging (MRI). It is found that in the absence of Gd(III)‐chelate, gelation has little effect on MRI signal intensity. In the presence of Gd(III)‐chelate, gelation leads to significant changes in water relaxation and MR signal intensity. The sol to gel transition is best...
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