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Polymetallic macromolecules are potential contrast agents of improved efficiency
F Cavagna1, C Luchinat, A Scozzafava
1Bracco S.p.A., Milano, Italy.
Magnetic Resonance in Medicine
|January 1, 1994
Summary
Polyaspartate binds many gadolinium ions, creating solutions with much higher water proton relaxivity than current MRI contrast agents. These macromolecular complexes offer improved efficiency and metal/ligand ratios.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Radiology
Background:
- Gadolinium(III) complexes are widely used as MRI contrast agents.
- Improving the relaxivity and metal/ligand ratio of contrast agents is an ongoing research goal.
Purpose of the Study:
- To investigate the gadolinium(III) binding capacity of polyaspartate.
- To evaluate the water proton relaxivity of polyaspartate-gadolinium(III) complexes.
- To compare the properties of these macromolecular complexes with existing contrast agents.
Main Methods:
- Synthesis and characterization of polyaspartate.
- Quantitative binding studies of gadolinium(III) ions to polyaspartate in solution.
- Measurement of water proton relaxivity of the resulting solutions.
Main Results:
- Polyaspartate quantitatively binds up to 40 mol Gd3+ ions per mole of polyaspartate.
- The resulting solutions exhibit significantly higher water proton relaxivity compared to clinical and investigational gadolinium(III) complexes.
- Polymetallic macromolecular complexes demonstrate high relaxing efficiency and a favorable metal/ligand mass ratio.
Conclusions:
- Polyaspartate is an effective macromolecular ligand for forming high-relaxivity gadolinium(III) complexes.
- These novel complexes show promise for enhanced MRI contrast applications.
- The findings suggest a new class of MRI contrast agents with improved performance characteristics.