Abstract:
:Gold nanoparticles coated by gadolinium (III) chelates (Au@DTDTPA) where DTDTPA is a dithiolated bisamide derivative of diethylenetriamine-N,N,N',N'',N''-pentaacetic acid (DTPA), constituted contrast agents for both X-ray computed tomography and magnetic resonance imaging. In an MRI context, highly stable Gd(3+) complexes are needed for in vivo applications. Thus, knowledge of the thermodynamic stability and kinetic inertness of these chelates, when grafted onto gold nanoparticles, is crucial since bisamide DTPA chelates are usually less suited for Gd(3+) coordination than DTPA. Therefore, these parameters were evaluated by means of potentiometric titrations and relaxivity measurements. The results showed that, when the chelates were grafted onto the nanoparticle, not only their thermodynamic stability but also their kinetic inertness were improved. These positive effects were correlated to the chelate packing at the nanoparticle surface that stabilized the corresponding Gd(3+) complexes and greatly enhanced their kinetic inertness.
journal_name
Contrast Media Mol Imagingjournal_title
Contrast media & molecular imagingauthors
Mogilireddy V,Déchamps-Olivier I,Alric C,Laurent G,Laurent S,Vander Elst L,Muller R,Bazzi R,Roux S,Tillement O,Chuburu Fdoi
10.1002/cmmi.1616subject
Has Abstractpub_date
2015-05-01 00:00:00pages
179-87issue
3eissn
1555-4309issn
1555-4317journal_volume
10pub_type
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