Meeting Banner
Abstract #1621

T1 Modulation of CEST in a Eu(III)-DOTA-Tetraamide-Bis(Nitroxyl) Complex

James S. Ratnakar1, Subha Viswanathan1, Matthew E. Merritt1, Chien-Yuan Lin1, A. Dean Sherry1, Zoltan Kovacs1

1Advanced Imaging Research Center, UT Southwestern Medical Center, Dallas, TX, United States

The CEST properties of a Eu(III)-DOTA-tetraamide complex having two covalently appended TEMPO (2,2,6,6-(tetramethylpiperidin-1-yl)oxyl) units can be turned on under reducing conditions due to the reduction of the paramagnetic TEMPO moieties to its diamagnetic hydroxylamine derivative.

Keywords

acid addition advanced agent agents alternative anticipated appended applied arms around axial biological blue bound bulk butyl cage certain characteristic chem chemical collected coming complex complexes conditions consequently containing contrast coordinating coordination covalently deactivated dean decreases derivatives design designed determined diamagnetic distinct efficiency efficient electronic equivalents ester even exchange exchanging exhibits exists experimental fast free fully geometry highly hydrolysis illustrated implies includes indicates inefficient influence intensity inversion isomer lanthanide largely ligand longer longitudinal magnetization magnitude many mechanism media medical metal modulated modulation moieties molecule much near negligible paramagnetic peak pendant phantom phantoms platform pool pools preferred preliminary presence probes properties proton protons pulse quenched quite radical radicals rationally reaction recorded recovers recovery reduced reducing reduction report responsive ring sample samples saturated saturation scaffold selective sensitive sherry since slow southwestern spectra spectroscopy spectrum spin spins square substantial summary synthesized system tempo though traditional transfer turned units water yuan