Gadolinium
content in AGD was determined by metal analysis at Galbraith Laboratories,
Inc. (Knoxville, TN)
To
determine the relaxivity (1/T1), inversion-recovery
experiments were performed on AGD solutions of varying concentrations
(0.0065 mM to 0.09 mM) using a 4.7 T 200 MHz Bruker NMR Spectrometer
at Wellesley College