Imaging agents;
Macrocyclic ligands;
Gadolinium;
Relaxivity;
Gd-DOTA;
ALKALINE-EARTH METAL;
FAST WATER EXCHANGE;
COMPLEXES;
GADOLINIUM;
RELAXIVITY;
DESIGN;
SENSITIVITY;
MODULATION;
STABILITY;
LIGANDS;
D O I:
10.1016/j.tet.2014.06.126
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
In the present work a modular pathway towards the synthesis of a new versatile MRI contrast agent is reported and its physico-chemical properties are described. Two different functional groups were attached on two arms of the gadolinium 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetate (DOTA) in order to get a platform able to bind one probe designed to target specific biological marker and a fluorescent molecule likely to be used for optical imaging. The nuclear magnetic relaxation dispersion (NMRD) profile, the oxygen-17 relaxometric NMR study and stability assessment versus transmetalation of the Gd-complex show that this new contrast agent has a relaxivity and transmetalation stability similar to Gd-DOTA. (C) 2014 Elsevier Ltd. All rights reserved.