Lumata, L., et al., Fast Dissolution Dynamic Nuclear Polarization NMR of 13C-Enriched 89Y-DOTA Complex: Experimental and Theoretical Considerations. Appl. Magn. Reson., 2012. 43(1): p. 69-79.
The yttrium complex of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetra(1′- 13 C-acetic acid) [ 13 C]DOTA was synthesized. Fast dissolution dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) studies revealed that the 89 Y, 13 C, and 15 N nuclei present in the complex could be co-polarized at the same optimum microwave irradiation frequency. The liquid-state spin–lattice relaxation time T 1 of these nuclei were found to be reasonably long to preserve some or most of the DNP-enhanced polarization after dissolution. The hyperpolarized 13 C and 89 Y NMR signals were optimized in different glassing mixtures. The overall results are discussed in light of the thermal mixing model of DNP.