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Aqueous, Heterogeneous Parahydrogen-Induced N Polarization. | LitMetric
The successful transfer of parahydrogen-induced polarization to N spins using heterogeneous catalysts in aqueous solutions was demonstrated. Hydrogenation of a synthesized unsaturated N-labeled precursor (neurine) with parahydrogen (p-H) over Rh/TiO heterogeneous catalysts yielded a hyperpolarized structural analog of choline. As a result, N polarization enhancements of over two orders of magnitude were achieved for the N-ethyl trimethyl ammonium ion product in deuterated water at elevated temperatures. Enhanced N NMR spectra were successfully acquired at 9.4 T and 0.05 T. Importantly, long hyperpolarization lifetimes were observed at 9.4 T, with a N of ~6 min for the product molecules, and the of the deuterated form exceeded 8 min. Taken together, these results show that this approach for generating hyperpolarized species with extended lifetimes in aqueous, biologically compatible solutions is promising for various biomedical applications.
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