Paramagnetic metal ion impurities which seriously perturb the spin–lattice relaxation times of the C-2 and C-4 protons of imidazole and L-histidine were eliminated to a satisfactory degree by treating the sample solutions with a metal-chelating resin.
A. Nakano, F. Inagaki, M. Tasumi and T. Miyazawa, J. Chem. Soc., Chem. Commun., 1976, 232 DOI: 10.1039/C39760000232
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