Abstract
31P spin-lattice relaxation times ( T 1) of inorganic orthophosphate, and of the nucleotides TMP, AMP and ATP are reported as a function of pH. The T 1 values are found to exhibit significant pH dependences, with minimum T 1 values generally observed at pH values close to the p K a values for the orthophosphates. The effects of the addition of Cu 2+ or EDTA and treatment with cation exchange resin are described. These observations are related to similar results obtained previously for other ionizing species using 1H and 13C NMR, indicating a general phenomenon of such pH-dependent variations in T 1 values in aqueous solutions. It is suggested that this effect stems from interactions with paramagnetic metal ion impurities.
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