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Measurement of solute proton spin‐lattice relaxation times in water using the 1,3,3,1 sequence

1H NMR spin‐lattice relaxation times (T1) of the NCH3 proton resonances of phosphocreatine (PCr) and creatine (Cr) in water solutions were obtained using the 1,3,3,1 pulse sequence. These T1 values were equivalent to those obtained in D2O and water using either the conventional inversion‐recovery experiment or the 1,3,3,1 pulse sequence. Thus, the 1,3,3,1 sequence of proton NMR can provide an independent means along with phosphorous NMR for assess PCr and for the study of the creatine kinase reaction (PCr + ADP ⇌ ATP + Cr) in aqueous solutions and perhaps in biological preparations. © 1986 Academic Press, Inc.