The formation of complexes between phosphocreatine, H2O3PNHC(=NH)N(CH3)CH2CO2H, and the ions Na+, K+ and Mg2+ have been investigated under physiological conditions (aqueous solution, T=37degreesC and I=0.25 mol dm(-3)) by means of P-31 NMR spectroscopy. Only 1:1 complexes have been identified. Stability constants have been determined with the aid of the new computer program HYPNMR-2000. log(10) K values were found to be -0.5(2),-0.3(2) and 1.43(3), respectively. The formation constant for the potassium complex is two orders of magnitude less that the literature value.
Complex formation equilibria of phosphocreatine with sodium, potassium and magnesium ions / F., Cecconi; Frassineti, Chiara; P., Gans; S., Iotti; S., Midollini; A., Sabatini; A., Vacca. - In: POLYHEDRON. - ISSN 0277-5387. - STAMPA. - 21:14-15(2002), pp. 1481-1484. [10.1016/S0277-5387(02)00951-8]
Complex formation equilibria of phosphocreatine with sodium, potassium and magnesium ions
FRASSINETI, Chiara;
2002
Abstract
The formation of complexes between phosphocreatine, H2O3PNHC(=NH)N(CH3)CH2CO2H, and the ions Na+, K+ and Mg2+ have been investigated under physiological conditions (aqueous solution, T=37degreesC and I=0.25 mol dm(-3)) by means of P-31 NMR spectroscopy. Only 1:1 complexes have been identified. Stability constants have been determined with the aid of the new computer program HYPNMR-2000. log(10) K values were found to be -0.5(2),-0.3(2) and 1.43(3), respectively. The formation constant for the potassium complex is two orders of magnitude less that the literature value.
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