The Stability Constant of the 1:1 Complex of Sodium with Guanosine 5′-Monophosphate |
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| Authors: | Judith A. Walmsley and Thomas J. Pinnavaia |
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| Abstract: | The stability of the 1:1 complex of sodium ion with the dianion of guanosine 5′-monophosphate has been determined by means of a potentiometric titration employing a specific ion electrode. The stability constant for the reaction Na+ + 5′-GMP2- Na(5′-GMP)- was found to be 2.85 ± 0.36 M-1 at 5°C and an ionic strength of 1.1 ± 0.1 M. Although 5′-GMP forms ordered self-structures at high concentration in the presence of sodium ions, in dilute solution and at low sodium ion concentrations the Na+ binding is weak and typical of that for other nucleotides. |
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