Thermodynamic quantities for the dissociation equilibria of biologically important compounds. 6. The dissociation of calcium glucose 1-phosphate

There is considerable evidence that the calcium salts of many multivalent acids are incompletely dissociated in solution (Martell & Calvin, 1952); among others the dissociation constant of calcium hydrogen phosphate has been measured (Green- wald, Redish & Kibrick, 1940; Davies & Hoyle, 1953). Since glucose 1-phosphate (G1-P) is known to occur in calcifying cartilage (see, for example, McLean & Urist, 1955) it is of interest to obtain detailed information about any interactions between its anions and Ca2+ ions.