Abstract
The activity of calcium ions in aqueous solutions of calcium mono-, di-, tri-, and tetra-galacturonates was determined by a spectrophotometric method in which tetramethylmurexide was used as an auxiliary ligand. The concentration of the solutions was 3.00 mequiv./l with respect to [-COOCa 0.5]. In this system, the activity of calcium ions in the solution of calcium galacturonate was very close to that of calcium chloride, while the activity of the calcium ions decreased in a continuous manner with increasing degree of polymerisation of the oligogalacturonate anion. The results are interpreted as evidence that, in calcium pectate, an intramolecular chelate bond of calcium involving two consecutive galacturonic acid units is not very probable.
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