Fig. 1.

Behaviour of InsP₆ in the presence of calcium. The graphs show the predicted abundances of solid calcium phytate (a, c) and of the sum of the different soluble, 1:1, Ca:InsP₆ complexes (b, d), plotted against total concentrations of InsP₆ (0–5 mM) and Ca²⁺ (0.1–5 mM). The inset in (a) shows a “zoom-in” of the range up to 0.1 mM total InsP₆. Predictions are drawn for pH 7.5 (a, b) and pH 3.0 (c, d), always in 0.15 M NaClO₄ and 37.0 °C. Note that the abundance scales in different parts are different.