Solubility of magnesium salt of 1-aspartic acid

Abstract

Solubility of magnesium hydrogen l-aspartate was examined. This salt is very easily soluble in water but hardly dissolves in organic solvents. In a mixture of water and organic solvents miscible with water, such as methanol, ethanol, propanol, and acetone, the salt distributes between the two layers, forming a dilute solution of the salt in the upper layer and a concentrated solution in the lower layer. The solubility of the slat in the upper layer increases exponentially with the molar fraction of water in the upper layer and the solubility is not affected by temperature. Analysis was carried out on the propanol-water-aspartate system in the upper and lower layers, three-componental phase diagram was prepared, and the Plait point, at which the upper and lower layers agreed, was calculated. It was also found that the exponential function established between the solubility in the upper layer and molar fraction of water thereof is also applicable to the lower layer.