Water activity in Supersaturated Solutions of Organic Solutes
Han-Soo Na, S. Arnold, and A.S. Myerson
J.Cryst. Growth 149 (1995)

Measurements of water activity in supersaturated aqueous organic solutions of glycine, alanine, succinic acid, and itaconic acid were made far into the metastable zone by levitating micron sized droplets electrodynamically in a spherical void electrodynamic levitator trap (SVELT) with a water vapor reservoir. The concentration dependent behavior of the activity was examined in relationship to the molecular interactions for solutions.