Concentrations of sulfate and bisulfate ions, glycine zwitterions, and glycine cations in aqueous solutions (0.01 to 0.5 M) of TGS were determined by Raman spectroscopy. The results were used to establish differences in the diffusion rates of these ions and to suggest possible influences of these differences on TGS crystal growth experiments to be carried out in Spacelab 3.
S. H. Morgan, E. Silberman, R. L. Kroes, and D. Reiss, "Raman Study of the Diffusion of Triglycine Sulfate in Aqueous Solutions," Appl. Spectrosc. 40, 35-38 (1986)