The Ionization equilibria of the amino acids glycine, L-leucine, L-serlne, L-threonlne, L-lyslne, and L-glutamic acid have been studied at 298 K and I = 0.5, 0.3, 0.2, 0.1, 0.05, and 0.025 M. Thermodynamic parameters and the dependence of each protonation constant on Ionic strength have been calculated from the experimental data. The effect of the structure of the amino acids Is also discussed.
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