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Abstract
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In this work, the electrolyte, amino acid and water solutions are modeled using activity coefficient (AC)
approach. Two different models, modified Pitzer ion interaction equation proposed by Esteso (PE) and
the Pitzer–Simonson–Clegg model (PSC) are used in their original and modified forms to correlate the
activity coefficient and osmotic coefficient data for binary and ternary systems containing water, amino
acid/peptide and electrolytes. The considered aqueous systems contain one of the eight amino acids:
alanine, glycine, serine, threonine, -alanine, methionine, -amino n-butyric acid and -amino butyric
acid. Also, glycylglycine is used as one peptide. The salts are NaCl, NaBr, NaNO3, KCl and KBr.
The results obtained from the studied models are compared to those of experimental data. The comparison
shows that the PE model can correlate the experimental AC data of ternary systems more accurate
than the other PSC. The equations are tested against the large number (30) of available experimental data
sets.
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