Premium
Measurement and modeling of activities of amino acids in aqueous salt systems
Author(s) -
Khoshkbarchi Mohammad K.,
Vera Juan H.
Publication year - 1996
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690420824
Subject(s) - activity coefficient , aqueous solution , chemistry , thermodynamics , gibbs free energy , ternary operation , electrolyte , amino acid , ternary numeral system , salt (chemistry) , non random two liquid model , organic chemistry , biochemistry , physics , electrode , computer science , programming language , phase (matter)
Activity‐coefficient data were measured for NaCl in the system water–NaCl– DL ‐valine at 25°C. The activity coefficients of DL ‐valine were then calculated through rigorous thermodynamic relations. The activity coefficients of the amino acids in this and other aqueous systems containing electrolytes were modeled using an expression for the excess Gibbs free energy of the solution. The model combines a contribution for long‐range interactions, given either by the Bromley equation or the K‐V equation, and a contribution of short‐range interactions represented by a ternary NRTL or Wilson expression. The model accurately correlates the activity coefficients of ten amino acids in aqueous solutions and of six amino acids in aqueous electrolyte solutions.