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Authors
Advisor(s)
Abstract(s)
Using a water activity instrument meter, water activity in aqueous solutions of DL-alanine, glycine, or L-serine,
with potassium chloride, molality ranging from 0.0 to 3.0, has been measured at 298.15 K. The reliability
of the method was checked comparing the experimental data with literature values. The method proved to
be accurate, and the water activities measured for water + amino acid systems are reproducible when
compared to the data reported using the isopiestic method. Additionally, a simple theoretical approach applied
to those binary systems enabled the calculation of unsymmetric molal amino acid activity coefficients in
high agreement with the values found using the isopiestic measurements. Finally, the usefulness of the
ternary data to extend the capabilities of thermodynamic models to higher salt and amino acid concentrations
was briefly discussed.
Description
Keywords
Water activity Electrolyte Amino acids Measurement Aqueous solution
Citation
Pinho, Simão (2008). Water activity in aqueous amino acid solutions, with and without KCl, at 298.15 K. Journal of Chemical & Engineering Data. ISSN 1520-5134. 53:1 p.180-184
Publisher
ACS