Water activity in aqueous amino acid solutions, with and without KCl, at 298.15 K

Pinho, Simão

http://hdl.handle.net/10198/2833

Use this identifier to reference this record.

Name:	Description:	Size:	Format:
Thermodynamics2007.pdf		1016.96 KB	Adobe PDF	Download

Send Feedback

Authors

Pinho, Simão

Abstract(s)

The study of physical chemical properties of amino acids (AA) aqueous solutions have been a very important studied subject, not only because they are the basic building blocks of proteins and peptides but also for their importance in industrial processes, particularly for pharmaceutical and food industries. In this work an humidity sensor instrument was used to measure water activity in aqueous solutions of DLalanine, glycine or L-serine with potassium chloride, molality ranging form 0.0 to 3.0. The reliability of the method was checked comparing the experimental data with literature values, proving to be very accurate. The calculated AA molal activity coefficients showed good consistency with those obtained using the isopiestic method, and the ternary data is very useful to extend the capabilities of thermodynamic models to higher salt and AA concentrations.

Keywords

Water activity Electrolyte Amino acids Measurement

URI

http://hdl.handle.net/10198/2833

Citation

Pinho, Simão (2007). Water activity in aqueous amino acid solutions, with and without KCl, at 298.15 K. In International Conference Thermodynamics 2007. Rueil Malmaison