The Effect of Ammoniun Sulfate on the Solubility of Amino Acids in Water at 298.15 K and 323.15 K

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Luísa A. Ferreira (Author) FEUP; Eugénia A. Macedo (Author) FEUP; Simão P. Pinho (Author) FEUP

Journal

Title: Journal of Chemical Thermodynamics

Vol. 41 No. 2

Pages: 193-196

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge

ISI Web of Science

Scopus

Scientific classification

FOS: Engineering and technology > Chemical engineering

Other information

Abstract (EN): Using the analytical gravimetric method the solubility of glycine, dl-alanine, l-isoleucine, l-threonine, and l-serine in aqueous systems of (NH4)2SO4, at (298.15 and 323.15) K, were measured for salt concentrations ranging up to 2.0 molal. In the electrolyte molality range studied the experimental observations showed that ammonium sulfate is a salting-in agent for most of the amino acids studied. Furthermore, the change of the relative solubility with electrolyte concentration shows a maximum, which makes the representation of the data by a simple empirical correlation such as the Setschenow equation difficult. For the development and evaluation of a robust thermodynamic framework that makes it possible to more profoundly understand aqueous amino acid solutions with ammonium sulfate additional experimental information is needed.

Language: English

Type (Professor's evaluation): Scientific