Solubilities ofL-cystine,L-tyrosine,L-leucine, and glycine in sodium chloride solutions at various pH values

✍ Scribed by Renzo Carta

• Book ID: 102577422
• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 165 KB
• Volume: 30
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.1997.0313

✦ Synopsis

The solubilities of four amino acids L-cystine, L-tyrosine, L-leucine, and glycine at T s 298 K and at the pH values of 0.00, 1.00, 2.00, 11.00, 12.00, and 13.00 in water solutions of sodium Ž chloride, have been measured. The concentration of NaCl was varied from 0.0 to . y3 . 3.0 mol dm . The solubility of L-cystine increased as the concentration of salt was raised . y3 Ž . from 0.0 to 3.0 mol dm . For the same variation of sodium chloride concentration the solubilities of L-tyrosine and L-leucine decreased. The solubility of glycine was not influenced significantly by the presence of NaCl. A simple relation between the ratio of the solubilities of the amino acids with, and without, salt and NaCl concentration is presented. The relation predicts well the solubilities of L-cystine, L-tyrosine, L-leucine, and glycine in aqueous solutions of NaCl starting from known values of the solubilities in pure water.