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Journal of Solution Chemistry

, Volume 34, Issue 11, pp 1297–1310 | Cite as

Thermodynamic Properties of Peptide Solutions. Part 18. Partial Molar Isentropic Compressibilities of Gly-X-Gly Tripeptides (X = Tyr, Pro, Gln, Asp and Glu), and the Peptide Salts K[GlyAspGly], Na[GlyGluGly] and GlyLysGly Acetate in Aqueous Solution at 25 C

  • Gavin R. Hedwig
  • Harald Høiland
Article

Abstract

The partial molar isentropic compressibilities at infinite dilution, KS,2, have been determined for several tripeptides of the sequence glycyl-X-glycine, where X is one of the amino acids tyrosine, proline, glutamine, aspartic acid, glutamic acid and lysine in aqueous solution at 25 C. These results, along with those for triglycine, were used to estimate the contributions of the amino acid side-chains to the partial molar isentropic compressibilities of polypeptides. Values for KS,2 have also been determined for aqueous solutions of the two peptide salts K[glyaspgly] and Na[glyglugly]. The KS,2 results for the peptides and their salts have been combined with literature data for electrolytes to calculate the changes in isentropic compressibility upon ionization of the acidic side-chains. The results are compared with those for other carboxylic acid systems.

Keywords

Partial molar compressibility speed of sound tripeptide side-chain contributions side-chain ionization aqueous solution 

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Institute of Fundamental Sciences–ChemistryMassey UniversityPalmerston NorthNew Zealand
  2. 2.Department of ChemistryUniversity of BergenBergenNorway

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