Interactions in l-alanine-/l-proline-/l-valine-/l-leucine-aqueous KCl/KNO3 systems at different temperatures: An isentropic compressibility study

Riyazuddeen*, Imran Khan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Ultrasonic velocity and density values of amino acids: l-alanine/l-proline/l-valine/l-leucine in 2.0 M aqueous KCl and 2.0 M aqueous KNO3 solutions have been measured for several concentrations of amino acids at different temperatures: 298.15, 303.15, 308.15, 313.15, 318.15 and 323.15 K. Using ultrasonic velocity and density data, the thermodynamic parameters such as isentropic compressibility (κs), change in isentropic compressibility (Δκs) and relative change (Δκs0) in isentropic compressibility have been computed. The trends in the behaviour of κs, Δκs and Δκs0 with changes in the concentration of amino acids/zwitterions as well as in temperature have been discussed in terms of zwitterions-ions, zwitterions-water dipoles, ions-ions, ions-water dipoles intermolecular/interionic interactions operative in the said systems.

Original languageEnglish
Pages (from-to)45-48
Number of pages4
JournalThermochimica Acta
Issue number1-2
Publication statusPublished - Feb 10 2009
Externally publishedYes


  • Amino acid
  • Isentropic compressibility
  • KCl
  • KNO
  • Zwitterions-ions interactions

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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