Effect of temperature on volumetric and isentropic compressibility of glycine in aqueous KCl/NaCl solutions

Riyazuddeen, Imran Khan

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Density (ρ) and ultrasonic velocity (u) values of glycine in 1.0 M aqueous KCl and 1.0 M aqueous NaCl solutions have been measured as a function of amino acids concentration at T = (298.15, 303.15, 308.15, 313.15, 318.15 and 323.15) K. Using the ρ and u data, the thermodynamic parameters such as partial molal volume (φ{symbol}0 v), isentropic compressibility (κs), change in isentropic compressibility (Δκs), relative change (Δκs0) in isentropic compressibility and partial molal isentropic compressibility (φ{symbol}0 k), values have been computed. The increase in partial molal volume with temperature is attributed to the volume expansion of hydrated zwitterions. The φ{symbol}0 v and φ{symbol}0 k values of glycine in 1.0 M aqueous KCl and NaCl solutions are larger than the corresponding values in water. The larger partial molal volumes of glycine in 1.0 M aqueous KCl and NaCl is ascribed to the formation of 'zwitterion-K+/Na+/Cl-' and 'K+/Na+/Cl--water dipole' aggregates in solutions. The variation of κs, Δκs and Δκs0 with amino acid/zwitterions concentration and temperature is discussed in terms of zwitterions-ions, zwitterions-water dipoles, ion-ion, ion-water dipoles due to intermolecular/interionic interactions occurring in the systems.

Original languageEnglish
Pages (from-to)57-62
Number of pages6
JournalJournal of Molecular Liquids
Volume152
Issue number1-3
DOIs
Publication statusPublished - Mar 15 2010

Fingerprint

zwitterions
glycine
Compressibility
Glycine
compressibility
Amino acids
Ions
Water
dipoles
water
amino acids
ions
Amino Acids
Ultrasonic velocity
Temperature
temperature
Density (specific gravity)
Thermodynamics
ultrasonics
aqueous solutions

Keywords

  • Isentropic compressibility
  • Partial molal isentropic compressibility
  • Partial molal volume
  • Zwitterion-ion interactions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Effect of temperature on volumetric and isentropic compressibility of glycine in aqueous KCl/NaCl solutions. / Riyazuddeen, ; Khan, Imran.

In: Journal of Molecular Liquids, Vol. 152, No. 1-3, 15.03.2010, p. 57-62.

Research output: Contribution to journalArticle

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