TY - JOUR
T1 - Interactions in l-alanine-/l-proline-/l-valine-/l-leucine-aqueous KCl/KNO3 systems at different temperatures
T2 - An isentropic compressibility study
AU - Riyazuddeen,
AU - Khan, Imran
PY - 2009/2/10
Y1 - 2009/2/10
N2 - 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 (Δκs/κ0) in isentropic compressibility have been computed. The trends in the behaviour of κs, Δκs and Δκs/κ0 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.
AB - 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 (Δκs/κ0) in isentropic compressibility have been computed. The trends in the behaviour of κs, Δκs and Δκs/κ0 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.
KW - Amino acid
KW - Isentropic compressibility
KW - KCl
KW - KNO
KW - Zwitterions-ions interactions
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U2 - 10.1016/j.tca.2008.10.023
DO - 10.1016/j.tca.2008.10.023
M3 - Article
AN - SCOPUS:58249091385
SN - 0040-6031
VL - 483
SP - 45
EP - 48
JO - Thermochimica Acta
JF - Thermochimica Acta
IS - 1-2
ER -