ABSTRACT

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 (?s), change in isentropic compressibility (??s) and relative change (??s/?0) in isentropic compressibility have been computed. The trends in the behaviour of ?s, ??s and ??s/?0 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.

Compounds

#	Formula	Name
1	C3H7NO2	(S)-2-aminopropanoic acid
2	C5H9NO2	L-proline
3	C5H11NO2	L-valine
4	C6H13NO2	L-leucine
5	ClK	potassium chloride
6	KNO3	potassium nitrate
7	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1 5 7	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Linear variable-path acoustic interferometer	48
POMD	1 5 7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Pycnometric method	48
POMD	1 7 6	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Linear variable-path acoustic interferometer	48
POMD	1 7 6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Pycnometric method	48
POMD	2 5 7	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Linear variable-path acoustic interferometer	48
POMD	2 5 7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Pycnometric method	48
POMD	2 7 6	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Linear variable-path acoustic interferometer	48
POMD	2 7 6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Pycnometric method	48
POMD	3 5 7	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Linear variable-path acoustic interferometer	48
POMD	3 5 7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Pycnometric method	48
POMD	3 7 6	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Linear variable-path acoustic interferometer	48
POMD	3 7 6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Pycnometric method	48
POMD	4 5 7	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Linear variable-path acoustic interferometer	48
POMD	4 5 7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Pycnometric method	48
POMD	4 7 6	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Linear variable-path acoustic interferometer	48
POMD	4 7 6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Pycnometric method	48
POMD	5 7	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Linear variable-path acoustic interferometer	6
POMD	5 7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Amount concentration (molarity), mol/dm3 - 5; Liquid	Liquid	Pycnometric method	6
POMD	7 6	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Linear variable-path acoustic interferometer	9
POMD	7 6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Amount concentration (molarity), mol/dm3 - 6; Liquid	Liquid	Pycnometric method	6

Thermodynamics Research Center / ThermoML | Thermochimica Acta

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

Riyazuddeen, Khan, I.[Imran]

ABSTRACT