ABSTRACT

Dilution enthalpies of aqueous solutions of 3-amino propanoic acid, 4-amino butanoic acid, 5-amino pentanoic acid, and 6-amino hexanoic acid were determined at T = (293.15, 298.15, 303.15, and 308.15) K using an LKB flow microcalorimeter. The homotactic interaction coefficients were obtained according to the McMillan-Mayer theory from the experimental data. For all the systems studied, the dilution of alpha,omega-amino acids in water is an exothermic process; the pair coefficients have positive values which increases with chain length. The obtained values of the interaction coefficients are interpreted in terms of solute-solvent and solute-solute interactions and are used as indicative of hydrophobic behavior of the amino acid studied.

Compounds

#	Formula	Name
1	C3H7NO2	3-aminopropanoic acid
2	C4H9NO2	4-aminobutanoic acid
3	C5H11NO2	5-aminovaleric acid
4	C6H13NO2	6-aminohexanoic acid
5	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	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	32
POMD	2 5	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	32
POMD	3 5	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	32
POMD	4 5	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	32

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Effect of temperature on the dilution enthalpies of alpha,omega-amino acids in aqueous solutions

Romero, C. M., Cadena, J. C., Lamprecht, I.

ABSTRACT