Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpies of solution of l-threonine in a (water + alcohol) mixture at 298.15K

Smirnov, V. I.[Valeriy I.], Badelin, V. G.[Valentin G.]
Thermochim. Acta 2009, 495, 1-2, 90-94
ABSTRACT
The enthalpies of solution of l-threonine in the (water +methanol), (water + ethanol), (water + npropanol), and (water + i-propanol) mixtures, with an alcohol content up to 0.4 mol fractions, have been measured calorimetrically at T = 298.15K. The standard enthalpies of solution and transfer of l-threonine fromwater to an aqueous alcohol have been calculated. The effect of the structure properties of the mixed solvent on the specified enthalpy characteristics of l-threonine is discussed. The enthalpy coefficients of pairwise interactions between amino acid and alcohol molecules have been computed. It has been found that these coefficients become increasingly positive in the methanol, ethanol, n-propanol, and i-propanol consequence. A comparative analysis of the thermodynamic characteristics of dissolution of l-threonine and some other amino acids (glycine, l-alanine and l-valine) in the mixtures studied has been made.
Compounds
# Formula Name
1 C4H9NO3 L-threonine
2 CH4O methanol
3 C2H6O ethanol
4 C3H8O propan-1-ol
5 C3H8O propan-2-ol
6 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
  • 2
  • 1
  • 6
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 2; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Molality, mol/kg - 1; Liquid
  • Liquid
  • ISOPERIBOL
  • 12
  • POMD
  • 3
  • 1
  • 6
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 3; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Molality, mol/kg - 1; Liquid
  • Liquid
  • ISOPERIBOL
  • 12
  • POMD
  • 4
  • 1
  • 6
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 4; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Molality, mol/kg - 1; Liquid
  • Liquid
  • ISOPERIBOL
  • 12
  • POMD
  • 5
  • 1
  • 6
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 5; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Molality, mol/kg - 1; Liquid
  • Liquid
  • ISOPERIBOL
  • 12