ABSTRACT

Enthalpies of dissociation of four isoleucyl dipeptides having alkyl side-chains (l-isoleucine-glycine, l-Ile-Gly; l-isoleucine-l-alanine, l-Ilel- Ala; l-isoleucine-l-valine, l-Ile-l-Val; l-isoleucine-l-isoleucine, l-Ile-l-Ile) in water at 298.15K have been determined. Enthalpies of dilution have also been calculated. These results were used to derive the enthalpic coefficients of interactions according to the modified McMillan Mayer s model. The results are considered in an effort to establish a possible relation between dissociation, intermolecular interactions and the size of the alkyl side-chains.

Compounds

#	Formula	Name
1	C8H16N2O3	L-isoleucylglycine
2	C9H18N2O3	L-isoleucyl-L-alanine
3	C11H22N2O3	L-isoleucyl-L-valine
4	C12H24N2O3	L-isoleucyl-L-isoleucine
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 solution, kJ/mol ; Liquid	Mole fraction - 1; Liquid Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	CALVET:solid	1
POMD	1 5	Molar enthalpy of dilution, kJ/mol ; Liquid	Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	6
POMD	5 2	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 2; Liquid Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	CALVET:solid	1
POMD	5 2	Molar enthalpy of dilution, kJ/mol ; Liquid	Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	8
POMD	5 3	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 3; Liquid Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	CALVET:solid	1
POMD	5 3	Molar enthalpy of dilution, kJ/mol ; Liquid	Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	8
POMD	5 4	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 4; Liquid Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	CALVET:solid	1
POMD	5 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	7

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Influence of isoleucyl dipeptide side-chains on the dissociation and intermolecular interactions in water at 298.15K

Vecchio, S.[Stefano], Antonelli, M. L., Fantauzzi, F., Rodante, F.[Fabrizio], Spadaro, C.

ABSTRACT