ABSTRACT

The interactions of glycyl dipeptides (glyglycine, glycyl-L-valine and glycyl-L-leucine) with sodium perfluorooctanoate (SPFO) in aqueous solutions have been investigated by means of density, conductivity, fluorescence spectroscopy, and UV vis spectroscopy. The standard partial molar volume (V 2;/), standard partial molar volume of transfer for dipeptide from water to aqueous SPFO solutions (DtVo), partial molar expansibility (E /) and Hepler s constant have been calculated from density data. Electrical conductivity was used to estimate the critical micellar concentration (ccmc) and the thermodynamic parameters of micellization of SPFO in aqueous glycyl dipeptide solutions. Effects of temperature and hydrocarbon chain length of the glycyl dipeptides on the volumetric properties of dipeptides and critical micelle concentration (ccmc) of SPFO were examined. The pyrene fluorescence spectra were used to study the change of micropolarity produced by the interactions of SPFO with glycyl dipeptides, and the aggregation behaviour of SPFO. From the results of UV-vis absorption spectra, the binding constant between dipeptide and SPFO above the ccmc was determined.

Compounds

#	Formula	Name
1	C4H8N2O3	glycylglycine
2	C7H14N2O3	glycyl-L-valine
3	C8H16N2O3	glycyl-L-leucine
4	C8F15NaO2	sodium perfluorooctanoate
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	5	Mass density, kg/m3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Pycnometric method	1
POMD	1 5	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pycnometric method	10
POMD	2 5	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pycnometric method	11
POMD	3 5	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pycnometric method	10
POMD	4 1 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 4; Liquid	Liquid	Pycnometric method	39
POMD	4 2 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 4; Liquid	Liquid	Pycnometric method	32
POMD	4 3 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 4; Liquid	Liquid	Pycnometric method	44
POMD	4 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 4; Liquid	Liquid	Pycnometric method	4

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Effect of temperature on the interactions of glycyl dipeptides with sodium perfluorooctanoate in aqueous solution: Volumetric, conductometric, and spectroscopic study

Yan, Z.[Zhenning], Liu, R.[Ruili], Wu, S.[Shuangyan], Bai, X.[Xiangru], Wang, J.[Jianji]

ABSTRACT