The enthalpy changes of salting process of hen-egg
white lysozyme in buffer acetate solutions (pH=4.25) as a function of concentration
of following electrolytes: LiCl, KCl, K2SO4,
Li2 SO4 and (NH4)2SO4
are determined. Obtained data according to McMillan and Mayer’s approach,
has been analyzed in the terms of the enthalpic pairwise interaction coefficients:
lysozyme – lysozyme hxx,
and lysozyme – salt hxy.
The ability of cations to precipitate lysozyme solution in relation to the
concentration of cations can be seen from the series as follows: Li+>
The dilution enthalpies of D-mannitol and D-sorbitol in aqueous sodium chloride solution at various concentrations have been determined by isothermal microcalorimetry
at 298.15 K. The homogeneous enthalpic interaction coefficients over a quite large range of concentration of aqueous sodium
chloride solutions have been calculated according to the excess enthalpy concept. The results show that enthalpic pairwise
interaction coefficients (h2) of D-mannitol and D-sorbitol are positive in aqueous sodium chloride solution and become more positive with increase of the concentration of
sodium chloride. The results are interpreted in terms of the different conformations of the two polyols, solute-solute and
solute-solvent interactions involved by solvent effects.
Authors:Y. Li, Z. Yingyuan, L. Yonghui, J. Jing, and W. Xiaoqing
of the examined molecules, respectively.
The value of the heterogeneous enthalpicpairwiseinteractioncoefficient of x molecule with y molecule in aqueous solution is determined on the basis of measurements of mixing enthalpy of aqueous
The enthalpies of dilution
of aqueous solutions for pyridine and methylpyridine isomers have been determined
with a 2277-Thermal Activity Monitor at 298.15 K. The results have been treated
using the excess function concept and homotactic interaction coefficients
have been obtained. The homotactic enthalpic pairwise interaction coefficients
are discussed qualitatively in terms of substitution effects of methyl group
introduced into the pyridine ring.
Authors:Y. Li, H. Xingen, L. Ruisen, and X. Guiying
Enthalpies of dilution of aqueous L-serine, pyridine and methylpyridine solutions and their enthalpies of mixing have been determined by a mixing-flow microcalorimeter
at 298.15 K. The data have been analyzed in terms of McMillan-Mayer formalism to fit to virial polynomials from which the
heterotactic enthalpic pairwise interaction coefficients, hxy, betweenL-serine and pyridine and methylpyridine isomers have been evaluated. The results obtained in the present paper are compared
with those reported in the earlier paper about glycine and L-alanine in the same organic solvent aqueous solutions, giving a global insight of the interaction mechanism between the a-amino
acids and pyridine and methylpyridine from the point of view of solute-solute interactions and substituent effects of methyl
groups introduced into the pyridine ring.