Mutual diffusion coefficients of L-glutamic acid and monosodium L-glutamate in aqueous solutions at T = 298.15 K
Ribeiro, A. C. F.[Ana C. F.], Rodrigo, M. M., Barros, M. C. F.[Marisa C. F.], Verissimo, L. M. P.[Luis M. P.], Romero, C.[Carmen], Valente, A. J. M.[Artur J. M.], Esteso, M. A.[Miguel A.]
Mutual diffusion coefficient values for binary aqueous solutions of both L-glutamic acid (H2Glu) and sodium L-glutamate (NaHGlu) were measured with the Taylor dispersion technique, at T = 298.15 K, and concentrations ranging from (0.001 to 0.100) mol dm 3. The results were discussed on the basis of the Onsager Fuoss and the Nernst theoretical equations, by considering the H2Glu as a weak acid (monoprotic acid, with K2 = 5.62 10 5). The smaller values found for the acid with respect to those of the salt, confirm this association hypothesis. From the diffusion coefficient values at infinitesimal concentration, limiting ionic conductivities as well as the hydrodynamic radius of the hydrogen glutamate ion (HGlu ) were derived and analyzed in terms of the chain methylene groups. The effect of different phenomena, such as association or complexation, were also taken into consideration and discussed. Values for the dissociation degree for H2Glu were also estimated.
Compounds
#
Formula
Name
1
C5H9NO4
L-glutamic acid
2
C5H8NNaO4
sodium (S)-2-amino-4-carboxybutanoate
3
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.