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Title: Partial molar adiabatic compressibilities and viscosities of some amino acids in aqueous l,4-dioxane solutions at 298.15 K
Authors: Banipal, T S
Singh, Gagandeep
Issue Date: Jun-2004
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.7 G 01 N
Abstract: Apparent molar adiabatic compressibilities (Ks,2,ϕ) and viscosities (η) of glycine. DL-α-alanine, L-valine, L-leucine and L-phenylalanine have been determined in 2.5, 5.0, 10.0, 20.0 and 25.0 % aqueous 1,4-dioxane solution at 298. 15 K. These data have been used to calculate partial molar adiabatic compressibilities of transfer at infinite dilution (Δtr Kos,2) and viscosity B-coefficients. Positive Δtr Kos,2 values have been observed (except very small negative value for glycine at 2.5 %) for the studied amino acids and their magnitude increases with increase in concentration of 1,4-dioxane. B-coefficient values for the studied amino acids in 1,4-dioxane are higher than the corresponding values in water. The activation energy for viscous flow in aqueous 1,4-dioxane solutions has been calculated from B-coefficient and partial molar volume data reported earlier. Hydration numbers, interaction coefficients and side chain contributions have also been calculated and these results have been discussed in terms of solute-cosolute interactions.
Page(s): 1156-1166
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(06) [June 2004]

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