Volumetric Properties of Glycine, L-Alanine and L-Serine in Aqueous Urea Solutions at 298.15 K

Abstract

Abstract: Densities of glycine, L-alanine, L-serine in various aqueous urea solutions were measured at 298. 15 Kwith an Anton Paar Model 55 densimeter. From these densities, apparent molar volumes and limited partial molar volumes were calculated, transfer volumes from water to aqueous urea solutions and substituent contributions to the transfer volumes have been obtained. Furthermore, the hydration numbers and volumetric interaction coefficients for the three amino acids were evaluated. Solvent and substituent effects are discussed in detail. The results show that all of the transfer volumes are positive, except alanine in rich-water region, and increase with increasing urea concentration; the side-chain contributions to the transfer volumes are highly related to the nature of side-chain groups; the hydration numbers for the three amino acids in solutions decrease with increasing urea concentration.

Key words: Amino acid, Aqueous urea solutions, Apparent molar volume

CLC Number:

O645.12

TrendMD:

SHAO Shuang, FANG Wen-Jun, LIN Xiao-Mei, LIN Rui-Sen. Volumetric Properties of Glycine, L-Alanine and L-Serine in Aqueous Urea Solutions at 298.15 K[J]. Chem. J. Chinese Universities, 2003, 24(5): 906.

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Volumetric Properties of Glycine, L-Alanine and L-Serine in Aqueous Urea Solutions at 298.15 K

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