Heterotactic Enthalpic Interaction of Intramolecules in α-Amino Acids-n-Butanol-Water Ternery Systems at 298.15 K

Abstract

Abstract: Mixing and dilution heterotactic enthalpies of aqueous n-butanol solutions and aqueous amino acids(glycine, L-alanine, L-proline, L-valine) solutions were determined at 298.15 K by flow microcalorimetric system of 2277 Thermal Activity Monitor. The data were analyzed by using the McMillan-Mayer theory to obtain the enthalpic interaction coefficients. The interaction between different amino acids and n-butanol molecules has been discussed. It is demonstrated that h_xy values between amino acids and the n-butanol depend on the structure of amino acids. The contributions of different side-groups of amino acids to h_xy are different.The five-membered pyrrole ring of proline have a larger effect on h_xy. The hydrophobicity of n-butanol is much greater than that of urea or monomethylurea.

Key words: Amino acid, n-Butanol, Heterotactic enthalpic interaction

CLC Number:

O645.16⁺4

TrendMD:

ZHU Yan, PANG Xian-Hong, CHENG Xue-Li, YU Li, CAO Xiao-Qun . Heterotactic Enthalpic Interaction of Intramolecules in α-Amino Acids-n-Butanol-Water Ternery Systems at 298.15 K[J]. Chem. J. Chinese Universities, 2004, 25(12): 2312.

References

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