Heterotactic enthalpic interaction of intramolecules in alpha-amino acids-n-butanol-water ternery systems at 298.15 K

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作者单位: Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China Taishan Univ, Dept Chem, Tai An 271021, Peoples R China Taishan Med Coll, Dept Chem & Chem Engn, Tai An 271000, Peoples R China

摘要: 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...更多; 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.收起

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