310.15 K时蛋白质模型化合物与二元醇在水溶液中的异系焓相互作用

doi:10.3866/PKU.WHXB20100821

Abstract

Abstract:

The enthalpies of mixing for model protein compounds (glycine, alanine, N,N-dimethyl formamide (DMF) and N,N-dimethyl acetamide (DMA)) with diols (1, 3-butanediol and 2, 3-butanediol) and their respective enthalpies of dilution in aqueous solutions at 310.15 K were determined by flow microcalorimetric measurements. Heterotactic enthalpic interaction coefficients (h_xy, h_xxy, h_xyy) were obtained by analyzing these experimental results according to McMillan-Mayer theory. The results indicated that the hxy values were all positive with a dominant endothermic effect and the coefficients decreased according to the order of h_xy(DMA)>h_xy(Ala)>h_xy(Gly)>h_xy(DMF) and h_xy(2,3-butanediol)>h_xy(1,3-butanediol). Based on these results, we discussed solute-solute and solute-solvent interactions with regards to the influence of the relative position of the diol functional groups on the value of hxy. We found that the hydrogen bonds between DMF or DMA and the diols were strong, and because of the good polarizability of DMF's resonance structure, hydrogen bonds between DMF and the diols were further strengthened.

Key words: Amino acid, DMF, DMA, Diol, Solute-solute interaction

MSC2000:

O642

ZHU Yan, PANG Xian-Hong, YU Li. Heterotactic Enthalpy of the Interaction between Protein Model Compounds and Diols in Aqueous Solutions at 310.15 K[J].Acta Phys. -Chim. Sin., 2010, 26(08): 2103-2108.

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Heterotactic Enthalpy of the Interaction between Protein Model Compounds and Diols in Aqueous Solutions at 310.15 K

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